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83867008
|
10.1007/JHEP08(2017)008
|
The $Z$ boson in the process $pp \to ZH$ and the $W^+_{}$ and $W^-_{}$ in the
process $pp \to W^{\pm}_{}H$ can be in polarised states. The polarisation
density matrix of the $Z$ ($W$) boson contains the complete information about a
state of polarisation of the $Z$ ($W$) boson, and $HZZ$, $HZ\gamma$ and $HWW$
interactions may be studied in detail from a careful analysis of these
matrices. In this paper, a systematic approach to analyse these polarisation
density matrices is presented. With the aim of making maximum use of the
polarisation information, all of the elements of the polarisation density
matrices are related with observables, which are measurable at the environment
of $pp$ collisions. Consequences of non-standard $HZZ$, $HZ\gamma$ and $HWW$
interactions for these observables are discussed.Comment: 25 pages, 8 figures, 3 tables. v2; the errors in section 2.3 are
correcte
|
Polarisations of the $Z$ and $W$ bosons in the processes $pp \to ZH$ and
$pp \to W^{\pm}_{}H$
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polarisations of the $z$ and $w$ bosons in the processes $pp \to zh$ and $pp \to w^{\pm}_{}h$
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boson polarised states. polarisation boson polarisation boson gamma careful matrices. analyse polarisation presented. polarisation polarisation observables measurable collisions. consequences gamma observables pages tables. correcte
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non_dup
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[] |
83833613
|
10.1007/JHEP08(2017)009
|
This is the first in a series of papers on the search for the 2D CFT
description of a large class of 4D $\mathcal{N} = 1$ gauge theories. Here, we
identify the 2D CFT symmetry algebra and its representations, namely the
conformal blocks of the Virasoro/W-algebra, that underlie the 2D theory and
reproduce the Seiberg-Witten curves of the $\mathcal{N} = 1$ gauge theories. We
find that the blocks corresponding to the SU(N) $\mathcal{S}_k$ gauge theories
involve fields in certain non-unitary representations of the $W_{kN}$ algebra.
These conformal blocks give a prediction for the instanton partition functions
of the 4D $\mathcal{N} = 1$ SCFTs of class $\mathcal{S}_k$.Comment: 42 pages,5 figure
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2D CFT blocks for the 4D class $\mathcal{S}_k$ theories
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2d cft blocks for the 4d class $\mathcal{s}_k$ theories
|
papers mathcal theories. representations conformal blocks virasoro underlie reproduce seiberg witten mathcal theories. blocks mathcal involve unitary representations algebra. conformal blocks instanton partition mathcal scfts mathcal .comment pages
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non_dup
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[] |
73990704
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10.1007/JHEP08(2017)010
|
Defects in field theories break translation invariance, resulting in the
non-conservation of the energy-momentum tensor in the directions normal to the
defect. This violation is known as the displacement operator. We study 4d
${\cal N}=1$ theories with 3d defects preserving 3d ${\cal N}=1$ supersymmetry
by analyzing the embedding of the 3d superspace in the 4d superspace. We use
this to construct the energy-momentum multiplet of such defect field theories,
which we call the defect multiplet and show how it incorporates the
displacement operator. We also derive the defect multiplet by using a
superspace Noether procedure.Comment: 42 pages, v2: Fixed TeX package problem, v3: Minor correction
|
The energy-momentum multiplet of supersymmetric defect field theories
|
the energy-momentum multiplet of supersymmetric defect field theories
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defects break translation invariance conservation directions defect. violation displacement operator. defects preserving supersymmetry analyzing embedding superspace superspace. multiplet defect call defect multiplet incorporates displacement operator. derive defect multiplet superspace noether pages package minor
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non_dup
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[] |
83865985
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10.1007/JHEP08(2017)011
|
We use brane techniques to study the space of vacua of abelian 3d
$\mathcal{N}=3$ gauge theories. The coordinates on these spaces are the vevs of
chiral monopole and meson operators, which are realized in the type IIB brane
configuration of the theory by adding semi-infinite $(1,k)$ strings or F1
strings. The study of various brane setups allows us to determine a basis of
chiral operators and chiral ring relations relevant to each branch of vacua,
leading to the algebraic description of these branches. The method is mostly
graphical and does not require actual computations. We apply it and provide
explicit results in various examples. For linear quivers we find that the space
of vacua has in general a collection of Coulomb-like branches, a Higgs branch
and mixed branches. For circular quivers we find an extra branch, the geometric
branch, parametrized by monopoles with equal magnetic charges in all $U(1)$
nodes and meson operators. We explain how to include FI and mass deformations.
We also study $\mathcal{N}=3$ theories realized with $(p,q)$ 5-branes.Comment: 78 pages, 41 figure
|
The Space of Vacua of 3d $\mathcal{N}=3$ Abelian Theories
|
the space of vacua of 3d $\mathcal{n}=3$ abelian theories
|
brane vacua abelian mathcal theories. vevs chiral monopole meson realized brane adding infinite strings strings. brane setups chiral chiral branch vacua algebraic branches. mostly graphical computations. examples. quivers vacua coulomb branches branch branches. circular quivers extra branch geometric branch parametrized monopoles charges meson operators. deformations. mathcal realized pages
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non_dup
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84092346
|
10.1007/JHEP08(2017)012
|
Through timelike dualities, one can generate exotic versions of $M$-theory
with different spacetime signatures. These are the $M^*$-theory with signature
$(9,2,-)$, the $M'$-theory, with signature $(6,5,+)$ and the theories with
reversed signatures $(1,10, -)$, $(2,9, +)$ and $(5,6, -)$. In $(s,t, \pm)$,
$s$ is the number of space directions, $t$ the number of time directions, and
$\pm$ refers to the sign of the kinetic term of the $3$ form.
The only irreducible pseudo-riemannian manifolds admitting absolute
parallelism are, besides Lie groups, the seven-sphere $S^7 \equiv SO(8)/SO(7)$
and its pseudo-riemannian version $S^{3,4} \equiv SO(4,4)/SO(3,4)$. [There is
also the complexification $SO(8,\mathbb{C})/SO(7, \mathbb{C})$, but it is of
dimension too high for our considerations.] The seven-sphere $S^7\equiv
S^{7,0}$ has been found to play an important role in $11$-dimensional
supergravity, both through the Freund-Rubin solution and the Englert solution
that uses its remarkable parallelizability to turn on non trivial internal
fluxes. The spacetime manifold is in both cases $AdS_4 \times S^7$. We show
that $S^{3,4}$ enjoys a similar role in $M'$-theory and construct the exotic
form $AdS_4 \times S^{3,4}$ of the Englert solution, with non zero internal
fluxes turned on. There is no analogous solution in $M^*$-theory.Comment: 18 pages, v2: typos fixe
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Timelike duality, $M'$-theory and an exotic form of the Englert solution
|
timelike duality, $m'$-theory and an exotic form of the englert solution
|
timelike dualities exotic versions spacetime signatures. signature signature reversed signatures directions directions refers form. irreducible pseudo riemannian manifolds admitting parallelism besides seven sphere equiv pseudo riemannian equiv complexification mathbb mathbb considerations. seven sphere equiv supergravity freund rubin englert remarkable parallelizability trivial fluxes. spacetime manifold enjoys exotic englert fluxes turned analogous pages typos fixe
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non_dup
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83837335
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10.1007/JHEP08(2017)013
|
This is the second part of two papers where we study the effect of integrable
line defects on bipartite entanglement entropy in integrable field theories. In
this paper, we consider non-topological line defects in Ising field theory. We
derive an infinite series expression for the entanglement entropy and show that
both the UV and IR limits of the bulk entanglement entropy are modified by the
line defect. In the UV limit, we give an infinite series expression for the
coefficient in front of the logarithmic divergence and the exact defect
$g$-function. By tuning the defect to be purely transmissive and reflective, we
recover correctly the entanglement entropy of the bulk and with integrable
boundary.Comment: 30 pages, references added, typos corrected, publication versio
|
Entanglement Entropy in Integrable Field Theories with Line Defects II.
Non-topological Defect
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entanglement entropy in integrable field theories with line defects ii. non-topological defect
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papers integrable defects bipartite entanglement integrable theories. topological defects ising theory. derive infinite entanglement entanglement defect. infinite front logarithmic divergence defect function. tuning defect purely transmissive reflective recover correctly entanglement integrable pages typos corrected publication versio
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83860727
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10.1007/JHEP08(2017)014
|
The worldvolume actions of 3+1 dimensional bosonic branes embedded in a
five-dimensional bulk space can lead to important effective field theories,
such as the DBI conformal Galileons, and may, when the Null Energy Condition is
violated, play an essential role in cosmological theories of the early
universe. These include Galileon Genesis and "bouncing" cosmology, where a
pre-Big Bang contracting phase bounces smoothly to the presently observed
expanding universe. Perhaps the most natural arena for such branes to arise is
within the context of superstring and $M$-theory vacua. Here, not only are
branes required for the consistency of the theory, but, in many cases, the
exact spectrum of particle physics occurs at low energy. However, such theories
have the additional constraint that they must be $N=1$ supersymmetric. This
motivates us to compute the worldvolume actions of $N=1$ supersymmetric
three-branes, first in flat superspace and then to generalize them to $N=1$
supergravitation. In this paper, for simplicity, we begin the process, not
within the context of a superstring vacuum but, rather, for the conformal
Galileons arising on a co-dimension one brane embedded in a maximally symmetric
$AdS_{5}$ bulk space. We proceed to $N=1$ supersymmetrize the associated
worldvolume theory and then generalize the results to $N=1$ supergravity,
opening the door to possible new cosmological scenarios.Comment: 39 pages, 1 figure. Version 4: Typos corrected, minor points on
notation clarifie
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Supergravitational Conformal Galileons
|
supergravitational conformal galileons
|
worldvolume bosonic branes embedded conformal galileons violated cosmological universe. galileon genesis bouncing cosmology bang contracting bounces smoothly presently expanding universe. perhaps arena branes arise superstring vacua. branes consistency energy. supersymmetric. motivates worldvolume supersymmetric branes superspace generalize supergravitation. simplicity begin superstring conformal galileons arising brane embedded maximally space. proceed supersymmetrize worldvolume generalize supergravity opening door cosmological pages figure. typos corrected minor notation clarifie
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83858877
|
10.1007/JHEP08(2017)015
|
Lorentzian continuation of the Sine-Liouville model describes non-homogeneous
rolling closed string tachyon. Via T-duality, this relates to the gauged
$H_+^3$ Wess-Zumino-Witten model at subcritical level. This model is exactly
solvable. We give a closed formula for the 3-point correlation functions for
the model at level k within the range 0<k<2, which relates to the analogous
quantity for k>2 in a similar way as how the Harlow-Maltz-Witten 3-point
function of timelike Liouville field theory relates to the analytic
continuation of the Dorn-Otto-Zamolodchikov-Zamolodchikov structure constants:
We find that the ratio between both 3-point functions can be written in terms
of the Jacobi's $\theta $-function, while their product exhibits remarkable
cancellations and eventually factorizes. Our formula is consistent with
previous proposals made in the literature.Comment: 26 pages. V2 discussion extended. Version to appear in JHE
|
On non-homogeneous tachyon condensation in closed string theory
|
on non-homogeneous tachyon condensation in closed string theory
|
lorentzian continuation sine liouville describes homogeneous rolling tachyon. duality relates gauged wess zumino witten subcritical level. solvable. relates analogous quantity harlow maltz witten timelike liouville relates analytic continuation dorn otto zamolodchikov zamolodchikov jacobi theta exhibits remarkable cancellations eventually factorizes. proposals pages. extended.
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non_dup
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73383423
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10.1007/JHEP08(2017)018
|
Heavy neutrinos with masses below the electroweak scale can simultaneously
generate the light neutrino masses via the seesaw mechanism and the baryon
asymmetry of the universe via leptogenesis. The requirement to explain these
phenomena imposes constraints on the mass spectrum of the heavy neutrinos,
their flavour mixing pattern and their $CP$ properties. We first combine bounds
from different experiments in the past to map the viable parameter regions in
which the minimal low scale seesaw model can explain the observed neutrino
oscillations, while being consistent with the negative results of past searches
for physics beyond the Standard Model. We then study which additional
predictions for the properties of the heavy neutrinos can be made based on the
requirement to explain the observed baryon asymmetry of the universe. Finally,
we comment on the perspectives to find traces of heavy neutrinos in future
experimental searches at the LHC, NA62, BELLE II, T2K, SHiP or a future high
energy collider, such as ILC, CEPC or FCC-ee. If any heavy neutral leptons are
discovered in the future, our results can be used to assess whether these
particles are indeed the common origin of the light neutrino masses and the
baryon asymmetry of the universe. If the magnitude of their couplings to all
Standard Model flavours can be measured individually, and if the Dirac phase in
the lepton mixing matrix is determined in neutrino oscillation experiments,
then all model parameters can in principle be determined from this data. This
makes the low scale seesaw a fully testable model of neutrino masses and
baryogenesis.Comment: We corrected errors in the experimental sensitivities and in the
discussion of the full testability of the model. We also added and updated
plots and references. 37 pages plus appendix, 12 figure
|
Testing the low scale seesaw and leptogenesis
|
testing the low scale seesaw and leptogenesis
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neutrinos electroweak simultaneously seesaw baryon asymmetry universe leptogenesis. requirement phenomena imposes neutrinos flavour properties. combine bounds viable seesaw oscillations searches model. neutrinos requirement baryon asymmetry universe. comment perspectives traces neutrinos searches belle ship collider cepc neutral leptons discovered baryon asymmetry universe. couplings flavours individually dirac lepton oscillation data. seesaw testable corrected sensitivities testability model. updated plots references. pages
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non_dup
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84091498
|
10.1007/JHEP08(2017)019
|
We show how any flavour conserving $Z'$ model can be made flavour violating
and non-universal by introducing mass mixing of quarks and leptons with a
fourth family of vector-like fermions with non-universal $Z'$ couplings. After
developing a general formalism, we focus on two concrete examples, namely a
fermiophobic model, and an $SO(10)$ GUT model, and show how they can account
for the anomalous $B$ decay ratios $R_K$ and $R_{K^*}$. A similar analysis
could be performed for $B-L$ models, $E_6$ models, composite models, and so on.Comment: 21 pages, references added, typos corrected, to appear in JHE
|
Flavourful $Z'$ models for $R_{K^{(*)}}$
|
flavourful $z'$ models for $r_{k^{(*)}}$
|
flavour conserving flavour violating universal introducing quarks leptons fourth fermions universal couplings. formalism concrete fermiophobic anomalous composite pages typos corrected
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non_dup
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83857896
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10.1007/JHEP08(2017)020
|
We calculate the leading contributions to the connected two-point functions
of protected scalar operators in the defect version of N=4 SYM theory which is
dual to the D5-D3 probe-brane system with k units of background gauge field
flux. This involves several types of two-point functions which are vanishing in
the theory without the defect, such as two-point functions of operators of
unequal conformal dimension. We furthermore exploit the operator product
expansion (OPE) and the boundary operator expansion (BOE), which form the basis
of the boundary conformal bootstrap equations, to extract conformal data both
about the defect CFT and about N=4 SYM theory without the defect. From the
knowledge of the one- and two-point functions of the defect theory, we extract
certain structure constants of N=4 SYM theory using the (bulk) OPE and
constrain certain bulk-bulk-to-boundary couplings using the BOE. The extraction
of the former relies on a non-trivial, polynomial k dependence of the one-point
functions, which we explicitly demonstrate. In addition, it requires the
knowledge of the one-point functions of SU$(2)$ descendant operators, which we
likewise explicitly determine.Comment: 34 pages, 2 figure
|
Two-point functions in AdS/dCFT and the boundary conformal bootstrap
equations
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two-point functions in ads/dcft and the boundary conformal bootstrap equations
|
protected defect brane flux. involves vanishing defect unequal conformal dimension. exploit conformal bootstrap extract conformal defect defect. defect extract constrain couplings boe. extraction former relies trivial explicitly demonstrate. descendant likewise explicitly pages
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non_dup
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83860161
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10.1007/JHEP08(2017)021
|
We construct the Lagrangian formulation of massive higher spin on-shell (1,0)
supermultiplets in three dimensional anti-de Sitter space. The construction is
based on description of the massive three dimensional fields in terms of
frame-like gauge invariant formalism and technique of gauge invariant
curvatures. For the two possible massive supermultiplets (s,s+1/2) and
(s,s-1/2) we derive explicit form of the supertransformations leaving the sum
of bosonic and fermionic Lagrangians invariant.Comment: 22 pages, no figures; v2: comments, references and new section added,
26 page
|
Lagrangian description of massive higher spin supermultiplets in AdS_3
space
|
lagrangian description of massive higher spin supermultiplets in ads_3 space
|
lagrangian formulation massive supermultiplets sitter space. massive formalism curvatures. massive supermultiplets derive supertransformations leaving bosonic fermionic lagrangians pages comments
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non_dup
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83864778
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10.1007/JHEP08(2017)022
|
We present the three-loop calculation of the Bremsstrahlung function
associated to the 1/2-BPS cusp in ABJM theory, including color subleading
corrections. Using the BPS condition we reduce the computation to that of a
cusp with vanishing angle. We work within the framework of heavy quark
effective theory (HQET) that further simplifies the analytic evaluation of the
relevant cusp anomalous dimension in the near-BPS limit. The result passes
nontrivial tests, such as exponentiation, and is in agreement with the
conjecture made in [1] for the exact expression of the Bremsstrahlung function,
based on the relation with fermionic latitude Wilson loops.Comment: 46 pages, 15 figure
|
Towards the exact Bremsstrahlung function of ABJM theory
|
towards the exact bremsstrahlung function of abjm theory
|
bremsstrahlung cusp abjm subleading corrections. cusp vanishing angle. hqet simplifies analytic cusp anomalous limit. passes nontrivial exponentiation conjecture bremsstrahlung fermionic latitude wilson pages
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non_dup
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74203497
|
10.1007/JHEP08(2017)023
|
We compute the topologically twisted index for general $\mathcal{N} = 2$
supersymmetric field theories on $\mathbb{H}_2\times S^1$. We also discuss
asymptotically $AdS_4$ magnetically charged black holes with hyperbolic
horizon, in four-dimensional $\mathcal{N} = 2$ gauged supergravity. With
certain assumptions, put forward by Benini, Hristov and Zaffaroni, we find
precise agreement between the black hole entropy and the topologically twisted
index, for $ABJM$ theories.Comment: 39 pp + appendices, v2: references added, typos correcte
|
Microstate Counting of $AdS_4$ Hyperbolic Black Hole Entropy via the
Topologically Twisted Index
|
microstate counting of $ads_4$ hyperbolic black hole entropy via the topologically twisted index
|
topologically twisted mathcal supersymmetric mathbb asymptotically magnetically holes hyperbolic horizon mathcal gauged supergravity. assumptions benini hristov zaffaroni precise topologically twisted abjm appendices typos correcte
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non_dup
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42743914
|
10.1007/JHEP08(2017)025
|
The Weak Gravity Conjecture postulates the existence of superextremal charged
particles, i.e. those with mass smaller than or equal to their charge in Planck
units. We present further evidence for our recent observation that in known
examples a much stronger statement is true: an infinite tower of superextremal
particles of different charges exists. We show that effective Kaluza-Klein
field theories and perturbative string vacua respect the Sublattice Weak
Gravity Conjecture, namely that a finite index sublattice of the full charge
lattice exists with a superextremal particle at each site. In perturbative
string theory we show that this follows from modular invariance. However, we
present counterexamples to the stronger possibility that a superextremal
particle exists at every lattice site, including an example in which the
lightest charged particle is subextremal. The Sublattice Weak Gravity
Conjecture has many implications both for abstract theories of quantum gravity
and for real-world physics. For instance, it implies that if a gauge group with
very small coupling $e$ exists, then the fundamental gravitational cutoff
energy of the theory is no higher than $\sim e^{1/3} M_{\rm Pl}$.Comment: v2: 41 pages, typos fixed, references added, substantial revisions
and clarifications (conclusions unchanged
|
Evidence for a Lattice Weak Gravity Conjecture
|
evidence for a lattice weak gravity conjecture
|
conjecture postulates superextremal i.e. planck units. stronger statement infinite tower superextremal charges exists. kaluza klein perturbative vacua sublattice conjecture sublattice superextremal site. perturbative modular invariance. counterexamples stronger superextremal lightest subextremal. sublattice conjecture physics. gravitational cutoff .comment pages typos substantial revisions clarifications unchanged
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non_dup
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84092889
|
10.1007/JHEP08(2017)027
|
We present measurements of relativistic scaling relations in
$(2+1)$-dimensional conformal fluid turbulence from direct numerical
simulations, in the weakly compressible regime. These relations were
analytically derived previously in Westernacher-Schneider, Lehner, Oz (2015)
for a relativistic fluid; this work is a continuation of that study, providing
further analytical insights together with numerical experiments to test the
scaling relations and extract other important features characterizing the
turbulent behavior. We first explicitly demonstrate that the non-relativistic
limit of these scaling relations reduce to known results from the statistical
theory of incompressible Navier-Stokes turbulence. In simulations of the
inverse-cascade range, we find the relevant relativistic scaling relation is
satisfied to a high degree of accuracy. We observe that the non-relativistic
versions of this scaling relation underperform the relativistic one in both an
absolute and relative sense, with a progressive degradation as the rms Mach
number increases from $0.14$ to $0.19$. In the direct-cascade range, the two
relevant relativistic scaling relations are satisfied with a lower degree of
accuracy in a simulation with rms Mach number $0.11$. We elucidate the poorer
agreement with further simulations of an incompressible Navier-Stokes fluid.
Finally, as has been observed in the incompressible Navier-Stokes case, we show
that the energy spectrum in the inverse-cascade of the conformal fluid exhibits
$k^{-2}$ scaling rather than the Kolmogorov/Kraichnan expectation of
$k^{-5/3}$, and that it is not necessarily associated with compressive effects.
We comment on the implications for a recent calculation of the fractal
dimension of a turbulent $(3+1)$-dimensional AdS black brane.Comment: 18 pages, 10 figures, 1 table. To be submitted to JHEP - comments
welcome. V2 contains a technical edit for the JHEP compiler, as well as minor
grammatical correction
|
Numerical Measurements of Scaling Relations in Two-Dimensional Conformal
Fluid Turbulence
|
numerical measurements of scaling relations in two-dimensional conformal fluid turbulence
|
relativistic conformal turbulence weakly compressible regime. analytically westernacher schneider lehner relativistic continuation insights extract characterizing turbulent behavior. explicitly relativistic incompressible navier stokes turbulence. cascade relativistic satisfied accuracy. relativistic versions underperform relativistic progressive degradation mach cascade relativistic satisfied mach elucidate poorer incompressible navier stokes fluid. incompressible navier stokes cascade conformal exhibits kolmogorov kraichnan expectation necessarily compressive effects. comment fractal turbulent pages table. submitted jhep comments welcome. edit jhep compiler minor grammatical
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83862825
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10.1007/JHEP08(2017)028
|
We calculate loop induced lepton flavor violating Higgs decays in the
Littlest Higgs model with T-parity. We find that a finite amplitude is obtained
only when all contributions from the T-odd lepton sector are included. This is
in contrast to lepton flavor violating processes mediated by gauge bosons where
the partners of the right-handed mirror leptons can be decoupled from the
spectrum. These partners are necessary to cancel the divergence in the Higgs
mass introduced by the mirror leptons but are otherwise unnecessary and assumed
to be decoupled in previous phenomenological studies. Furthermore, as we
emphasize, including the partner leptons in the spectrum also introduces a new
source of lepton flavor violation via their couplings to the physical
pseudo-Goldstone electroweak triplet scalar. Although this extra source also
affects lepton flavor changing gauge transitions, it decouples from these
amplitudes in the limit of heavy mass for the partner leptons. We find that the
corresponding Higgs branching ratio into taus and muons can be as large as
$\sim 0.2 \times 10^{-6}$ for T-odd masses of the order a few TeV, a demanding
challenge even for the high luminosity LHC.Comment: 26 pages, 1 figure. Typos correcte
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Lepton Flavor Changing Higgs decays in the Littlest Higgs Model with
T-parity
|
lepton flavor changing higgs decays in the littlest higgs model with t-parity
|
lepton flavor violating decays littlest parity. lepton included. lepton flavor violating bosons partners handed mirror leptons decoupled spectrum. partners cancel divergence mirror leptons unnecessary decoupled phenomenological studies. emphasize partner leptons introduces lepton flavor violation couplings pseudo goldstone electroweak triplet scalar. extra affects lepton flavor changing decouples amplitudes partner leptons. branching taus muons demanding challenge luminosity pages figure. typos correcte
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non_dup
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83856320
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10.1007/JHEP08(2017)030
|
For three-dimensional ABJ(M) theories and $\mathcal N=4$ Chern-Simons-matter
quiver theories, we construct two sets of 1/2 BPS Wilson loop operators by
applying the Higgsing procedure along independent directions of the moduli
space, and choosing different massive modes. For theories whose dual M-theory
description is known, we also determine the corresponding spectrum of 1/2 BPS
M2-brane solutions. We identify the supercharges in M-theory and field theory,
as well as the supercharges preserved by M2-/anti-M2-branes and 1/2 BPS Wilson
loops. In particular, in $\mathcal N=4$ orbifold ABJM theory we find pairs of
different 1/2 BPS Wilson loops that preserve exactly the same set of
supercharges. In field theory they arise by Higgsing with the choice of either
particles or antiparticles, whereas in the dual description they correspond to
a pair of M2-/anti-M2-branes localized at different positions in the compact
space. This result enlightens the origin of classical Wilson loop degeneracy in
these theories, already discussed in arXiv:1506.07614. A discussion on possible
scenarios that emerge by comparison with localization results is included.Comment: 52 pages, 4 figures; V2, 61 pages, 4 figures, supercharges in gravity
and field theory identified, conclusion unchanged, published versio
|
String theory duals of Wilson loops from Higgsing
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string theory duals of wilson loops from higgsing
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mathcal chern simons quiver wilson higgsing directions moduli choosing massive modes. brane solutions. supercharges supercharges preserved branes wilson loops. mathcal orbifold abjm wilson loops preserve supercharges. arise higgsing antiparticles branes localized space. enlightens wilson degeneracy scenarios emerge localization pages pages supercharges unchanged versio
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73959130
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10.1007/JHEP08(2017)031
|
We discuss electric dipole moments (EDMs) in the framework of CP-violating
natural supersymmetry (SUSY). Recent experimental results have significantly
tightened constraints on the EDMs of electrons and of mercury, and substantial
further progress is expected in the near future. We assess how these results
constrain the parameter space of natural SUSY. In addition to our discussion of
SUSY, we provide a set of general formulas for two-loop fermion EDMs, which can
be applied to a wide range of models of new physics. In the SUSY context, the
two-loop effects of stops and charginos respectively constrain the phases of
$A_t \mu$ and $M_2 \mu$ to be small in the natural part of parameter space. If
the Higgs mass is lifted to 125 GeV by a new tree-level superpotential
interaction and soft term with CP-violating phases, significant EDMs can arise
from the two-loop effects of $W$ bosons and tops. We compare the bounds arising
from EDMs to those from other probes of new physics including colliders, $b \to
s \gamma$, and dark matter searches. Importantly, improvements in reach not
only constrain higher masses, but require the phases to be significantly
smaller in the natural parameter space at low mass. The required smallness of
phases sharpens the CP problem of natural SUSY model building.Comment: 37 pages plus appendices, 16 figures; v2: journal versio
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Electric Dipole Moments in Natural Supersymmetry
|
electric dipole moments in natural supersymmetry
|
dipole moments edms violating supersymmetry susy tightened edms mercury substantial progress future. constrain susy. susy formulas fermion edms physics. susy stops charginos constrain space. lifted superpotential violating edms arise bosons tops. bounds arising edms probes colliders gamma searches. importantly improvements constrain mass. smallness sharpens susy pages appendices versio
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73439221
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10.1007/JHEP08(2017)032
|
We compute the one-loop threshold corrections to the gauge and gravitational
couplings for a large class of N=2 non-K\"ahler heterotic compactifications
with three-form flux, consisting in principal two-torus bundles over K3
surfaces. We obtain the results as sums of BPS-states contributions, depending
on the topological data of the bundle. We analyse also the worldsheet
non-perturbative corrections coming from instantons wrapping the torus fiber,
that are mapped under S-duality to D-instanton corrections in type I flux
compactifications.Comment: 36 page
|
Threshold corrections in heterotic flux compactifications
|
threshold corrections in heterotic flux compactifications
|
gravitational couplings ahler heterotic compactifications consisting principal torus bundles surfaces. sums topological bundle. analyse worldsheet perturbative coming instantons wrapping torus fiber mapped duality instanton
|
non_dup
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[] |
83863313
|
10.1007/JHEP08(2017)033
|
We present a world-sheet formula for all tree level scattering amplitudes, in
all trace sectors, of four dimensional $\mathcal{N} \leq 4$ supersymmetric
Einstein-Yang-Mills theory, based on the refined scattering equations. This
generalizes previously known formulas for all-trace purely bosonic, or
supersymmetric single-trace amplitudes. We find this formula by applying a new
chiral splitting formula for all CHY Pfaffians in 4d, into two determinants, of
positive and negative helicity respectively. The splitting of CHY Pfaffians is
shown to be a special case of the splitting of $T\mathbb{M}$ valued fermion
correlators on the sphere, which does not require the scattering equations to
hold, and is a consequence of the isomorphism $T\mathbb{M} \simeq \mathbb{S}^+
\otimes \mathbb{S}^-$ between the tangent bundle of Minkowski space and the
left- and right-handed spin bundles. We present and prove this general
splitting formula.Comment: 21 page
|
Chiral Splitting and $\mathcal N = 4$ Einstein--Yang--Mills Tree
Amplitudes in 4d
|
chiral splitting and $\mathcal n = 4$ einstein--yang--mills tree amplitudes in 4d
|
sheet amplitudes trace sectors mathcal supersymmetric einstein mills refined equations. generalizes formulas trace purely bosonic supersymmetric trace amplitudes. chiral splitting pfaffians determinants helicity respectively. splitting pfaffians splitting mathbb valued fermion correlators sphere hold isomorphism mathbb simeq mathbb otimes mathbb tangent bundle minkowski handed bundles. splitting
|
non_dup
|
[] |
83858326
|
10.1007/JHEP08(2017)034
|
We propose a generalisation of the Weak Gravity Conjecture in the presence of
scalar fields. The proposal is guided by properties of extremal black holes in
${\cal N}=2$ supergravity, but can be understood more generally in terms of
forbidding towers of stable gravitationally bound states. It amounts to the
statement that there must exist a particle on which the gauge force acts more
strongly than gravity and the scalar forces combined. We also propose that the
scalar force itself should act on this particle stronger than gravity. This
implies that generically the mass of this particle decreases exponentially as a
function of the scalar field expectation value for super-Planckian variations,
which is behaviour predicted by the Refined Swampland Conjecture. In the
context of ${\cal N}=2$ supergravity the Weak Gravity Conjecture bound can be
tied to bounds on scalar field distances in field space. Guided by this, we
present a general proof that for any linear combination of moduli in any
Calabi-Yau compactification of string theory the proper field distance grows at
best logarithmically with the moduli values for super-Planckian distances.Comment: 25 pages. v2: Modified and extended section 4.1. v3: Clarifications
added, published versio
|
The Weak Gravity Conjecture and Scalar Fields
|
the weak gravity conjecture and scalar fields
|
propose generalisation conjecture fields. proposal guided extremal holes supergravity understood forbidding towers gravitationally states. amounts statement acts forces combined. propose stronger gravity. generically exponentially expectation super planckian refined swampland conjecture. supergravity conjecture tied bounds distances space. guided moduli calabi compactification proper grows logarithmically moduli super planckian pages. clarifications versio
|
non_dup
|
[] |
83841439
|
10.1007/JHEP08(2017)036
|
We compute the leading-order evolution of parton distribution functions for
all the Standard Model fermions and bosons up to energy scales far above the
electroweak scale, where electroweak symmetry is restored. Our results include
the 52 PDFs of the unpolarized proton, evolving according to the SU(3), SU(2),
U(1), mixed SU(2) x U(1) and Yukawa interactions. We illustrate the numerical
effects on parton distributions at large energies, and show that this can lead
to important corrections to parton luminosities at a future 100 TeV collider.Comment: 30 pages, 7 figures. Improved treatment of input PDFs at 100 GeV.
Adjusted plotting style to show features more clearly. Main results and
conclusions unchange
|
Standard Model Parton Distributions at Very High Energies
|
standard model parton distributions at very high energies
|
parton fermions bosons electroweak electroweak restored. pdfs unpolarized proton evolving yukawa interactions. illustrate parton parton luminosities pages figures. pdfs gev. adjusted plotting style clearly. unchange
|
non_dup
|
[] |
84092423
|
10.1007/JHEP08(2017)038
|
We study possible applications of artificial neural networks to examine the
string landscape. Since the field of application is rather versatile, we
propose to dynamically evolve these networks via genetic algorithms. This means
that we start from basic building blocks and combine them such that the neural
network performs best for the application we are interested in. We study three
areas in which neural networks can be applied: to classify models according to
a fixed set of (physically) appealing features, to find a concrete realization
for a computation for which the precise algorithm is known in principle but
very tedious to actually implement, and to predict or approximate the outcome
of some involved mathematical computation which performs too inefficient to
apply it, e.g. in model scans within the string landscape. We present simple
examples that arise in string phenomenology for all three types of problems and
discuss how they can be addressed by evolving neural networks from genetic
algorithms.Comment: 17 pages, 7 figures, references added, typos corrected, extended
introductory sectio
|
Evolving neural networks with genetic algorithms to study the String
Landscape
|
evolving neural networks with genetic algorithms to study the string landscape
|
artificial examine landscape. versatile propose dynamically evolve algorithms. blocks combine performs interested classify physically appealing concrete realization precise tedious implement predict approximate mathematical performs inefficient e.g. scans landscape. arise phenomenology addressed evolving pages typos corrected introductory sectio
|
non_dup
|
[] |
83835867
|
10.1007/JHEP08(2017)039
|
We extend kinematic space to a simple scenario where the state is not fixed
by conformal invariance: the vacuum of a conformal field theory with a boundary
(bCFT). We identify the kinematic space associated with the boundary operator
product expansion (bOPE) as a subspace of the full kinematic space. In
addition, we establish representations of the corresponding bOPE blocks in a
dual gravitational description. We show how the new kinematic dictionary and
the dynamical data in bOPE allows one to reconstruct the bulk geometry. This is
evidence that kinematic space may be a useful construction for understanding
bulk physics beyond just kinematics.Comment: 27 pages, 2 figure
|
Boundary Kinematic Space
|
boundary kinematic space
|
extend kinematic conformal invariance conformal bcft kinematic bope subspace kinematic space. establish representations bope blocks gravitational description. kinematic dictionary bope reconstruct geometry. kinematic pages
|
non_dup
|
[] |
83848336
|
10.1007/JHEP08(2017)040
|
Both k-essence and the pressureless perfect fluid develop caustic
singularities at finite time. We further explore the connection between the two
and show that they belong to the same class of models, which admits the caustic
free completion by means of the canonical complex scalar field. Specifically,
the free massive/self-interacting complex scalar reproduces dynamics of
pressureless perfect fluid/shift-symmetric k-essence under certain initial
conditions in the limit of large mass/sharp self-interacting potential. We
elucidate a mechanism of resolving caustic singularities in the complete
picture. The collapse time is promoted to complex number. Hence, the
singularity is not developed in real time. The same conclusion holds for a
collection of collisionless particles modelled by means of the Schroedinger
equation, or ultra-light axions (generically, coherent oscillations of bosons
in the Bose--Einstein condensate state).Comment: 20 pages, 2 figures; clarifications and references added. Matches
published versio
|
Caustic free completion of pressureless perfect fluid and k-essence
|
caustic free completion of pressureless perfect fluid and k-essence
|
essence pressureless perfect caustic singularities time. explore connection belong admits caustic completion canonical field. massive interacting reproduces pressureless perfect essence sharp interacting potential. elucidate resolving caustic singularities picture. collapse promoted number. singularity time. collisionless modelled schroedinger ultra axions generically coherent oscillations bosons bose einstein condensate .comment pages clarifications added. matches versio
|
non_dup
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[] |
84092513
|
10.1007/JHEP08(2017)041
|
We study the entanglement entropy, the R\'enyi entropy, and the mutual
(R\'enyi) information of Dirac fermions on a 2 dimensional torus in the
presence of constant gauge fields. We derive their general formulas using the
equivalence between twisted boundary conditions and the background gauge
fields. Novel and interesting physical consequences have been presented in
arXiv:1705.01859. Here we provide detailed computations of the entropies and
mutual information in a low temperature limit, a large radius limit, and a high
temperature limit. The high temperature limit reveals rather different physical
properties compared to those of the low temperature one: there exist two
non-trivial limits that depend on a modulus parameter and are not smoothly
connected.Comment: 37 pages, v2: some formulas in section 4.3 are correcte
|
Entanglement Entropy with Background Gauge Fields
|
entanglement entropy with background gauge fields
|
entanglement enyi mutual enyi dirac fermions torus fields. derive formulas equivalence twisted fields. consequences computations entropies mutual limit. reveals trivial modulus smoothly pages formulas correcte
|
non_dup
|
[] |
83856227
|
10.1007/JHEP08(2017)042
|
We study the coupling of a 2+1 dimensional non-relativistic spin 1/2 fermion
to a curved Newton-Cartan geometry, using null reduction from an
extra-dimensional relativistic Dirac action in curved spacetime. We analyze
Weyl invariance in detail: we show that at the classical level it is preserved
in an arbitrary curved background, whereas at the quantum level it is broken by
anomalies. We compute the trace anomaly using the Heat Kernel method and we
show that the anomaly coefficients a, c are proportional to the relativistic
ones for a Dirac fermion in 3+1 dimensions. As for the previously studied
scalar case, these coefficents are proportional to 1/m, where m is the
non-relativistic mass of the particle.Comment: 23 page
|
Trace anomaly for non-relativistic fermions
|
trace anomaly for non-relativistic fermions
|
relativistic fermion curved newton cartan extra relativistic dirac curved spacetime. analyze weyl invariance preserved curved broken anomalies. trace anomaly kernel anomaly relativistic dirac fermion dimensions. coefficents relativistic
|
non_dup
|
[] |
83858677
|
10.1007/JHEP08(2017)043
|
We construct supersymmetric AdS_3 solutions in F-theory, that is Type IIB
supergravity with varying axio-dilaton, which are holographically dual to 2d
N=(0,4) superconformal field theories with small superconformal algebra. In
F-theory these arise from D3-branes wrapped on curves in the base of an
elliptically fibered Calabi-Yau threefold Y_3 and correspond to strings in the
6d N=(1,0) theory obtained from F-theory on Y_3. The non-trivial fibration over
the wrapped curves implies a varying coupling of the N=4 Super-Yang-Mills
theory on the D3-branes. We compute the holographic central charges and show
that these agree with the field theory and with the anomalies of self-dual
strings in 6d. We complement our analysis with a discussion of the dual
M-theory solutions and a comparison of the central charges.Comment: 83 pages, v2: references added, typos correcte
|
F-theory and AdS_3/CFT_2
|
f-theory and ads_3/cft_2
|
supersymmetric supergravity axio dilaton holographically superconformal superconformal algebra. arise branes wrapped elliptically fibered calabi threefold strings trivial fibration wrapped super mills branes. holographic charges agree anomalies strings complement pages typos correcte
|
non_dup
|
[] |
73959996
|
10.1007/JHEP08(2017)044
|
For any 4d N=2 SCFT, there is a subsector described by a 2d chiral algebra.
The vacuum character of the chiral algebra reproduces the Schur index of the
corresponding 4d theory. The Macdonald index counts the same set of operators
as the Schur index, but the former has one more fugacity than the latter. We
conjecture a prescription to obtain the Macdonald index from the chiral
algebra. The vacuum module admits a filtration, from which we construct an
associated graded vector space. From this grading, we conjecture a notion of
refined character for the vacuum module of a chiral algebra, which reproduces
the Macdonald index. We test this prescription for the Argyres-Douglas theories
of type $(A_1, A_{2n})$ and $(A_1, D_{2n+1})$ where the chiral algebras are
given by Virasoro and su(2) affine Kac-Moody algebra. When the chiral algebra
has more than one family of generators, our prescription requires a knowledge
of the generators from the 4d.Comment: 25 pages, v2: major revision. Clarified the prescription to get the
Macdonald grading; v3: corrected hyperlinks to the references. To appear in
JHE
|
Macdonald Index and Chiral Algebra
|
macdonald index and chiral algebra
|
scft subsector chiral algebra. character chiral reproduces schur theory. macdonald counts schur former fugacity latter. conjecture prescription macdonald chiral algebra. module admits filtration graded space. grading conjecture notion refined character module chiral reproduces macdonald index. prescription argyres douglas chiral algebras virasoro affine moody algebra. chiral generators prescription generators pages revision. clarified prescription macdonald grading corrected hyperlinks references.
|
non_dup
|
[] |
83862002
|
10.1007/JHEP08(2017)045
|
We compute four-point functions of two heavy and two "perturbatively heavy"
operators in the semiclassical limit of Liouville theory on the sphere. We
obtain these "Heavy-Heavy-Light-Light" (HHLL) correlators to leading order in
the conformal weights of the light insertions in two ways: (a) via a path
integral approach, combining different methods to evaluate correlation
functions from complex solutions for the Liouville field, and (b) via the
conformal block expansion. This latter approach identifies an integral over the
continuum of normalizable states and a sum over an infinite tower of lighter
discrete states, whose contribution we extract by analytically continuing
standard results to our HHLL setting. The sum over this tower reproduces the
sum over those complex saddlepoints of the path integral that contribute to the
correlator. Our path integral computations reveal that when the two light
operators are inserted at equal time in radial quantization, the leading-order
HHLL correlator is independent of their separation, and more generally that at
this order there is no short-distance singularity as the two light operators
approach each other. The conformal block expansion likewise shows that in the
discrete sum short-distance singularities are indeed absent for all
intermediate states that contribute. In particular, the Virasoro vacuum block,
which would have been singular at short distances, is not exchanged. The
separation-independence of equal-time correlators is due to cancelations
between the discrete contributions. These features lead to a Lorentzian
singularity that, in conformal theories with anti-de Sitter (AdS) duals, would
be associated to locality below the AdS scale.Comment: 40 pages, 1 figure; v2: clarifications added, minor typos corrected,
published versio
|
Heavy-Heavy-Light-Light correlators in Liouville theory
|
heavy-heavy-light-light correlators in liouville theory
|
perturbatively semiclassical liouville sphere. hhll correlators conformal weights insertions ways combining liouville conformal expansion. identifies continuum normalizable infinite tower lighter extract analytically continuing hhll setting. tower reproduces saddlepoints correlator. computations reveal inserted quantization hhll correlator singularity other. conformal likewise singularities absent contribute. virasoro singular distances exchanged. independence correlators cancelations contributions. lorentzian singularity conformal sitter duals locality pages clarifications minor typos corrected versio
|
non_dup
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[] |
83867086
|
10.1007/JHEP08(2017)047
|
We apply a formalism accounting for thermal effects (such as modified
Sommerfeld effect; Salpeter correction; decohering scatterings; dissociation of
bound states), to one of the simplest WIMP-like dark matter models, associated
with an "inert" Higgs doublet. A broad temperature range T ~ M/20...M/10^4 is
considered, stressing the importance and less-understood nature of late
annihilation stages. Even though only weak interactions play a role, we find
that resummed real and virtual corrections increase the tree-level overclosure
bound by 1...18%, depending on quartic couplings and mass splittings.Comment: 29 pages. v2: clarifications added, published versio
|
Re-derived overclosure bound for the inert doublet model
|
re-derived overclosure bound for the inert doublet model
|
formalism accounting sommerfeld salpeter decohering scatterings dissociation simplest wimp inert doublet. broad ...m stressing understood annihilation stages. resummed virtual overclosure quartic couplings pages. clarifications versio
|
non_dup
|
[] |
83832425
|
10.1007/JHEP08(2017)048
|
We analyze large logarithmic corrections to 4D black hole entropy and relate
them to the Weyl anomaly. We use duality to show that counter-terms in
Einstein-Maxwell theory can be expressed in terms of geometry alone, with no
dependence on matter terms. We analyze the two known $\mathcal{N} = 2$
supersymmetric invariants for various non-supersymmetric black holes and find
that both reduce to the Euler invariant. The $c$-anomaly therefore vanishes in
these theories and the coefficient of the large logarithms becomes topological.
It is therefore independent of continuous black hole parameters, such as the
mass, even far from extremality.Comment: 29 pages + appendices, 3 table
|
Non-Renormalization For Non-Supersymmetric Black Holes
|
non-renormalization for non-supersymmetric black holes
|
analyze logarithmic relate weyl anomaly. duality counter einstein maxwell terms. analyze mathcal supersymmetric invariants supersymmetric holes euler invariant. anomaly vanishes logarithms topological. pages appendices
|
non_dup
|
[] |
83867515
|
10.1007/JHEP08(2017)049
|
We numerically construct static localized black holes in five and six
spacetime dimensions which are solutions to Einstein's vacuum field equations
with one compact periodic dimension. In particular, we investigate the critical
regime in which the poles of the localized black hole are about to merge. A
well adapted multi-domain pseudo-spectral scheme provides us with accurate
results and enables us to investigate the phase diagram of those localized
solutions within the critical regime, which goes far beyond previous results.
We find that in this regime the phase diagram possesses a spiral structure
adapting to the one recently found for non-uniform black strings. When
approaching the common endpoint of both phases, the behavior of physical
quantities is described by complex critical exponents giving rise to a discrete
scaling symmetry. The numerically obtained values of the critical exponents
agree remarkably well with those derived from the double-cone metric.Comment: Version 4: matched with journal version but fixed a sign error in
equation (16) (accidentally, version 3 does not contain changes compared to
version 2
|
Critical behavior of the black hole / black string transition
|
critical behavior of the black hole / black string transition
|
numerically localized holes spacetime einstein dimension. poles localized merge. adapted pseudo enables localized goes results. possesses spiral adapting strings. approaching endpoint quantities exponents giving symmetry. numerically exponents agree remarkably cone matched accidentally
|
non_dup
|
[] |
83849224
|
10.1007/JHEP08(2017)051
|
We develop a systematic procedure for computing maximal unitarity cuts of
multiloop Feynman integrals in arbitrary dimension. Our approach is based on
the Baikov representation in which the structure of the cuts is particularly
simple. We examine several planar and nonplanar integral topologies and
demonstrate that the maximal cut inherits IBPs and dimension shift identities
satisfied by the uncut integral. Furthermore, for the examples we calculated,
we find that the maximal cut functions from different allowed regions, form the
Wronskian matrix of the differential equations on the maximal cut.Comment: typos corrected, more references adde
|
Maximal Cuts in Arbitrary Dimension
|
maximal cuts in arbitrary dimension
|
maximal unitarity cuts multiloop feynman integrals dimension. baikov cuts simple. examine planar nonplanar topologies maximal inherits ibps identities satisfied uncut integral. maximal wronskian maximal typos corrected adde
|
non_dup
|
[] |
83848819
|
10.1007/JHEP08(2017)053
|
We explore the anomaly-cancellation constraints on simplified dark matter
(DM) models with an extra U(1)$^\prime$ gauge boson $Z'$. We show that, if the
Standard Model (SM) fermions are supplemented by a single DM fermion $\chi$
that is a singlet of the SM gauge group, and the SM quarks have non-zero
U(1)$^\prime$ charges, the SM leptons must also have non-zero U(1)$^\prime$
charges, in which case LHC searches impose strong constraints on the $Z'$ mass.
Moreover, the DM fermion $\chi$ must have a vector-like U(1)$^\prime$ coupling.
If one requires the DM particle to have a purely axial U(1)$^\prime$ coupling,
which would be the case if $\chi$ were a Majorana fermion and would reduce the
impact of direct DM searches, the simplest possibility is that it is
accompanied by one other new singlet fermion, but in this case the
U(1)$^\prime$ charges of the SM leptons still do not vanish. This is also true
in a range of models with multiple new singlet fermions with identical charges.
Searching for a leptophobic model, we then introduce extra fermions that
transform non-trivially under the SM gauge group. We find several such models
if the DM fermion is accompanied by two or more other new fermions with
non-identical charges, which may have interesting experimental signatures. We
present benchmark representatives of the various model classes we discuss.Comment: 19 pages, 0 figures, this v2 matches version accepted for publicatio
|
Anomaly-Free Dark Matter Models are not so Simple
|
anomaly-free dark matter models are not so simple
|
explore anomaly cancellation simplified extra prime boson fermions supplemented fermion singlet quarks prime charges leptons prime charges searches impose mass. fermion prime coupling. purely axial prime majorana fermion searches simplest accompanied singlet fermion prime charges leptons vanish. singlet fermions charges. searching leptophobic extra fermions transform trivially group. fermion accompanied fermions charges signatures. benchmark representatives pages matches publicatio
|
non_dup
|
[] |
84093178
|
10.1007/JHEP08(2017)054
|
The Universal One-Loop Effective Action (UOLEA) is a general expression for
the effective action obtained by evaluating in a model-independent way the
one-loop expansion of a functional path integral. It can be used to match UV
theories to their low-energy EFTs more efficiently by avoiding redundant steps
in the application of functional methods, simplifying the process of obtaining
Wilson coefficients of operators up to dimension six. In addition to loops
involving only heavy fields, matching may require the inclusion of loops
containing both heavy and light particles. Here we use the recently-developed
covariant diagram technique to extend the UOLEA to include heavy-light terms
which retain the same universal structure as the previously-derived heavy-only
terms. As an example of its application, we integrate out a heavy singlet
scalar with a linear coupling to a light doublet Higgs. The extension presented
here is a first step towards completing the UOLEA to incorporate all possible
structures encountered in a covariant derivative expansion of the one-loop path
integral.Comment: 20 pages, 1 figure, 5 tables, 1 Mathematica Noteboo
|
Extending the Universal One-Loop Effective Action: Heavy-Light
Coefficients
|
extending the universal one-loop effective action: heavy-light coefficients
|
universal uolea evaluating integral. match efts efficiently avoiding redundant simplifying obtaining wilson six. loops involving matching inclusion loops particles. covariant extend uolea retain universal terms. integrate singlet doublet higgs. completing uolea incorporate encountered covariant pages tables mathematica noteboo
|
non_dup
|
[] |
154257985
|
10.1007/JHEP08(2017)055
|
A test of lepton universality, performed by measuring the ratio of the branching fractions of the $B \ ^0 \to K \ ^{*0} \mu^+ \mu^-$ and $B \ ^0 \to K \ ^{*0} e^+ e^-$ decays, $R_{K^{∗0}}$, is presented. The $K^{*0}$ meson is reconstructed in the final state $K^+π^−$, which is required to have an invariant mass within $100 \ MeV/c^2$ of the known $K^*(892)^0$ mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of about $3 fb^{−1}$, collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The ratio is measured in two regions of the dilepton invariant mass squared, $q^2$, to be\ud
\ud
$R_{K^{∗0}} = \begin{cases} 0.66_{-0.07}^{+0.11}(stat) \pm0.03(syst) \ for \ 0.045<q^2<1.1GeV^2/c^4, \\ 0.69_{−0.07}^{+0.11}(stat) \pm 0.05(syst) \ for \ 1.1<q^2<6.0GeV^2/c^4. \end{cases}$\ud
\ud
The corresponding 95.4% confidence level intervals are [0.52, 0.89] and [0.53, 0.94]. The results, which represent the most precise measurements of $R_{K^{*0}}$ to date, are compatible with the Standard Model expectations at the level of 2.1–2.3 and 2.4–2.5 standard deviations in the two $q^2$ regions, respectively
|
Test of lepton universality with $B \ ^0 \to K \ ^{*0} \ell^+ \ell^-$ decays
|
test of lepton universality with $b \ ^0 \to k \ ^{*0} \ell^+ \ell^-$ decays
|
lepton universality measuring branching fractions decays presented. meson reconstructed mass. proton proton collision luminosity lhcb tev. dilepton squared begin stat syst stat syst confidence intervals precise compatible expectations deviations
|
non_dup
|
[] |
83849469
|
10.1007/JHEP08(2017)056
|
We study 1+1 dimensional $\phi^4$ theory using the recently proposed method
of conformal truncation. Starting in the UV CFT of free field theory, we
construct a complete basis of states with definite conformal Casimir,
$\mathcal{C}$. We use these states to express the Hamiltonian of the full
interacting theory in lightcone quantization. After truncating to states with
$\mathcal{C} \leq \mathcal{C}_{\max}$, we numerically diagonalize the
Hamiltonian at strong coupling and study the resulting IR dynamics. We compute
non-perturbative spectral densities of several local operators, which are
equivalent to real-time, infinite-volume correlation functions. These spectral
densities, which include the Zamolodchikov $C$-function along the full RG flow,
are calculable at any value of the coupling. Near criticality, our numerical
results reproduce correlation functions in the 2D Ising model.Comment: 31+12 page
|
RG Flow from $\phi^4$ Theory to the 2D Ising Model
|
rg flow from $\phi^4$ theory to the 2d ising model
|
conformal truncation. definite conformal casimir mathcal express interacting lightcone quantization. truncating mathcal mathcal numerically diagonalize dynamics. perturbative densities infinite functions. densities zamolodchikov calculable coupling. criticality reproduce ising
|
non_dup
|
[] |
83857024
|
10.1007/JHEP08(2017)057
|
In this paper, we demonstrate the emergence of nonlinear gravitational
equations directly from the physics of a broad class of conformal field
theories. We consider CFT excited states defined by adding sources for scalar
primary or stress tensor operators to the Euclidean path integral defining the
vacuum state. For these states, we show that up to second order in the sources,
the entanglement entropy for all ball-shaped regions can always be represented
geometrically (via the Ryu-Takayanagi formula) by an asymptotically AdS
geometry. We show that such a geometry necessarily satisfies Einstein's
equations perturbatively up to second order, with a stress energy tensor
arising from matter fields associated with the sourced primary operators. We
make no assumptions about AdS/CFT duality, so our work serves as both a
consistency check for the AdS/CFT correspondence and a direct demonstration
that spacetime and gravitational physics can emerge from the description of
entanglement in conformal field theories.Comment: 55 pages, 8 figure
|
Nonlinear Gravity from Entanglement in Conformal Field Theories
|
nonlinear gravity from entanglement in conformal field theories
|
emergence gravitational broad conformal theories. excited adding euclidean defining state. entanglement ball shaped geometrically takayanagi asymptotically geometry. necessarily satisfies einstein perturbatively arising sourced operators. assumptions duality serves consistency check correspondence demonstration spacetime gravitational emerge entanglement conformal pages
|
non_dup
|
[] |
83839383
|
10.1007/JHEP08(2017)058
|
We study the electroweak baryogenesis in a fermionic dark matter scenario
with a (pseudo)scalar being the mediator in the Higgs portal. It is discussed
that the electroweak phase transition turns to be first-order after taking into
account the role of the (pseudo)scalar in the thermal effective potential in
our extended standard model. Imposing the relic density constraint from the
WMAP/Planck and the bounds from the direct detection experiments XENON100/LUX,
we show that the dark matter scenario with a scalar mediator is hardly capable
of explaining the baryogenesis while the same model with a pseudoscalar
mediator is able to explain the baryon asymmetry. For the latter, we constrain
more the model with {\it Fermi}-LAT upper limit on dark matter annihilation
into $b\bar b$ and $\tau^+\tau^-$. The allowed dark matter mass that leads to
correct relic abundance, renders the electroweak phase transition strongly
first-order, and respects the {\it Fermi}-LAT limit, will be in the range
$110-320$ GeV. The exotic and invisible Higgs decay bounds and the mono-jet
search limit at the LHC do not affect the viable space of parameters.Comment: 15 pages, 4 figures. Fermi-LAT constraint on DM DM to b\bar, tau^+
tau^- in the model was imposed. The range of the mediator mass was shown in a
figure. Published in JHE
|
Electroweak Baryogenesis and Dark Matter via a Pseudoscalar vs. Scalar
|
electroweak baryogenesis and dark matter via a pseudoscalar vs. scalar
|
electroweak baryogenesis fermionic pseudo mediator portal. electroweak turns pseudo model. imposing relic wmap planck bounds xenon mediator hardly capable explaining baryogenesis pseudoscalar mediator baryon asymmetry. constrain fermi annihilation relic abundance renders electroweak respects fermi gev. exotic invisible bounds mono viable pages figures. fermi imposed. mediator figure.
|
non_dup
|
[] |
83854317
|
10.1007/JHEP08(2017)059
|
In this paper we demonstrate, that the light-cone lattice approach for the
Massive-Thirring (sine-Gordon) model, through the quantum inverse scattering
method, admits an appropriate framework for computing the finite volume
form-factors of local operators of the model. In this work we compute the
finite volume diagonal matrix elements of the $U(1)$ conserved current in the
pure soliton sector of the theory. Based on the systematic large volume
expansion of our results, we conjecture an exact expression for the finite
volume expectation values of local operators in pure soliton states. At large
volume in leading order these expectation values have the same form as in
purely elastic scattering theories, but exponentially small corrections differ
from previous Thermodynamic Bethe Ansatz conjectures of purely elastic
scattering theories
|
Lattice approach to finite volume form-factors of the Massive
Thirring/Sine-Gordon model
|
lattice approach to finite volume form-factors of the massive thirring/sine-gordon model
|
cone massive thirring sine gordon admits model. diagonal conserved soliton theory. conjecture expectation soliton states. expectation purely elastic exponentially thermodynamic bethe ansatz conjectures purely elastic
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non_dup
|
[] |
83839410
|
10.1007/JHEP08(2017)060
|
Random tensor networks provide useful models that incorporate various
important features of holographic duality. A tensor network is usually defined
for a fixed graph geometry specified by the connection of tensors. In this
paper, we generalize the random tensor network approach to allow quantum
superposition of different spatial geometries. We set up a framework in which
all possible bulk spatial geometries, characterized by weighted adjacent
matrices of all possible graphs, are mapped to the boundary Hilbert space and
form an overcomplete basis of the boundary. We name such an overcomplete basis
as holographic coherent states. A generic boundary state can be expanded on
this basis, which describes the state as a superposition of different spatial
geometries in the bulk. We discuss how to define distinct classical geometries
and small fluctuations around them. We show that small fluctuations around
classical geometries define "code subspaces" which are mapped to the boundary
Hilbert space isometrically with quantum error correction properties. In
addition, we also show that the overlap between different geometries is
suppressed exponentially as a function of the geometrical difference between
the two geometries. The geometrical difference is measured in an area law
fashion, which is a manifestation of the holographic nature of the states
considered.Comment: 33 pages, 8 figures. An error corrected on page 14. Reference update
|
Holographic coherent states from random tensor networks
|
holographic coherent states from random tensor networks
|
incorporate holographic duality. specified connection tensors. generalize superposition geometries. geometries weighted adjacent mapped hilbert overcomplete boundary. name overcomplete holographic coherent states. generic expanded describes superposition geometries bulk. geometries them. geometries subspaces mapped hilbert isometrically properties. overlap geometries suppressed exponentially geometrical geometries. geometrical fashion manifestation holographic pages figures. corrected update
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non_dup
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[] |
83850857
|
10.1007/JHEP08(2017)061
|
Non-perturbative D-brane instanton effects in 4d N = 1 string
compactifications can be geometrized in terms of a backreacted generalized
geometry. We extend earlier results to setups in which the D-brane instanton is
charged under the 4d gauge symmetries, and show that the backreacted topology
yields the correct charged field theory operators in the 4d effective action.
In type IIA models with D6-branes, the backreaction of D2-brane instantons
forces the recombination of D6-branes, such that the 4d charged field theory
operators arise from basic worldsheet instantons in the backreacted geometry.
We provide large classes of examples of D2-brane instanton effects on
intersecting D6-brane systems in local models mirror to D3-branes at
singularities. The backreacted geometry and the field theory operators are
easily encoded in terms of simple operation in the graphs arising from the
underlying dimer diagrams. This description agrees, in the appropriate cases,
with the complex deformations triggered by certain fractional branes at the
bottom of duality cascades.Comment: 40 pages, 27 Figures,v2 Minor correction
|
Backreacting D-brane instantons on branes at singularities
|
backreacting d-brane instantons on branes at singularities
|
perturbative brane instanton compactifications geometrized backreacted geometry. extend setups brane instanton symmetries backreacted topology action. branes backreaction brane instantons forces recombination branes arise worldsheet instantons backreacted geometry. brane instanton intersecting brane mirror branes singularities. backreacted encoded arising dimer diagrams. agrees deformations triggered fractional branes duality pages minor
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non_dup
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[] |
73960986
|
10.1007/JHEP08(2017)062
|
Perturbative series of some quantities in quantum field theories, such as the
pole mass of a quark, suffer from a kind of divergence called renormalon
divergence. In this paper, the leading renormalon in the pole mass is
investigated, and a map is introduced to suppress this renormalon. The inverse
of the map is then used to generate the leading renormalon and obtain an
expression to calculate its overall normalization. Finally, the overall
normalization of the leading renormalon of the pole mass is calculated for
several values of quark flavors.Comment: The published version; speculations about higher order renormalons
are remove
|
A discussion on leading renormalon in the pole mass
|
a discussion on leading renormalon in the pole mass
|
perturbative quantities pole suffer kind divergence renormalon divergence. renormalon pole suppress renormalon. renormalon normalization. normalization renormalon pole speculations renormalons remove
|
non_dup
|
[] |
73417515
|
10.1007/JHEP08(2017)063
|
We study the geometric description of BPS states in supersymmetric theories
with eight supercharges in terms of geodesic networks on suitable spectral
curves. We lift and extend several constructions of Gaiotto-Moore-Neitzke from
gauge theory to local Calabi-Yau threefolds and related models. The
differential is multi-valued on the covering curve and features a new type of
logarithmic singularity in order to account for D0-branes and non-compact
D4-branes, respectively. We describe local rules for the three-way junctions of
BPS trajectories relative to a particular framing of the curve. We reproduce
BPS quivers of local geometries and illustrate the wall-crossing of finite-mass
bound states in several new examples. We describe first steps toward
understanding the spectrum of framed BPS states in terms of such "exponential
networks."Comment: 82 pages, 60 figures, typos fixe
|
Exponential Networks and Representations of Quivers
|
exponential networks and representations of quivers
|
geometric supersymmetric eight supercharges geodesic curves. lift extend constructions gaiotto moore neitzke calabi threefolds models. valued covering logarithmic singularity branes branes respectively. junctions trajectories framing curve. reproduce quivers geometries illustrate crossing examples. toward framed exponential networks. comment pages typos fixe
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non_dup
|
[] |
83857565
|
10.1007/JHEP08(2017)064
|
What is the dynamics of heavy quarks and antiquarks in a quark gluon plasma?
Can heavy-quark bound states dissociate? Can they (re)combine? These questions
are addressed by investigating a Lindblad equation that describes the quantum
dynamics of the heavy quarks in a medium. The Lindblad equations for a heavy
quark and a heavy quark-antiquark pair are derived from the gauge theory,
following a chain of well-defined approximations. In this work the case of an
abelian plasma has been considered, but the extension to the non-abelian case
is feasible. A one-dimensional simulation of the Lindblad equation is performed
to extract information about bound-state dissociation, recombination and
quantum decoherence for a heavy quark-antiquark pair. All these phenomena are
found to depend strongly on the imaginary part of the inter-quark potential.Comment: 50 pages, 10 figures - added references - corrected typos and added a
few comments - added appendix
|
Fate of in-medium heavy quarks via a Lindblad equation
|
fate of in-medium heavy quarks via a lindblad equation
|
quarks antiquarks gluon dissociate combine addressed investigating lindblad describes quarks medium. lindblad antiquark approximations. abelian abelian feasible. lindblad extract dissociation recombination decoherence antiquark pair. phenomena imaginary pages corrected typos comments
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non_dup
|
[] |
73988696
|
10.1007/JHEP08(2017)066
|
Using supersymmetric localization, we consider four-dimensional
$\mathcal{N}=2$ superconformal quiver gauge theories obtained from
$\mathbb{Z}_n$ orbifolds of $\mathcal{N}=4$ Super Yang-Mills theory in the
large $N$ limit at weak coupling. In particular, we show that: 1) The partition
function for arbitrary couplings can be constructed in terms of universal
building blocks. 2) It can be computed in perturbation series, which converges
uniformly for $|\lambda_I|<\pi^2$, where $\lambda_I$ are the 't Hooft coupling
of the gauge groups. 3) The perturbation series for two-point functions can be
explicitly computed to arbitrary orders. There is no universal effective
coupling by which one can express them in terms of correlators of the
$\mathcal{N}=4$ theory. 4) One can define twisted and untwisted sector
operators. At the perturbative orbifold point, when all the couplings are the
same, the correlators of untwisted sector operators coincide with those of
$\mathcal{N}=4$ Super Yang-Mills theory. In the twisted sector, we find
remarkable cancellations of a certain number of planar loops, determined by the
conformal dimension of the operator
|
Large $N$ correlation functions in $\mathcal{N}=2$ superconformal
quivers
|
large $n$ correlation functions in $\mathcal{n}=2$ superconformal quivers
|
supersymmetric localization mathcal superconformal quiver mathbb orbifolds mathcal super mills coupling. partition couplings universal blocks. perturbation converges uniformly lambda lambda hooft groups. perturbation explicitly orders. universal express correlators mathcal theory. twisted untwisted operators. perturbative orbifold couplings correlators untwisted coincide mathcal super mills theory. twisted remarkable cancellations planar loops conformal
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non_dup
|
[] |
83837466
|
10.1007/JHEP08(2017)067
|
We consider two-dimensional chiral, first-order conformal field theories
governing maps from the Riemann sphere to the projective light cone inside
Minkowski space -- the natural setting for describing conformal field theories
in two fewer dimensions. These theories have a SL(2) algebra of local bosonic
constraints which can be supplemented by additional fermionic constraints
depending on the matter content of the theory. By computing the BRST charge
associated with gauge fixing these constraints, we find anomalies which vanish
for specific target space dimensions. These critical dimensions coincide
precisely with those for which (biadjoint) cubic scalar theory, gauge theory
and gravity are classically conformally invariant. Furthermore, the BRST
cohomology of each theory contains vertex operators for the full conformal
multiplets of single field insertions in each of these space-time CFTs. We give
a prescription for the computation of three-point functions, and compare our
formalism with the scattering equations approach to on-shell amplitudes.Comment: 34 pages, no figures. v2: typos corrected and some comments added;
v3: published versio
|
Space-time CFTs from the Riemann sphere
|
space-time cfts from the riemann sphere
|
chiral conformal governing riemann sphere projective cone minkowski describing conformal fewer dimensions. bosonic supplemented fermionic theory. brst fixing anomalies vanish dimensions. coincide precisely biadjoint cubic classically conformally invariant. brst cohomology conformal multiplets insertions cfts. prescription formalism pages figures. typos corrected comments versio
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non_dup
|
[] |
83841910
|
10.1007/JHEP08(2017)070
|
We study asymptotic safety of models of the higher derivative quantum gravity
with and without matter. The beta functions are derived by utilizing the
functional renormalization group, and non-trivial fixed points are found. It
turns out that all couplings in gravity sector, namely the cosmological
constant, the Newton constant, and the $R^2$ and $R_{\mu\nu}^2$ coupling
constants, are relevant in case of higher derivative pure gravity. For the
Higgs-Yukawa model non-minimal coupled with higher derivative gravity, we find
a stable fixed point at which the scalar-quartic and the Yukawa coupling
constants become relevant. The relevant Yukawa coupling is crucial to realize
the finite value of the Yukawa coupling constants in the standard model.Comment: Version published in JHEP; 75 pages, 10 figures, typos corrected,
references adde
|
Asymptotic safety of higher derivative quantum gravity non-minimally
coupled with a matter system
|
asymptotic safety of higher derivative quantum gravity non-minimally coupled with a matter system
|
asymptotic matter. beta utilizing renormalization trivial found. turns couplings cosmological newton gravity. yukawa quartic yukawa relevant. yukawa crucial realize yukawa jhep pages typos corrected adde
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non_dup
|
[] |
84330318
|
10.1007/JHEP08(2017)071
|
We study the quantum spectral curve of the Argyres-Douglas theories in the
Nekrasov-Sahashvili limit of the Omega-background. Using the ODE/IM
correspondence we investigate the quantum integrable model corresponding to the
quantum spectral curve. We show that the models for the $A_{2N}$-type theories
are non-unitary coset models $(A_1)_1\times (A_1)_{L}/(A_1)_{L+1}$ at the
fractional level $L=\frac{2}{2N+1}-2$, which appear in the study of the 4d/2d
correspondence of ${\cal N}=2$ superconformal field theories. Based on the WKB
analysis, we clarify the relation between the Y-functions and the quantum
periods and study the exact Bohr-Sommerfeld quantization condition for the
quantum periods. We also discuss the quantum spectral curves for the D and E
type theories.Comment: 28 pages, 1 figure. Typos corrected, a reference is added. Published
versio
|
ODE/IM correspondence and the Argyres-Douglas theory
|
ode/im correspondence and the argyres-douglas theory
|
argyres douglas nekrasov sahashvili omega background. correspondence integrable curve. unitary coset fractional frac correspondence superconformal theories. clarify bohr sommerfeld quantization periods. pages figure. typos corrected added. versio
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non_dup
|
[] |
83843332
|
10.1007/JHEP08(2017)072
|
We study dark matter physics in the Minimal Supersymmetric Standard Model
with non-universal gaugino masses at the unification scale. In this scenario,
the specific ratio of wino and gluino masses realizes the electro-weak scale
naturally and achieves 125 GeV Higgs boson mass. Then, relatively light
higgsino is predicted and the lightest neutral particle, that is dominantly
given by the neutral component of higgsino, is a good dark matter candidate.
The direct detection of the dark matter is sensitive to not only a higgsino
mass but also gaugino masses significantly. The upcoming XENON1T experiment
excludes the parameter region where bino or gluino is lighter than about 2.5
TeV if the higgsino and the gaugino mass parameters have same signs. We see
that the direct detection of dark matter gives stronger bound than the direct
search at the LHC experiment when higgsino sizably contributes to the dark
matter abundanceComment: 21 pages, 5 figures, 1 tabl
|
Study of dark matter physics in non-universal gaugino mass scenario
|
study of dark matter physics in non-universal gaugino mass scenario
|
supersymmetric universal gaugino unification scale. wino gluino realizes electro naturally achieves boson mass. higgsino lightest neutral dominantly neutral higgsino candidate. higgsino gaugino significantly. upcoming xenon excludes bino gluino lighter higgsino gaugino signs. stronger higgsino sizably contributes abundancecomment pages tabl
|
non_dup
|
[] |
83845705
|
10.1007/JHEP08(2017)074
|
The usage of Effective Field Theories (EFT) for LHC new physics searches is
receiving increasing attention. It is thus important to clarify all the aspects
related with the applicability of the EFT formalism in the LHC environment,
where the large available energy can produce reactions that overcome the
maximal range of validity, i.e. the cutoff, of the theory. We show that this
does forbid to set rigorous limits on the EFT parameter space through a
modified version of the ordinary binned likelihood hypothesis test, which we
design and validate. Our limit-setting strategy can be carried on in its
full-fledged form by the LHC experimental collaborations, or performed
externally to the collaborations, through the Simplified Likelihood approach,
by relying on certain approximations. We apply it to the recent CMS mono-jet
analysis and derive limits on a Dark Matter (DM) EFT model. DM is selected as a
case study because the limited reach on the DM production EFT Wilson
coefficient and the structure of the theory suggests that the cutoff might be
dangerously low, well within the LHC reach. However our strategy can also be
applied to EFT's parametrising the indirect effects of heavy new physics in the
Electroweak and Higgs sectors
|
Setting limits on Effective Field Theories: the case of Dark Matter
|
setting limits on effective field theories: the case of dark matter
|
usage searches receiving attention. clarify applicability formalism overcome maximal validity i.e. cutoff theory. forbid rigorous ordinary binned likelihood validate. fledged collaborations externally collaborations simplified likelihood relying approximations. mono derive model. wilson cutoff dangerously reach. parametrising indirect electroweak sectors
|
non_dup
|
[] |
73414365
|
10.1007/JHEP08(2017)075
|
We consider the late time behavior of the analytically continued partition
function $Z(\beta + it) Z(\beta - it)$ in holographic $2d$ CFTs. This is a
probe of information loss in such theories and in their holographic duals. We
show that each Virasoro character decays in time, and so information is not
restored at the level of individual characters. We identify a universal
decaying contribution at late times, and conjecture that it describes the
behavior of generic chaotic $2d$ CFTs out to times that are exponentially large
in the central charge. It was recently suggested that at sufficiently late
times one expects a crossover to random matrix behavior. We estimate an upper
bound on the crossover time, which suggests that the decay is followed by a
parametrically long period of late time growth. Finally, we discuss integrable
theories and show how information is restored at late times by a series of
characters. This hints at a possible bulk mechanism, where information is
restored by an infinite sum over non-perturbative saddles.Comment: 36 pages, 7 figure
|
2D CFT Partition Functions at Late Times
|
2d cft partition functions at late times
|
analytically continued partition beta beta holographic cfts. holographic duals. virasoro character decays restored characters. universal decaying conjecture describes generic chaotic cfts exponentially charge. sufficiently expects crossover behavior. crossover parametrically growth. integrable restored characters. hints restored infinite perturbative pages
|
non_dup
|
[] |
73440991
|
10.1007/JHEP08(2017)076
|
Very high multiplicity, spherically-symmetric distributions of soft
particles, with $p_T$ ~ few hundred MeV, may be a signature of strongly-coupled
hidden valleys that exhibit long, efficient showering windows. With traditional
triggers, such "soft bomb" events closely resemble pile-up and are therefore
only recorded with minimum bias triggers at a very low efficiency. We
demonstrate a proof-of-concept for a high-level triggering strategy that
efficiently separates soft bombs from pile-up by searching for a "belt of
fire": A high density band of hits on the innermost layer of the tracker.
Seeding our proposed high-level trigger with existing jet, missing transverse
energy or lepton hardware-level triggers, we show that net trigger efficiencies
of order 10% are possible for bombs of mass several hundred GeV. We also
consider the special case that soft bombs are the result of an exotic decay of
the 125 GeV Higgs. The fiducial rate for "Higgs bombs" triggered in this manner
is marginally higher than the rate achievable by triggering directly on a hard
muon from associated Higgs production.Comment: 38 pages, 5 tables, 14 figure
|
Triggering Soft Bombs at the LHC
|
triggering soft bombs at the lhc
|
multiplicity spherically hundred signature hidden valleys exhibit showering windows. traditional triggers bomb closely resemble pile triggers efficiency. triggering efficiently separates bombs pile searching belt fire hits innermost tracker. seeding trigger missing lepton hardware triggers trigger efficiencies bombs hundred gev. bombs exotic higgs. fiducial bombs triggered manner marginally achievable triggering muon pages tables
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non_dup
|
[] |
84090779
|
10.1007/JHEP08(2017)078
|
We explore the phenomenology of Elastically Decoupling Relic (ELDER) dark
matter. ELDER is a thermal relic whose present density is determined primarily
by the cross-section of its elastic scattering off Standard Model (SM)
particles. Assuming that this scattering is mediated by a kinetically mixed
dark photon, we argue that the ELDER scenario makes robust predictions for
electron-recoil direct-detection experiments, as well as for dark photon
searches. These predictions are independent of the details of interactions
within the dark sector. Together with the closely related Strongly-Interacting
Massive Particle (SIMP) scenario, the ELDER predictions provide a physically
motivated, well-defined target region, which will be almost entirely accessible
to the next generation of searches for sub-GeV dark matter and dark photons. We
provide useful analytic approximations for various quantities of interest in
the ELDER scenario, and discuss two simple renormalizable toy models which
incorporate the required strong number-changing interactions among the ELDERs,
as well as explicitly implement the coupling to electrons via the dark photon
portal.Comment: 31 pages, 6 figures, minor corrections, updates to match version
published in JHE
|
Phenomenology of ELDER Dark Matter
|
phenomenology of elder dark matter
|
explore phenomenology elastically decoupling relic elder matter. elder relic primarily elastic particles. kinetically argue elder robust recoil searches. sector. closely interacting massive simp elder physically motivated entirely accessible searches photons. analytic approximations quantities elder renormalizable incorporate changing elders explicitly implement pages minor updates match
|
non_dup
|
[] |
83862470
|
10.1007/JHEP08(2017)079
|
In this paper, we extend our previous work to construct (0,2) Toda-like
mirrors to A/2-twisted theories on more general spaces, as part of a program of
understanding (0,2) mirror symmetry. Specifically, we propose (0,2) mirrors to
GLSMs on toric del Pezzo surfaces and Hirzebruch surfaces with deformations of
the tangent bundle. We check the results by comparing correlation functions,
global symmetries, as well as geometric blowdowns with the corresponding (0,2)
Toda-like mirrors. We also briefly discuss Grassmannian manifolds.Comment: 49 pages, LaTeX; v2: references adde
|
More Toda-like (0,2) mirrors
|
more toda-like (0,2) mirrors
|
extend toda mirrors twisted mirror symmetry. propose mirrors glsms toric pezzo hirzebruch deformations tangent bundle. check symmetries geometric blowdowns toda mirrors. briefly grassmannian pages latex adde
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non_dup
|
[] |
83859388
|
10.1007/JHEP08(2017)081
|
Building on [1], we examine a holographic model in which a U(1) symmetry and
translational invariance are broken spontaneously at the same time. The
symmetry breaking is realized through the St\"{u}ckelberg mechanism, and leads
to a scalar condensate and a charge density which are spatially modulated and
exhibit unidirectional stripe order. Depending on the choice of parameters, the
oscillations of the scalar condensate can average out to zero, with a frequency
which is half of that of the charge density. In this case the system realizes
some of the key features of pair density wave order. The model also admits a
phase with co-existing superconducting and charge density wave orders, in which
the scalar condensate has a uniform component. In our construction the various
orders are intertwined with each other and have a common origin. The fully
backreacted geometry is computed numerically, including for the case in which
the theory contains axions. The latter can be added to explicitly break
translational symmetry and mimic lattice-type effects.Comment: 37 pages, 17 figure
|
Intertwined Orders in Holography: Pair and Charge Density Waves
|
intertwined orders in holography: pair and charge density waves
|
examine holographic translational invariance broken spontaneously time. breaking realized ckelberg condensate spatially modulated exhibit unidirectional stripe order. oscillations condensate density. realizes order. admits superconducting orders condensate component. orders intertwined origin. backreacted numerically axions. explicitly break translational mimic pages
|
non_dup
|
[] |
83855552
|
10.1007/JHEP08(2017)083
|
We study large $N$ tensor models on the lattice without disorder. We
introduce techniques which can be applied to a wide class of models, and
illustrate it by studying some specific rank-3 tensor models. In particular, we
study Klebanov-Tarnopolsky model on lattice, Gurau-Witten model (by treating it
as a tensor model on four sites) and also a new model which interpolates
between these two models. In each model, we evaluate various four point
functions at large $N$ and strong coupling, and discuss their spectrum and long
time behaviors. We find similarities as well as differences from SYK model. We
also generalize our analysis to rank-$D$ tensor models where we obtain
analogous results as $D=3$ case for the four point functions which we computed.
For $D>5$, we are able to compute the next-to-subleading ${1 \over N}$
corrections for a specific four point function.Comment: 46 pages, 29 figures; v2:typos corrected, reference added; v3:minor
revisions, to be published in JHE
|
SYK-like Tensor Models on the Lattice
|
syk-like tensor models on the lattice
|
disorder. illustrate studying models. klebanov tarnopolsky gurau witten treating interpolates models. behaviors. similarities model. generalize analogous computed. subleading pages typos corrected minor revisions
|
non_dup
|
[] |
83865963
|
10.1007/JHEP08(2017)084
|
Two-dimensional conformal field theories at large central charge and with a
sufficiently sparse spectrum of light states have been shown to exhibit
universal thermodynamics. This thermodynamics matches that of AdS$_3$ gravity,
with a Hawking-Page transition between thermal AdS and the BTZ black hole. We
extend these results to correlation functions of light operators. Upon making
some additional assumptions, such as large $c$ factorization of correlators, we
establish that the thermal AdS and BTZ solutions emerge as the universal
backgrounds for the computation of correlators. In particular, Witten diagrams
computed on these backgrounds yield the CFT correlators, order by order in a
large $c$ expansion, with exponentially small corrections. In pure CFT terms,
our result is that thermal correlators of light operators are determined
entirely by light spectrum data. Our analysis is based on the constraints of
modular invariance applied to the torus two-point function.Comment: 18 pages. v2: minor edit
|
Black holes from CFT: Universality of correlators at large c
|
black holes from cft: universality of correlators at large c
|
conformal sufficiently sparse exhibit universal thermodynamics. thermodynamics matches hawking hole. extend operators. assumptions factorization correlators establish emerge universal backgrounds correlators. witten diagrams backgrounds correlators exponentially corrections. correlators entirely data. modular invariance torus pages. minor edit
|
non_dup
|
[] |
83853249
|
10.1007/JHEP08(2017)085
|
We develop a formalism where the hard and soft pomeron contributions to high
energy scattering arise as leading Regge poles of a single kernel in
holographic QCD. The kernel is obtained using effective field theory inspired
by Regge theory of a 5-d string theory. It describes the exchange of higher
spin fields in the graviton Regge trajectory that are dual to glueball states
of twist two. For a specific holographic QCD model we describe Deep Inelastic
Scattering in the Regge limit of low Bjorken x, finding good agreement with
experimental data from HERA. The observed rise of the effective pomeron
intercept, as the size of the probe decreases, is reproduced by considering the
first four pomeron trajectories. In the case of soft probes, relevant to total
cross sections, the leading hard pomeron trajectory is suppressed, such that in
this kinematical region we reproduce an intercept of 1.09 compatible with the
QCD soft pomeron data. In the spectral region of positive Maldelstam variable t
the first two pomeron trajectories are consistent with current expectations for
the glueball spectrum from lattice simulations
|
Unity of pomerons from gauge/string duality
|
unity of pomerons from gauge/string duality
|
formalism pomeron arise regge poles kernel holographic qcd. kernel inspired regge theory. describes graviton regge trajectory glueball twist two. holographic inelastic regge bjorken hera. pomeron intercept reproduced pomeron trajectories. probes pomeron trajectory suppressed kinematical reproduce intercept compatible pomeron data. maldelstam pomeron trajectories expectations glueball
|
non_dup
|
[] |
83860255
|
10.1007/JHEP08(2017)087
|
According to the horizon fluff proposal microstates of a generic black hole
belong to a certain subset of near horizon soft hairs that cannot be extended
beyond the near horizon region. In [1,2] it was shown how the horizon fluff
proposal works for AdS3 black holes. In this work we clarify further this
picture by showing that BTZ black hole microstates are in general among the
coherent states in the Hilbert space associated with conic spaces or their
Virasoro descendants, provided we impose a (Bohr-type) quantization condition
on the angular deficit. Thus BTZ black holes may be viewed as condensates (or
solitonic states) of AdS3 particles. We provide canonical and microcanonical
descriptions of the statistical mechanical system associated with BTZ black
holes and their microstates, and relate them. As a further non-trivial check we
show the horizon fluff proposal correctly reproduces the expected logarithmic
corrections to the BTZ entropy.Comment: 47pp, v2: added references, minor correction in section 6.1, results
unchanged, v3: 51pp, added figures, references and clarifications, to appear
in JHE
|
Horizon fluff, semi-classical black hole microstates - Log-corrections
to BTZ entropy and black hole/particle correspondence
|
horizon fluff, semi-classical black hole microstates - log-corrections to btz entropy and black hole/particle correspondence
|
horizon fluff proposal microstates generic belong horizon hairs horizon region. horizon fluff proposal holes. clarify picture microstates coherent hilbert conic virasoro descendants impose bohr quantization deficit. holes viewed condensates solitonic particles. canonical microcanonical descriptions holes microstates relate them. trivial check horizon fluff proposal correctly reproduces logarithmic minor unchanged clarifications
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non_dup
|
[] |
83842129
|
10.1007/JHEP08(2017)088
|
We present the first combination of NLO QCD matrix elements for di-Higgs
production, retaining the full top quark mass dependence, with a parton shower.
Results are provided within both the POWHEG-BOX and MadGraph5_aMC@NLO Monte
Carlo frameworks. We assess in detail the theoretical uncertainties and provide
differential results. We find that, as expected, the shower effects are
relatively large for observables like the transverse momentum of the Higgs
boson pair, which are sensitive to extra radiation. However, these shower
effects are still much smaller than the differences between the Born-improved
HEFT approximation and the full NLO calculation in the tails of the
distributions.Comment: replaced by published version; in addition typos corrected in
definition of pole coefficients below Eq.(2.4
|
NLO predictions for Higgs boson pair production with full top quark mass
dependence matched to parton showers
|
nlo predictions for higgs boson pair production with full top quark mass dependence matched to parton showers
|
retaining parton shower. powheg madgraph monte carlo frameworks. results. shower observables boson extra radiation. shower born heft tails replaced typos corrected pole
|
non_dup
|
[] |
83850048
|
10.1007/JHEP08(2017)089
|
We propose to realize (natural) NMSSM spectrum from deflected AMSB with new
messenger-matter interactions. With additional messenger-matter interactions
involving ${\bf 10}\oplus{\bf \overline{10}}$ representation messengers, the
muon g-2 anomaly can be solved at $2\sigma$ (or $3\sigma$) level with the
corresponding gluino mass range $2.8~{\rm TeV}<m_{\tilde{g}}<5.4~ {\rm TeV}$
(or $2.6 ~{\rm TeV}<m_{\tilde{g}}<7.3~ {\rm TeV}$). Besides, our scenario is
fairly natural within which the involved fine tuning can be as low as 47. So,
in the framework of AMSB-type scenarios, NMSSM can be advantageous in
explaining the muon g-2 anomaly in compare with MSSM.Comment: 23 pages, 7 figure
|
Solving The Muon g-2 Anomaly With Natural NMSSM From Generalized
Deflected AMSB
|
solving the muon g-2 anomaly with natural nmssm from generalized deflected amsb
|
propose realize nmssm deflected amsb messenger interactions. messenger involving oplus overline messengers muon anomaly solved sigma sigma gluino tilde tilde besides fairly fine tuning amsb scenarios nmssm advantageous explaining muon anomaly pages
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non_dup
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[] |
84332496
|
10.1007/JHEP08(2017)090
|
We compute the supersymmetric partition function of $\mathcal{N}{=}1$
supersymmetric gauge theories with an $R$-symmetry on $\mathcal{M}_4 \cong
\mathcal{M}_{g,p}\times S^1$, a principal elliptic fiber bundle of degree $p$
over a genus-$g$ Riemann surface, $\Sigma_g$. Equivalently, we compute the
generalized supersymmetric index $I_{\mathcal{M}_{g,p}}$, with the
supersymmetric three-manifold ${\mathcal{M}_{g,p}}$ as the spatial slice. The
ordinary $\mathcal{N}{=}1$ supersymmetric index on the round three-sphere is
recovered as a special case. We approach this computation from the point of
view of a topological $A$-model for the abelianized gauge fields on the base
$\Sigma_g$. This $A$-model---or $A$-twisted two-dimensional
$\mathcal{N}{=}(2,2)$ gauge theory---encodes all the information about the
generalized indices, which are viewed as expectations values of some
canonically-defined surface defects wrapped on $T^2$ inside $\Sigma_g \times
T^2$. Being defined by compactification on the torus, the $A$-model also enjoys
natural modular properties, governed by the four-dimensional 't Hooft
anomalies. As an application of our results, we provide new tests of Seiberg
duality. We also present a new evaluation formula for the three-sphere index as
a sum over two-dimensional vacua.Comment: 91 pages including appendices; v2: corrected typos and added
references, JHEP versio
|
$\mathcal{N}{=}1$ supersymmetric indices and the four-dimensional
A-model
|
$\mathcal{n}{=}1$ supersymmetric indices and the four-dimensional a-model
|
supersymmetric partition mathcal supersymmetric mathcal cong mathcal principal elliptic fiber bundle genus riemann sigma equivalently supersymmetric mathcal supersymmetric manifold mathcal slice. ordinary mathcal supersymmetric round sphere recovered case. topological abelianized sigma twisted mathcal encodes indices viewed expectations canonically defects wrapped sigma compactification torus enjoys modular governed hooft anomalies. seiberg duality. sphere pages appendices corrected typos jhep versio
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non_dup
|
[] |
73992778
|
10.1007/JHEP08(2017)091
|
We present standard model (SM) estimates for exclusive $c \to u \gamma$
processes in heavy quark and hybrid frameworks. Measured branching ratios
${\cal{B}}(D^0 \to (\phi, \bar K^{*0}) \gamma)$ are at or somewhat exceeding
the upper range of the SM and suggest slow convergence of the $1/m_D,
\alpha_s$-expansion. Model-independent constraints on $|\Delta C|=|\Delta U|=1$
dipole operators from ${\cal{B}}(D^0 \to \rho^0 \gamma)$ data are obtained.
Predictions and implications for leptoquark models are worked out. While
branching ratios are SM-like CP asymmetries $\lesssim 10 \%$ can be induced. In
SUSY deviations from the SM can be even larger with CP asymmetries of $O(0.1)$.
If $\Lambda_c$-baryons are produced polarized, such as at the $Z$-pole, an
angular asymmetry in $\Lambda_c \to p \gamma$ decays can be studied that is
sensitive to chirality-flipped contributions.Comment: 23 pages plus references and appendices, 7 figures; v2:
clarifications and references added, conclusions unchanged; v3: In section
IV.B on leptoquark models matching corrected and subsequent text, tables and
equations adapted. Phenomenological results and conclusions unchange
|
Rare radiative charm decays within the standard model and beyond
|
rare radiative charm decays within the standard model and beyond
|
exclusive gamma hybrid frameworks. branching gamma somewhat exceeding slow alpha expansion. delta delta dipole gamma obtained. leptoquark worked out. branching asymmetries lesssim induced. susy deviations asymmetries lambda baryons polarized pole asymmetry lambda gamma decays chirality flipped pages appendices clarifications unchanged iv.b leptoquark matching corrected tables adapted. phenomenological unchange
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non_dup
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[] |
83859386
|
10.1007/JHEP08(2017)092
|
We propose several Two Higgs Doublet Models with the addition of an Abelian
gauge group which free the usual framework from flavor changing neutral
interactions and explain neutrino masses through the seesaw mechanism. We
discuss the kinetic and mass-mixing gripping phenomenology which encompass
several constraints coming from atomic parity violation, the muon anomalous
magnetic moment, rare meson decays, Higgs physics, LEP precision data,
neutrino-electron scattering, low energy accelerators and LHC probes.Comment: 54 pages, 10 figure
|
Neutrino Masses and Absence of Flavor Changing Interactions in the 2HDM
from Gauge Principles
|
neutrino masses and absence of flavor changing interactions in the 2hdm from gauge principles
|
propose doublet abelian usual flavor changing neutral seesaw mechanism. gripping phenomenology encompass coming parity violation muon anomalous moment rare meson decays precision accelerators pages
|
non_dup
|
[] |
83860323
|
10.1007/JHEP08(2017)093
|
We study the experimental constraints on strongly interacting vector-fermions
compatible with the relaxion mechanism and investigate any possible tuning. The
focus is on a minimal model and low confinement scale. More precisely, we study
bounds from electroweak precision tests, Higgs decay, Big Bang nucleosynthesis
and direct collider searches. The effect of these new fermions on vacuum
stability is also investigated. Combining our bounds, we show that the relaxion
mechanism becomes increasingly constrained and fine-tuned as the confinement
scale decreases. For example, a confinement scale of a few tens of MeVs would
require tuning at the percent level.Comment: 27 pages, 10 figures. References added. Matches published versio
|
Constraints on the relaxion mechanism with strongly interacting
vector-fermions
|
constraints on the relaxion mechanism with strongly interacting vector-fermions
|
interacting fermions compatible relaxion tuning. confinement scale. precisely bounds electroweak precision bang nucleosynthesis collider searches. fermions investigated. combining bounds relaxion increasingly constrained fine tuned confinement decreases. confinement tens mevs tuning percent pages figures. added. matches versio
|
non_dup
|
[] |
83871260
|
10.1007/JHEP08(2017)095
|
In the Minimal Supersymmetric Standard Model (MSSM) searches for the heaviest
CP-even and CP-odd Higgs $H$, $A$ to tau-lepton pairs severely constrain the
parameter region for large values of $\tan\beta$ and light Higgs bosons $H$,
$A$. We demonstrate how the experimental constraint can be avoided by new
decays to light third-generation sfermions, whose left-right couplings to $H$
can be maximised in regions of large trilinear couplings $A_{b}$, $A_{\tau}$
for sbottoms and staus, or large supersymmetric (SUSY) Higgs mass $\mu$ for
stops. Due to the $\tan\beta$-enhancement in the production cross-sections via
gluon-fusion and in association with bottom-quark pairs for $H$ and $A$, we
find that down-type sfermions, in particular, sbottoms perform a better job in
allowing more parameter space than up-type sfermions such as stops, which
require much larger values of $\mu$ to compensate for $\tan\beta$. Vacuum
stability as well as flavour observables constraints and direct searches for
SUSY particles are imposed. We also associate the lightest CP-even Higgs with
the observed 125 GeV SM-like Higgs and impose the experimental constraints from
the LHC.Comment: 16 pages, 6 figures. Final published versio
|
Enlarging Regions of the MSSM Parameter Space for Large $\tan\beta$ via
SUSY Decays of the Heavy Higgs Bosons
|
enlarging regions of the mssm parameter space for large $\tan\beta$ via susy decays of the heavy higgs bosons
|
supersymmetric mssm searches heaviest lepton severely constrain beta bosons avoided decays sfermions couplings maximised trilinear couplings sbottoms staus supersymmetric susy stops. beta enhancement gluon fusion sfermions sbottoms allowing sfermions stops compensate beta flavour observables searches susy imposed. associate lightest impose pages figures. versio
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non_dup
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[] |
83850813
|
10.1007/JHEP08(2017)096
|
We analyze the collider signatures of the real singlet extension of the
Standard Model in regions consistent with a strong first-order electroweak
phase transition and a singlet-like scalar heavier than the Standard Model-like
Higgs. A definitive correlation exists between the strength of the phase
transition and the trilinear coupling of the Higgs to two singlet-like scalars,
and hence between the phase transition and non-resonant scalar pair production
involving the singlet at colliders. We study the prospects for observing these
processes at the LHC and a future 100 TeV $pp$ collider, focusing particularly
on double singlet production. We also discuss correlations between the strength
of the electroweak phase transition and other observables at hadron and future
lepton colliders. Searches for non-resonant singlet-like scalar pair production
at 100 TeV would provide a sensitive probe of the electroweak phase transition
in this model, complementing resonant di-Higgs searches and precision
measurements. Our study illustrates a strategy for systematically exploring the
phenomenologically viable parameter space of this model, which we hope will be
useful for future work.Comment: 34 pages + 4 appendices, 13 figures. Comments welcome
|
Non-resonant Collider Signatures of a Singlet-Driven Electroweak Phase
Transition
|
non-resonant collider signatures of a singlet-driven electroweak phase transition
|
analyze collider signatures singlet electroweak singlet heavier higgs. definitive trilinear singlet scalars resonant involving singlet colliders. prospects observing collider focusing singlet production. electroweak observables hadron lepton colliders. searches resonant singlet electroweak complementing resonant searches precision measurements. illustrates systematically exploring phenomenologically viable hope pages appendices figures. comments welcome
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non_dup
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[] |
84093940
|
10.1007/JHEP08(2017)097
|
We revisit the relations between open and closed string scattering amplitudes
discovered by Kawai, Lewellen, and Tye (KLT). We show that they emerge from the
underlying algebro-topological identities known as the twisted period
relations. In order to do so, we formulate tree-level string theory amplitudes
in the language of twisted de Rham theory. There, open string amplitudes are
understood as pairings between twisted cycles and cocycles. Similarly, closed
string amplitudes are given as a pairing between two twisted cocycles. Finally,
objects relating the two types of string amplitudes are the $\alpha'$-corrected
bi-adjoint scalar amplitudes recently defined by the author [arXiv:1610.04230].
We show that they naturally arise as intersection numbers of twisted cycles. In
this work we focus on the combinatorial and topological description of twisted
cycles relevant for string theory amplitudes. In this setting, each twisted
cycle is a polytope, known in combinatorics as the associahedron, together with
an additional structure encoding monodromy properties of string integrals. In
fact, this additional structure is given by higher-dimensional generalizations
of the Pochhammer contour. An open string amplitude is then computed as an
integral of a logarithmic form over an associahedron. We show that the inverse
of the KLT kernel can be calculated from the knowledge of how pairs of
associahedra intersect one another in the moduli space. In the field theory
limit, contributions from these intersections localize to vertices of the
associahedra, giving rise to the bi-adjoint scalar partial amplitudes.Comment: 51 page
|
Combinatorics and Topology of Kawai-Lewellen-Tye Relations
|
combinatorics and topology of kawai-lewellen-tye relations
|
revisit amplitudes discovered kawai lewellen emerge algebro topological identities twisted relations. formulate amplitudes twisted rham theory. amplitudes understood pairings twisted cycles cocycles. amplitudes pairing twisted cocycles. relating amplitudes alpha corrected adjoint amplitudes naturally arise intersection twisted cycles. combinatorial topological twisted cycles amplitudes. twisted polytope combinatorics associahedron encoding monodromy integrals. generalizations pochhammer contour. logarithmic associahedron. kernel associahedra intersect moduli space. intersections localize associahedra giving adjoint
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non_dup
|
[] |
42739933
|
10.1007/JHEP08(2017)099
|
A discovery of neutrinoless double-$\beta$ decay would be profound, providing
the first direct experimental evidence of $\Delta L=2$ lepton number violating
processes. While a natural explanation is provided by an effective Majorana
neutrino mass, other new physics interpretations should be carefully evaluated.
At low--energies such new physics could manifest itself in the form of color
and $SU(2)_L \times U(1)_{Y}$ invariant higher dimension operators. Here we
determine a complete set of electroweak invariant dimension--9 operators, and
our analysis supersedes those that only impose $U(1)_{em}$ invariance. Imposing
electroweak invariance implies: 1) a significantly reduced set of leading order
operators compared to only imposing $U(1)_{em}$ invariance; and 2) other
collider signatures. Prior to imposing electroweak invariance we find a minimal
basis of 24 dimension-9 operators, which is reduced to 11 electroweak invariant
operators at leading order in the expansion in the Higgs vacuum expectation
value. We set up a systematic analysis of the hadronic realization of the
4-quark operators using chiral perturbation theory, and apply it to determine
which of these operators have long-distance pion enhancements at leading order
in the chiral expansion. We also find at dimension--11 and dimension--13 the
electroweak invariant operators that after electroweak symmetry breaking
produce the remaining $\Delta L=2$ operators that would appear at dimension--9
if only $U(1)_{em}$ is imposed.Comment: 31 pages, 6 tables, 1 figure. v3 updated references and added
extended introduction, conclusions unchanged from v2. v4: updated references;
final published versio
|
An electroweak basis for neutrinoless double $\beta$ decay
|
an electroweak basis for neutrinoless double $\beta$ decay
|
discovery neutrinoless beta profound delta lepton violating processes. explanation majorana interpretations carefully evaluated. manifest operators. electroweak supersedes impose invariance. imposing electroweak invariance imposing invariance collider signatures. imposing electroweak invariance electroweak expectation value. hadronic realization chiral perturbation pion enhancements chiral expansion. electroweak electroweak breaking delta pages tables figure. updated unchanged updated versio
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non_dup
|
[] |
83867015
|
10.1007/JHEP08(2017)100
|
The maximal four-dimensional supergravity with a dyonic ISO(7) gauging that
arises from the reduction of massive IIA on a six-sphere has recently been
shown to accommodate static BPS black holes with hyperbolic horizons. When
restricted to the N=2 subsector that retains one vector multiplet and the
universal hypermultiplet, the attractor mechanism was shown to fix both the
vector charges and the scalar fields at the horizon to a unique configuration
in terms of the gauging parameters. In order to assess the (non-)uniqueness of
BPS black hole horizons from massive IIA, we extend the study of the attractor
mechanism to other N=2 subsectors including additional matter multiplets. We
note that, while extending the hypermultiplet sector does not modify the set of
solutions to the attractor equations, the inclusion of additional vector
multiplets results in new hyperbolic/spherical horizons containing free
parameters. The model with three vector multiplets and the universal
hypermultiplet, which is the massive IIA analogue of the STU-model from
M-theory, may play a relevant role in massive IIA holography.Comment: 18 pages, 2 figures. v2: typos fixed, notation and presentation
improved, references added. v3: published versio
|
BPS black hole horizons from massive IIA
|
bps black hole horizons from massive iia
|
maximal supergravity dyonic gauging arises massive sphere accommodate holes hyperbolic horizons. restricted subsector retains multiplet universal hypermultiplet attractor charges horizon gauging parameters. uniqueness horizons massive extend attractor subsectors multiplets. extending hypermultiplet modify attractor inclusion multiplets hyperbolic spherical horizons parameters. multiplets universal hypermultiplet massive analogue massive pages figures. typos notation presentation added. versio
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non_dup
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[] |
83858135
|
10.1007/JHEP08(2017)101
|
The Hori-Tong and Hori dualities are infrared dualities between
two-dimensional gauge theories with $\mathcal{N}{=}(2,2)$ supersymmetry, which
are reminiscent of four-dimensional Seiberg dualities. We provide additional
evidence for those dualities with $U(N_c)$, $USp(2N_c)$, $SO(N)$ and $O(N)$
gauge groups, by matching correlation functions of Coulomb branch operators on
a Riemann surface $\Sigma_g$, in the presence of the topological $A$-twist. The
$O(N)$ theories studied, denoted by $O_+ (N)$ and $O_- (N)$, can be understood
as $\mathbb{Z}_2$ orbifolds of an $SO(N)$ theory. The correlators of these
theories on $\Sigma_g$ with $g > 0$ are obtained by computing correlators with
$\mathbb{Z}_2$-twisted boundary conditions and summing them up with weights
determined by the orbifold projection.Comment: 45 pages plus appendix; v2: updated bibliography and acknowledgement
|
A-twisted correlators and Hori dualities
|
a-twisted correlators and hori dualities
|
hori tong hori dualities infrared dualities mathcal supersymmetry reminiscent seiberg dualities. dualities matching coulomb branch riemann sigma topological twist. denoted understood mathbb orbifolds theory. correlators sigma correlators mathbb twisted summing weights orbifold pages updated bibliography acknowledgement
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non_dup
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[] |
83839764
|
10.1007/JHEP08(2017)102
|
We consider SUSY-like events with two decay chains, each terminating in an
invisible particle, whose true energy and momentum are not measured in the
detector. Nevertheless, a useful educated guess about the invisible momenta can
still be obtained by optimizing a suitable invariant mass function. We review
and contrast several proposals in the literature for such ansatze: four
versions of the M_T2-assisted on-shell reconstruction (MAOS), as well as
several variants of the on-shell constrained M_2 variables. We compare the
performance of these methods with regards to the mass determination of a new
particle resonance along the decay chain from the peak of the reconstructed
invariant mass distribution. For concreteness, we consider the event topology
of dilepton ttbar events and study each of the three possible subsystems, in
both a ttbar and a SUSY example. We find that the M_2 variables generally
provide sharper peaks and therefore better ansatze for the invisible momenta.
We show that the performance can be further improved by preselecting events
near the kinematic endpoint of the corresponding variable from which the
momentum ansatz originates.Comment: 38 pages, 15 figure
|
Testing Invisible Momentum Ansatze in Missing Energy Events at the LHC
|
testing invisible momentum ansatze in missing energy events at the lhc
|
susy chains terminating invisible detector. nevertheless educated guess invisible momenta optimizing function. proposals ansatze versions assisted reconstruction maos variants constrained variables. regards reconstructed distribution. concreteness topology dilepton ttbar subsystems ttbar susy example. sharper ansatze invisible momenta. preselecting kinematic endpoint ansatz pages
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non_dup
|
[] |
84327827
|
10.1007/JHEP08(2017)103
|
By using the exact solutions of the Weyl equation in a constant magnetic
field, the equal-time Wigner function for magnetized chiral plasma is derived.
It is found that the dependence of the Wigner function on the component of
momentum along the magnetic field is asymmetric and is correlated with the
fermion chirality. Such a dependence is principal for reproducing the correct
chiral magnetic and chiral separation effects. In the lowest Landau level
approximation, the equation for the equal-time Wigner function in a strong
magnetic field is derived. By making use of this equation, it is found that the
longitudinal collective modes in a strong magnetic field are gapped plasmons
whose gap is determined by the magnetic field. Unlike the ordinary magnetic
field, an axial one allows for the dispersion law of the collective excitations
asymmetric in the wave vector. The thermoelectric phenomena for chiral fermions
in strong magnetic and axial magnetic fields are studied and the corresponding
transport coefficients are calculated.Comment: 32 pages, 3 multi-panel figures; published versio
|
Wigner function and kinetic phenomena for chiral plasma in a strong
magnetic field
|
wigner function and kinetic phenomena for chiral plasma in a strong magnetic field
|
weyl wigner magnetized chiral derived. wigner asymmetric fermion chirality. principal reproducing chiral chiral effects. landau wigner derived. longitudinal collective gapped plasmons field. unlike ordinary axial collective excitations asymmetric vector. thermoelectric phenomena chiral fermions axial pages versio
|
non_dup
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[] |
83850804
|
10.1007/JHEP08(2017)104
|
We show that a modification of the model with a low energy scalar leptoquark
state carrying hypercharge $Y=7/6$ allows to accommodate both $R_K<1$ and
$R_{K^\ast}<1$, through loop effects, consistent with recent observations made
at LHCb. We describe details of the model, compute the relevant Wilson
coefficient and, after discussing a number of constraints, we examine the
phenomenological consequences of the model. The bounds on the lepton flavor
violating decay rates, induced by this model, include $\mathcal{B}(Z\to\mu\tau)
\lesssim \mathcal{O}(10^{-7})$, and $\mathcal{B}(B\to K\mu\tau) \lesssim
\mathcal{O}(10^{-9})$. We also comment on the interpretation of the bounds on
the leptoquark mass obtained from the direct searches at LHC.Comment: 18 pages, 7 figures (published version
|
A leptoquark model to accommodate $R_K^\mathrm{exp} <R_K^\mathrm{SM} $
and $R_{K^\ast}^\mathrm{exp}< R_{K^\ast}^\mathrm{SM}$
|
a leptoquark model to accommodate $r_k^\mathrm{exp} <r_k^\mathrm{sm} $ and $r_{k^\ast}^\mathrm{exp}< r_{k^\ast}^\mathrm{sm}$
|
modification leptoquark carrying hypercharge accommodate lhcb. wilson discussing examine phenomenological consequences model. bounds lepton flavor violating mathcal lesssim mathcal mathcal lesssim mathcal comment bounds leptoquark searches pages
|
non_dup
|
[] |
83859889
|
10.1007/JHEP08(2017)105
|
We consider rare semileptonic decays of a heavy $D$-meson into a light vector
meson in the framework of QCD factorization. In contrast to the corresponding
$B$-meson decays, the naive factorization hypothesis does not even serve as a
first approximation. Rather, the decay amplitudes appear to be dominated by
non-factorizable dynamics, e.g. through annihilation topologies, which are
particularly sensitive to long-distance hadronic contributions. We therefore
pay particular attention to intermediate vector-meson resonances appearing in
quark-loop and annihilation topologies. Compared to the analogous $B$-meson
decays, we identify a number of effects that result in very large theoretical
uncertainties for differential decay rates. Some of these effects are found to
cancel in the ratio of partially integrated decay rates for transversely and
longitudinally polarized $\rho$ mesons. On the phenomenological side this
implies a very limited potential to constrain physics beyond the Standard Model
by means of these decays.Comment: 40 pages, 12 figures, minor text changes, minor bug in numerical
output fixed, conclusions unchange
|
$D \to \rho \,\ell^+\ell^-$ Decays in the QCD Factorization Approach
|
$d \to \rho \,\ell^+\ell^-$ decays in the qcd factorization approach
|
rare semileptonic decays meson meson factorization. meson decays naive factorization serve approximation. amplitudes dominated factorizable e.g. annihilation topologies hadronic contributions. meson resonances appearing annihilation topologies. analogous meson decays rates. cancel partially transversely longitudinally polarized mesons. phenomenological constrain pages minor minor unchange
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non_dup
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[] |
84094669
|
10.1007/JHEP08(2017)106
|
We calculate the anomalous dimensions of higher spin singlet currents in the
critical $O(N)$ vector model at order $1/N^2$. The results are shown to be in
agreement with the four-loop perturbative computation in $\phi^4$ theory in
$4-2\epsilon$ dimensions. It is known that the order $1/N$ anomalous dimensions
of higher-spin currents happen to be the same in the Gross-Neveu and the
critical vector model. On the contrary, the order $1/N^2$ corrections are
different. The results can also be interpreted as a prediction for the two-loop
computation in the dual higher-spin gravity.Comment: 17 pages, 5 figure
|
Higher spin currents in the critical $O(N)$ vector model at $1/N^2$
|
higher spin currents in the critical $o(n)$ vector model at $1/n^2$
|
anomalous singlet currents perturbative epsilon dimensions. anomalous currents happen gross neveu model. contrary different. interpreted pages
|
non_dup
|
[] |
83864603
|
10.1007/JHEP08(2017)107
|
We calculate log corrections to the entropy of three-dimensional black holes
with "soft hairy" boundary conditions. Their thermodynamics possesses some
special features that preclude a naive direct evaluation of these corrections,
so we follow two different approaches. The first one exploits that the BTZ
black hole belongs to the spectrum of Brown-Henneaux as well as soft hairy
boundary conditions, so that the respective log corrections are related through
a suitable change of the thermodynamic ensemble. In the second approach the
analogue of modular invariance is considered for dual theories with anisotropic
scaling of Lifshitz type with dynamical exponent z at the boundary. On the
gravity side such scalings arise for KdV-type boundary conditions, which
provide a specific 1-parameter family of multi-trace deformations of the usual
AdS3/CFT2 setup, with Brown-Henneaux corresponding to z=1 and soft hairy
boundary conditions to the limiting case z=0. Both approaches agree in the case
of BTZ black holes for any non-negative z. Finally, for soft hairy boundary
conditions we show that not only the leading term, but also the log corrections
to the entropy of black flowers endowed with affine u(1) soft hair charges
exclusively depend on the zero modes and hence coincide with the ones for BTZ
black holes.Comment: 15 pages, no figures, v2: added re
|
Log corrections to entropy of three dimensional black holes with soft
hair
|
log corrections to entropy of three dimensional black holes with soft hair
|
holes hairy conditions. thermodynamics possesses preclude naive approaches. exploits belongs brown henneaux hairy respective thermodynamic ensemble. analogue modular invariance anisotropic lifshitz exponent boundary. scalings arise trace deformations usual setup brown henneaux hairy limiting agree holes hairy flowers endowed affine hair charges exclusively coincide pages
|
non_dup
|
[] |
130800871
|
10.1007/JHEP08(2017)108
|
We analyse a simple extension of the SM with just an additional scalar singlet coupled to the Higgs boson. We discuss the possible probes for electroweak baryogenesis in this model including collider searches, gravitational wave and direct dark matter detection signals. We show that a large portion of the model parameter space exists where the observation of gravitational waves would allow detection while the indirect collider searches would not.Ankit Beniwal, Marek Lewicki, James D. Wells, Martin White, Anthony G. William
|
Gravitational wave, collider and dark matter signals from a scalar singlet electroweak baryogenesis
|
gravitational wave, collider and dark matter signals from a scalar singlet electroweak baryogenesis
|
analyse singlet boson. probes electroweak baryogenesis collider searches gravitational signals. portion gravitational indirect collider searches not.ankit beniwal marek lewicki james wells martin anthony william
|
non_dup
|
[] |
83837642
|
10.1007/JHEP08(2017)112
|
We provide hadronic input for the $B$-meson semileptonic transitions to a
light pseudoscalar meson at large recoil. The $B_s\to K$ form factor calculated
from QCD light-cone sum rule is updated, to be used for a $|V_{ub}|$
determination from the $B_s\to K \ell \nu$ width. Furthermore, we calculate the
hadronic input for the binned observables of $B \to \pi \ell^+ \ell^-$ and $B
\to K \ell^+ \ell^-$. In addition to the form factors, the nonlocal hadronic
matrix elements are obtained, combining QCD factorization and light-cone sum
rules with hadronic dispersion relations. We emphasize that, due to nonlocal
effects, the ratio of branching fractions of these decays is not sufficient for
an accurate extraction of the $|V_{td}/V_{ts}|$ ratio. Instead, we suggest to
determine the Wolfenstein parameters $A,\rho,\eta$ of the CKM matrix, combining
the branching fractions of $B \to K \ell^+ \ell^-$ and $B \to \pi \ell^+
\ell^-$ with the direct $CP$-asymmetry in the latter decay. We also obtain the
hadronic matrix elements for a yet unexplored channel $B_s \to K \ell^+
\ell^-$.Comment: 21 pages, 4 figures, 5 tables, a few comments and references addded,
version accepted for publication in JHE
|
$B_{s}\to K \ell \nu_\ell$ and $B_{(s)} \to \pi (K) \ell^+\ell^-$ decays
at large recoil and CKM matrix elements
|
$b_{s}\to k \ell \nu_\ell$ and $b_{(s)} \to \pi (k) \ell^+\ell^-$ decays at large recoil and ckm matrix elements
|
hadronic meson semileptonic pseudoscalar meson recoil. cone updated width. hadronic binned observables nonlocal hadronic combining factorization cone hadronic relations. emphasize nonlocal branching fractions decays extraction ratio. wolfenstein combining branching fractions asymmetry decay. hadronic unexplored .comment pages tables comments addded publication
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non_dup
|
[] |
84327766
|
10.1007/JHEP08(2017)113
|
We present the first determination of Higgs-boson decay to hadrons at the
next-to-next-to-next-to-next-to-leading order of perturbative QCD in the limit
of a heavy top quark and massless light flavours. This result has been obtained
by computing the absorptive parts of the relevant five-loop self-energy for a
general gauge group and combining the outcome with the corresponding
coefficient function already known to this order in QCD. Our new result reduces
the uncertainty due to the truncation of the perturbation series to a fraction
of the uncertainty due to the present error of the strong coupling constant. We
have also performed the corresponding but technically simpler computations for
direct Higgs decay to bottom quarks and for the electromagnetic R-ratio in e^+
e^- -> hadrons, thus verifying important fifth-order results obtained so far
only by one group.Comment: 26 pages, LaTeX, 2 axodraw2 and 4 eps figures. FORM files of the main
results available with the source. v2: version accepted by JHEP: introduction
and summary slightly extended, minor other text changes, a few additional
reference
|
On Higgs decays to hadrons and the R-ratio at N^4LO
|
on higgs decays to hadrons and the r-ratio at n^4lo
|
boson hadrons perturbative massless flavours. absorptive combining qcd. reduces truncation perturbation constant. technically simpler computations quarks electromagnetic hadrons verifying fifth pages latex axodraw figures. files source. jhep minor
|
non_dup
|
[] |
83842580
|
10.1007/JHEP08(2017)114
|
Exclusive differential spectra in color-singlet processes at hadron colliders
are benchmark observables that have been studied to high precision in theory
and experiment. We present an effective-theory framework utilizing
soft-collinear effective theory to incorporate massive (bottom) quark effects
into resummed differential distributions, accounting for both heavy-quark
initiated primary contributions to the hard scattering process as well as
secondary effects from gluons splitting into heavy-quark pairs. To be specific,
we focus on the Drell-Yan process and consider the vector-boson transverse
momentum, $q_T$, and beam thrust, $\mathcal T$, as examples of exclusive
observables. The theoretical description depends on the hierarchy between the
hard, mass, and the $q_T$ (or $\mathcal T$) scales, ranging from the decoupling
limit $q_T \ll m$ to the massless limit $m \ll q_T$. The phenomenologically
relevant intermediate regime $m \sim q_T$ requires in particular quark-mass
dependent beam and soft functions. We calculate all ingredients for the
description of primary and secondary mass effects required at NNLL$'$
resummation order (combining NNLL evolution with NNLO boundary conditions) for
$q_T$ and $\mathcal T$ in all relevant hierarchies. For the $q_T$ distribution
the rapidity divergences are different from the massless case and we discuss
features of the resulting rapidity evolution. Our results will allow for a
detailed investigation of quark-mass effects in the ratio of $W$ and $Z$ boson
spectra at small $q_T$, which is important for the precision measurement of the
$W$-boson mass at the LHC.Comment: 42 pages + appendices, 21 figures; v2: journal versio
|
Factorization and Resummation for Massive Quark Effects in Exclusive
Drell-Yan
|
factorization and resummation for massive quark effects in exclusive drell-yan
|
exclusive singlet hadron colliders benchmark observables precision experiment. utilizing collinear incorporate massive resummed accounting initiated gluons splitting pairs. drell boson thrust mathcal exclusive observables. hierarchy mathcal ranging decoupling massless phenomenologically functions. ingredients nnll resummation combining nnll nnlo mathcal hierarchies. rapidity divergences massless rapidity evolution. boson precision boson pages appendices versio
|
non_dup
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[] |
73401115
|
10.1007/JHEP08(2017)115
|
We derive the latest constraints on various simplified models of natural SUSY
with light higgsinos, stops and gluinos, using a detailed and comprehensive
reinterpretation of the most recent 13 TeV ATLAS and CMS searches with $\sim
15$ fb$^{-1}$ of data. We discuss the implications of these constraints for
fine-tuning of the electroweak scale. While the most "vanilla" version of SUSY
(the MSSM with $R$-parity and flavor-degenerate sfermions) with 10% fine-tuning
is ruled out by the current constraints, models with decoupled valence squarks
or reduced missing energy can still be fully natural. However, in all of these
models, the mediation scale must be extremely low ($<100$ TeV). We conclude by
considering the prospects for the high-luminosity LHC era, where we expect the
current limits on particle masses to improve by up to $\sim 1$ TeV, and discuss
further model-building directions for natural SUSY that are motivated by this
work.Comment: v2: added tree level- parton shower matching, fixed bug in Delphes,
main results unchanged. 24 pages, 7 figures, plus appendi
|
Cornering Natural SUSY at LHC Run II and Beyond
|
cornering natural susy at lhc run ii and beyond
|
derive latest simplified susy higgsinos stops gluinos comprehensive reinterpretation atlas searches data. fine tuning electroweak scale. vanilla susy mssm parity flavor degenerate sfermions fine tuning ruled decoupled valence squarks missing natural. mediation extremely prospects luminosity directions susy motivated parton shower matching delphes unchanged. pages appendi
|
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[] |
83863252
|
10.1007/JHEP08(2017)116
|
We study the T-dualisability criteria of Chatzistavrakidis, Deser and Jonke
[3] who recently used Lie algebroid gauge theories to obtain sigma models
exhibiting a "T-duality without isometry". We point out that those
T-dualisability criteria are not written invariantly in [3] and depend on the
choice of the algebroid framing. We then show that there always exists an
isometric framing for which the Lie algebroid gauging boils down to standard
Yang-Mills gauging. The "T-duality without isometry" of Chatzistavrakidis,
Deser and Jonke is therefore nothing but traditional isometric non-Abelian
T-duality in disguise.Comment: 15 page
|
Hidden isometry of "T-duality without isometry"
|
hidden isometry of "t-duality without isometry"
|
dualisability chatzistavrakidis deser jonke algebroid sigma exhibiting duality isometry dualisability invariantly algebroid framing. isometric framing algebroid gauging boils mills gauging. duality isometry chatzistavrakidis deser jonke nothing traditional isometric abelian duality
|
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[] |
73403588
|
10.1007/JHEP08(2017)118
|
We study CFT data of 3-dimensional superconformal field theories (SCFTs)
arising from wrapped two M5-branes on closed hyperbolic 3-manifolds. Via
so-called 3d/3d correspondence, central charges of these SCFTs are related to a
$SL(2)$ Chern-Simons (CS) invariant on the 3-manifolds. We give a rigorous
definition of the invariant in terms of resurgence theory and a state-integral
model for the complex CS theory. We numerically evaluate the central charges
for several closed 3-manifolds with small hyperbolic volume. The computation
suggests that the wrapped M5-brane systems give infinitely many discrete SCFTs
with small central charges. We also analyze these `minimal' SCFTs in the eye of
3d $\mathcal{N}=2$ superconformal bootstrap.Comment: 32 pages, 7 figures; v2: minor corrections, references adde
|
3d $\mathcal{N}=2$ minimal SCFTs from Wrapped M5-branes
|
3d $\mathcal{n}=2$ minimal scfts from wrapped m5-branes
|
superconformal scfts arising wrapped branes hyperbolic manifolds. correspondence charges scfts chern simons manifolds. rigorous resurgence theory. numerically charges manifolds hyperbolic volume. wrapped brane infinitely scfts charges. analyze scfts mathcal superconformal pages minor adde
|
non_dup
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[] |
83856270
|
10.1007/JHEP08(2017)119
|
We give a new expression for the supercurrent and its conservation in curved
${\cal N}=1$, $D=4$ superspace using the superconformal approach. The first
component of the superfield, whose lowest component is the vector auxiliary
field gives the (super)Einstein equations. Its trace and couplings to conformal
and non-conformal matter is presented. In a suitable dilatational gauge, the
conformal gauge, we obtain an update of the Callan-Coleman-Jackiw improved
currents for conformal matter, containing $R$-symmetry corrections for a new
traceless covariantly conserved energy--momentum tensor. We observe that in the
Poincar\'e gauge, where standard Poincar\'e supergravity is usually formulated,
the currents are not improved and then the higher conformal symmetry of the
matter sector is obscured. The curvature multiplets are used to find
supersymmetric curved backgrounds and some examples are exhibited in agreement
with existing results.Comment: 43 pages; v2: Typos corrected. A subsection, an appendix and
references adde
|
The Supercurrent and Einstein equations in the Superconformal
formulation
|
the supercurrent and einstein equations in the superconformal formulation
|
supercurrent conservation curved superspace superconformal approach. superfield auxiliary super einstein equations. trace couplings conformal conformal presented. dilatational conformal update callan coleman jackiw currents conformal traceless covariantly conserved tensor. poincar poincar supergravity formulated currents conformal obscured. curvature multiplets supersymmetric curved backgrounds exhibited pages typos corrected. subsection adde
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non_dup
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[] |
83855967
|
10.1007/JHEP08(2017)121
|
We numerically study the behaviour of entanglement entropy for a free scalar
field on the noncommutative ("fuzzy") sphere after a mass quench. It is known
that the entanglement entropy before a quench violates the usual area law due
to the non-local nature of the theory. By comparing our results to the ordinary
sphere, we find results that, despite this non-locality, are compatible with
entanglement being spread by ballistic propagation of entangled quasi-particles
at a speed no greater than the speed of light. However, we also find that, when
the pre-quench mass is much larger than the inverse of the short-distance
cutoff of the fuzzy sphere (a regime with no commutative analogue), the
entanglement entropy spreads faster than allowed by a local model.Comment: 1+14 pages, 8 figures v2: References added, matches published versio
|
Time dependence of entanglement entropy on the fuzzy sphere
|
time dependence of entanglement entropy on the fuzzy sphere
|
numerically entanglement noncommutative fuzzy sphere quench. entanglement quench violates usual theory. ordinary sphere locality compatible entanglement spread ballistic propagation entangled quasi light. quench cutoff fuzzy sphere commutative analogue entanglement spreads faster pages matches versio
|
non_dup
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[] |
83860273
|
10.1007/JHEP08(2017)122
|
The discovery potential of light pseudo scalar Higgs boson for the mass range
10-60 GeV is explored. In the context of the next-to-minimal supersymmetric
standard(NMSSM) model, the branching fraction of light pseudo scalar Higgs
boson decaying to a pair of photon can be quite large. A pair of light pseudo
scalar Higgs boson produced indirectly through the standard model Higgs boson
decay yields multiple photons in the final state and the corresponding
production rate is restricted by ATLAS data. Discussing the impact of this
constraint in the NMSSM, the detection prospects of light pseudoscalar Higgs
boson in the channel consisting of at least three photons, a lepton and missing
transverse energy are reported. It is observed that the possibilities of
finding the pseudoscalar Higgs boson for the above mass range are promising for
an integrated luminosity $\mathcal{L}=100 \text{fb}^{-1}$ with moderate
significances, which can reach to more than 5$\sigma$ for higher luminosity
options.Comment: 24 pages, 4 figures, updated reference
|
Detection prospects of light pseudoscalar Higgs boson at the LHC
|
detection prospects of light pseudoscalar higgs boson at the lhc
|
discovery pseudo boson explored. supersymmetric nmssm branching pseudo boson decaying large. pseudo boson indirectly boson photons restricted atlas data. discussing nmssm prospects pseudoscalar boson consisting photons lepton missing reported. possibilities pseudoscalar boson promising luminosity mathcal moderate significances sigma luminosity pages updated
|
non_dup
|
[] |
83868975
|
10.1007/JHEP08(2017)123
|
We compile information from low-energy observables sensitive to
flavor-conserving 4-fermion operators with two or four leptons. Our analysis
includes data from e+e- colliders, neutrino scattering on electron or nucleon
targets, atomic parity violation, parity-violating electron scattering, and the
decay of pions, neutrons, nuclei and tau leptons. We recast these data as
tree-level constraints on 4-fermion operators in the Standard Model Effective
Field Theory (SMEFT) where the SM Lagrangian is extended by dimension-6
operators. We allow all independent dimension-6 operators to be simultaneously
present with an arbitrary flavor structure. The results are presented as a
multi-dimensional likelihood function in the space of dimension-6 Wilson
coefficients, which retains information about the correlations. In this form,
the results can be readily used to place limits on masses and couplings in a
large class of new physics theories.Comment: 39 pages; full correlation matrix and likelihood function available
in Mathematica notebook at
https://www.dropbox.com/s/26nh71oebm4o12k/SMEFTlikelihood.nb?dl=0 v2:
comments and references added, translation to Warsaw basis provided in
notebook; v3: references adde
|
Compilation of low-energy constraints on 4-fermion operators in the
SMEFT
|
compilation of low-energy constraints on 4-fermion operators in the smeft
|
compile observables flavor conserving fermion leptons. colliders nucleon targets parity violation parity violating pions neutrons nuclei leptons. recast fermion smeft lagrangian operators. simultaneously flavor structure. likelihood wilson retains correlations. readily couplings pages likelihood mathematica notebook comments translation warsaw notebook adde
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[] |
73392619
|
10.1007/JHEP08(2017)124
|
In this note we consider aspects of the current algebra interpretation of
multi-soft limits of tree-level gluon scattering amplitudes in four dimensions.
Building on the relation between a positive helicity gluon soft-limit and the
Ward identity for a level-zero Kac-Moody current, we use the double-soft limit
to define the Sugawara energy-momentum tensor and, by using the triple- and
quadruple-soft limits, show that it satisfies the correct OPEs for a CFT. We
study the resulting Knizhnik-Zamolodchikov equations and show that they hold
for positive helicity gluons in MHV amplitudes. Turning to the sub-leading
soft-terms we define a one-parameter family of currents whose Ward identities
correspond to the universal tree-level sub-leading soft-behaviour. We compute
the algebra of these currents formed with the leading currents and amongst
themselves. Finally, by parameterising the ambiguity in the double-soft limit
for mixed helicities, we introduce a non-trivial OPE between the holomorphic
and anti-holomorphic currents and study some of its implications.Comment: 24 pages, 1 figur
|
Multi-Soft gluon limits and extended current algebras at null-infinity
|
multi-soft gluon limits and extended current algebras at null-infinity
|
gluon amplitudes dimensions. helicity gluon ward moody sugawara triple quadruple satisfies opes cft. knizhnik zamolodchikov hold helicity gluons amplitudes. turning currents ward identities universal behaviour. currents currents amongst themselves. parameterising ambiguity helicities trivial holomorphic holomorphic currents pages figur
|
non_dup
|
[] |
83864948
|
10.1007/JHEP08(2017)125
|
We continue to investigate the dual description of the Virasoro conformal
blocks arising in the framework of the classical limit of the AdS$_3$/CFT$_2$
correspondence. To give such an interpretation in previous studies, certain
restrictions were necessary. Our goal here is to consider more general
situation available through the worldline approximation to the dual AdS
gravity. Namely, we are interested in computing the spherical conformal blocks
without the previously imposed restrictions on the conformal dimensions of the
internal channels. The duality is realised as an equality of the so-called
heavy-light limit of the n-point conformal block and the action of n-2
particles propagating in some AdS-like background with either a conical
singularity or a BTZ black hole. We describe a procedure that allows relaxing
the constraint on the intermediate channels. To obtain an explicit expression
for the conformal block on the CFT side, we use a recently proposed recursion
procedure and find full agreement between the results of the boundary and bulk
computations.Comment: 13 pages, v3: refs added, typos remove
|
Geodesic description of Heavy-Light Virasoro blocks
|
geodesic description of heavy-light virasoro blocks
|
continue virasoro conformal blocks arising correspondence. restrictions necessary. goal worldline gravity. interested spherical conformal blocks imposed restrictions conformal channels. duality realised equality conformal propagating conical singularity hole. relaxing channels. conformal recursion pages refs typos remove
|
non_dup
|
[] |
83841601
|
10.1007/JHEP08(2017)126
|
We investigate a weak version of subsystem eigenstate thermalization
hypothesis (ETH) for a two-dimensional large central charge conformal field
theory by comparing the local equivalence of high energy state and thermal
state of canonical ensemble. We evaluate the single-interval R\'enyi entropy
and entanglement entropy for a heavy primary state in short interval expansion.
We verify the results of R\'enyi entropy by two different replica methods. We
find nontrivial results at the eighth order of short interval expansion, which
include an infinite number of higher order terms in the large central charge
expansion. We then evaluate the relative entropy of the reduced density
matrices to measure the difference between the heavy primary state and thermal
state of canonical ensemble, and find that the aforementioned nontrivial eighth
order results make the relative entropy unsuppressed in the large central
charge limit. By using Pinsker's and Fannes-Audenaert inequalities, we can
exploit the results of relative entropy to yield the lower and upper bounds on
trace distance of the excited-state and thermal-state reduced density matrices.
Our results are consistent with subsystem weak ETH, which requires the above
trace distance is of power-law suppression by the large central charge.
However, we are unable to pin down the exponent of power-law suppression. As a
byproduct we also calculate the relative entropy to measure the difference
between the reduced density matrices of two different heavy primary states.Comment: 28 pages, 4 figures;v2 change author list;v3 related subtleties about
weak ETH clarified; v4 minor correction to match JHEP versio
|
Subsystem eigenstate thermalization hypothesis for entanglement entropy
in CFT
|
subsystem eigenstate thermalization hypothesis for entanglement entropy in cft
|
subsystem eigenstate thermalization conformal equivalence canonical ensemble. enyi entanglement expansion. verify enyi replica methods. nontrivial eighth infinite expansion. canonical ensemble aforementioned nontrivial eighth unsuppressed limit. pinsker fannes audenaert inequalities exploit bounds trace excited matrices. subsystem trace suppression charge. unable exponent suppression. byproduct pages subtleties clarified minor match jhep versio
|
non_dup
|
[] |
84326728
|
10.1007/JHEP08(2017)127
|
We consider classical, pure Yang-Mills theory in a box. We show how a set of
static electric fields that solve the theory in an adiabatic limit correspond
to geodesic motion on the space of vacua, equipped with a particular Riemannian
metric that we identify. The vacua are generated by spontaneously broken global
gauge symmetries, leading to an infinite number of conserved momenta of the
geodesic motion. We show that these correspond to the soft multipole charges of
Yang-Mills theory.Comment: 46 pages, 1 figure, Published versio
|
Strolling along gauge theory vacua
|
strolling along gauge theory vacua
|
mills box. solve adiabatic geodesic vacua equipped riemannian identify. vacua spontaneously broken symmetries infinite conserved momenta geodesic motion. multipole charges mills pages versio
|
non_dup
|
[] |
83859390
|
10.1007/JHEP08(2017)128
|
We bootstrap ${\cal N}=(1,0)$ superconformal field theories in six
dimensions, by analyzing the four-point function of flavor current multiplets.
Assuming $E_8$ flavor group, we present universal bounds on the central charge
$C_T$ and the flavor central charge $C_J$. Based on the numerical data, we
conjecture that the rank-one E-string theory saturates the universal lower
bound on $C_J$, and numerically determine the spectrum of long multiplets in
the rank-one E-string theory. We comment on the possibility of solving the
higher-rank E-string theories by bootstrap and thereby probing M-theory on
AdS${}_7\times{\rm S}^4$/$\mathbb{Z}_2$.Comment: 59 pages, 10 figures, 4 tables; v2-v5: typos corrected, references
adde
|
Carving Out the End of the World or (Superconformal Bootstrap in Six
Dimensions)
|
carving out the end of the world or (superconformal bootstrap in six dimensions)
|
bootstrap superconformal analyzing flavor multiplets. flavor universal bounds flavor conjecture saturates universal numerically multiplets theory. comment solving bootstrap thereby probing mathbb .comment pages tables typos corrected adde
|
non_dup
|
[] |
83857022
|
10.1007/JHEP08(2017)130
|
We study a variant of Gauge-flation where the gauge symmetry is spontaneously
broken by a Higgs sector. We work in the Stueckelberg limit and demonstrate
that the dynamics remain (catastrophically) unstable for cases where the gauge
field masses satisfy $\gamma < 2$, where $\gamma = g^2\psi^2/H^2$, $g$ is the
gauge coupling, $\psi$ is the gauge field vacuum expectation value, and $H$ is
the Hubble rate. We compute the spectrum of density fluctuations and
gravitational waves, and show that the model can produce observationally viable
spectra. The background gauge field texture violates parity, resulting in a
chiral gravitational wave spectrum. This arises due to an exponential
enhancement of one polarization of the spin-2 fluctuation of the gauge field.
Higgsed Gauge-flation can produce observable gravitational waves at
inflationary energy scales well below the GUT scale.Comment: 52 pages, 14 figure
|
Higgsed Gauge-flation
|
higgsed gauge-flation
|
variant flation spontaneously broken sector. stueckelberg catastrophically unstable satisfy gamma gamma expectation hubble rate. gravitational observationally viable spectra. texture violates parity chiral gravitational spectrum. arises exponential enhancement fluctuation field. higgsed flation observable gravitational inflationary pages
|
non_dup
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[] |
78507639
|
10.1007/JHEP08(2017)131
|
In a recent paper we studied the effect of new-physics operators with
different Lorentz structures on the semileptonic $\Lambda_b \to \Lambda_c \tau
\bar{\nu}_{\tau}$ decay. This decay is of interest in light of the
$R({D^{(*)}})$ puzzle in the semileptonic $\bar{B} \to D^{(*)} \tau
{\bar\nu}_\tau$ decays. In this work we add tensor operators to extend our
previous results and consider both model-independent new physics (NP) and
specific classes of models proposed to address the $R({D^{(*)}})$ puzzle. We
show that a measurement of $R(\Lambda_c) = {\cal B}[\Lambda_b \to \Lambda_c
\tau \bar{\nu}_{\tau}] / {\cal B}[\Lambda_b \to \Lambda_c \ell
\bar{\nu}_{\ell}]$ can strongly constrain the NP parameters of models discussed
for the $R({D^{(*)}})$ puzzle. We use form factors from lattice QCD to
calculate all $\Lambda_b \to \Lambda_c \tau \bar{\nu}_{\tau}$ observables. The
$\Lambda_b \to \Lambda_c$ tensor form factors had not previously been
determined in lattice QCD, and we present new lattice results for these form
factors here.Comment: 44 pages, 105 figure
|
Phenomenology of $\Lambda_b \to \Lambda_c \tau \bar{\nu}_{\tau}$ using
lattice QCD calculations
|
phenomenology of $\lambda_b \to \lambda_c \tau \bar{\nu}_{\tau}$ using lattice qcd calculations
|
lorentz semileptonic lambda lambda decay. puzzle semileptonic decays. extend puzzle. lambda lambda lambda lambda lambda constrain puzzle. lambda lambda observables. lambda lambda pages
|
non_dup
|
[] |
78508679
|
10.1007/JHEP08(2017)133
|
In this note, we explore the correspondence between four-dimensional flat
space S-matrix and two-dimensional CFT proposed by Pasterski et al. We
demonstrate that the factorization singularities of an n-point cubic diagram
reproduces the AdS Witten diagrams if mass conservation is imposed at each
vertex. Such configuration arises naturally if we consider the 4-dimensional
S-matrix as a compactified massless 5-dimensional theory. This identification
allows us to rewrite the massless S-matrix in the CHY formulation, where the
factorization singularities are re-interpreted as factorization limits of a
Riemann sphere. In this light, the map is recast into a form of 2d/2d
correspondence.Comment: 18 page
|
S-matrix singularities and CFT correlation functions
|
s-matrix singularities and cft correlation functions
|
explore correspondence pasterski factorization singularities cubic reproduces witten diagrams conservation imposed vertex. arises naturally compactified massless theory. rewrite massless formulation factorization singularities interpreted factorization riemann sphere. recast
|
non_dup
|
[] |
73957486
|
10.1007/JHEP08(2017)135
|
We continue our investigation of Z-theory, the second double-copy component
of open-string tree-level interactions besides super-Yang-Mills (sYM). We show
that the amplitudes of the extended non-linear sigma model (NLSM) recently
considered by Cachazo, Cha, and Mizera are reproduced by the leading
alpha'-order of Z-theory amplitudes in the semi-abelian case. The extension
refers to a coupling of NLSM pions to bi-adjoint scalars, and the semi-abelian
case involves to a partial symmetrization over one of the color orderings that
characterize the Z-theory amplitudes. Alternatively, the partial symmetrization
corresponds to a mixed interaction among abelian and non-abelian states in the
underlying open-superstring amplitude. We simplify these permutation sums via
monodromy relations which greatly increase the efficiency in extracting the
alpha'-expansion of these amplitudes. Their alpha'-corrections encode
higher-derivative interactions between NLSM pions and bi-colored scalars all of
which obey the duality between color and kinematics. Through double-copy, these
results can be used to generate the predictions of supersymmetric
Dirac-Born-Infeld-Volkov-Akulov theory coupled with sYM as well as a complete
tower of higher-order alpha'-corrections.Comment: 27 pages, v2: published versio
|
Semi-abelian Z-theory: NLSM+phi^3 from the open string
|
semi-abelian z-theory: nlsm+phi^3 from the open string
|
continue copy besides super mills amplitudes sigma nlsm cachazo mizera reproduced alpha amplitudes abelian case. refers nlsm pions adjoint scalars abelian involves symmetrization orderings characterize amplitudes. alternatively symmetrization abelian abelian superstring amplitude. simplify permutation sums monodromy greatly extracting alpha amplitudes. alpha encode nlsm pions colored scalars obey duality kinematics. copy supersymmetric dirac born infeld volkov akulov tower alpha pages versio
|
non_dup
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