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2126200
|
10.1007/JHEP08(2010)105
|
We apply the ADHMN construction to obtain the SU(n+1)(for generic values of
n) spherically symmetric BPS monopoles with minimal symmetry breaking. In
particular, the problem simplifies by solving the Weyl equation, leading to a
set of coupled equations, whose solutions are expressed in terms of the
Whittaker functions. Next, this construction is generalized for non-commutative
SU(n+1) BPS monopoles, where the corresponding solutions are given in terms of
the Heun B functions.Comment: 16 pages, Latex. Few typos corrected, version to appear in JHE
|
Weyl Equation and (Non)-Commutative SU(n+1) BPS Monopoles
|
weyl equation and (non)-commutative su(n+1) bps monopoles
|
adhmn generic spherically monopoles breaking. simplifies solving weyl whittaker functions. commutative monopoles heun pages latex. typos corrected
|
non_dup
|
[] |
1952964
|
10.1007/JHEP08(2010)106
|
We have utilized the concept of valon model to calculate the spin structure
functions of proton, neutron and deuteron. The valon structure itself is
universal and arises from the perturbative dressing of the valence quark in
QCD. Our results agree rather well with all the relevant experimental data on
$g_{1}^{p, n, d}$ and $g_{A}/g_{v}$, and suggests that the sea quark
contribution to the spin of proton is consistent with zero. It also reveals
that while the total quark contribution to the spin of valon is almost constant
at $Q^{2}>=1$ the gluon contribution grows with the increase of $Q^2$ and hence
requiring a sizable negative orbital angular momentum component $L_z$. This
component along with the singlet and non-singlet parts are calculated in the
Next-to-Leading order in QCD. We speculate that gluon contribution to the spin
content of the proton is about 60% for all $Q^2$ values. Finally, we show that
the size of gluon polarization and hence, $L_{z}$, is sensitive to the initial
scale$Q_{0}^{2}$.Comment: 24 pages, 9 Figure
|
Polarized Structure of Nucleon in the Valon Representation
|
polarized structure of nucleon in the valon representation
|
utilized valon proton neutron deuteron. valon universal arises perturbative dressing valence qcd. agree proton zero. reveals valon gluon grows requiring sizable orbital singlet singlet qcd. speculate gluon proton values. gluon .comment pages
|
non_dup
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[] |
2108973
|
10.1007/JHEP08(2010)108
|
We investigate the holographic superconductors immersed in an external
magnetic field by using the analytical approach. We obtain the spatially
dependent condensate solutions in the presence of the magnetism and find
analytically that the upper critical magnetic field satisfies the relation
given in the Ginzburg-Landau theory. We observe analytically the reminiscent of
the Meissner effect where the magnetic field expels the condensate. Extending
to the D-dimensional Gauss-Bonnet AdS black holes, we examine the influence
given by the Gauss-Bonnet coupling on the condensation. Different from the
positive coupling, we find that the negative Gauss-Bonnet coupling enhances the
condensation when the external magnetism is not strong enough.Comment: revised version, to appear in JHE
|
Analytical study on holographic superconductors in external magnetic
field
|
analytical study on holographic superconductors in external magnetic field
|
holographic superconductors immersed approach. spatially condensate magnetism analytically satisfies ginzburg landau theory. analytically reminiscent meissner expels condensate. extending gauss bonnet holes examine gauss bonnet condensation. gauss bonnet enhances condensation magnetism revised
|
non_dup
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[] |
1962613
|
10.1007/JHEP08(2010)109
|
We compute instanton corrections to correlators in the genus-zero topological
subsector of a (0,2) supersymmetric gauged linear sigma model with target space
P1xP1, whose left-moving fermions couple to a deformation of the tangent
bundle. We then deduce the theory's chiral ring from these correlators, which
reduces in the limit of zero deformation to the (2,2) ring. Finally, we compare
our results with the computations carried out by Adams et al.[ABS04] and Katz
and Sharpe[KS06]. We find immediate agreement with the latter and an
interesting puzzle in completely matching the chiral ring of the former.Comment: AMSLatex, 30 pages, one eps figure. V4: typos corrected, final
version appearing in JHE
|
Deformed Quantum Cohomology and (0,2) Mirror Symmetry
|
deformed quantum cohomology and (0,2) mirror symmetry
|
instanton correlators genus topological subsector supersymmetric gauged sigma moving fermions couple deformation tangent bundle. deduce chiral correlators reduces deformation ring. computations adams katz sharpe immediate puzzle matching chiral amslatex pages figure. typos corrected appearing
|
non_dup
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[] |
2133418
|
10.1007/JHEP08(2010)110
|
We study the geodesic equation in the space-time of an Abelian-Higgs string
and discuss the motion of massless and massive test particles. The geodesics
can be classified according to the particles energy, angular momentum and
linear momentum along the string axis. We observe that bound orbits of massive
particles are only possible if the Higgs boson mass is smaller than the gauge
boson mass, while massless particles always move on escape orbits. Moreover,
neither massive nor massless particles can ever reach the string axis for
non-vanishing angular momentum. We also discuss the dependence of light
deflection by a cosmic string as well as the perihelion shift of bound orbits
of massive particles on the ratio between Higgs and gauge boson mass and the
ratio between symmetry breaking scale and Planck mass, respectively.Comment: 20 pages including 14 figures; v2: references added, discussion on
null geodesics extended, numerical results adde
|
Geodesic motion in the space-time of a cosmic string
|
geodesic motion in the space-time of a cosmic string
|
geodesic abelian massless massive particles. geodesics classified axis. orbits massive boson boson massless move escape orbits. neither massive massless ever vanishing momentum. deflection cosmic perihelion orbits massive boson breaking planck pages geodesics adde
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non_dup
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[] |
2144092
|
10.1007/JHEP08(2010)111
|
The domain wall solutions of a Ginzburg-Landau non-linear $S^2$-sigma hybrid
model are unveiled. There are three types of basic topological walls and two
types of degenerate families of composite - one topological, the other
non-topological- walls. The domain wall solutions are identified as the finite
action trajectories (in infinite time) of a related mechanical system that is
Hamilton-Jacobi separable in sphero-conical coordinates. The physical and
mathematical features of these domain walls are thoroughly discussed.Comment: 26 pages, 18 figure
|
On domain walls in a Ginzburg-Landau non-linear S^2-sigma model
|
on domain walls in a ginzburg-landau non-linear s^2-sigma model
|
ginzburg landau sigma hybrid unveiled. topological walls degenerate families composite topological topological walls. trajectories infinite hamilton jacobi separable sphero conical coordinates. mathematical walls thoroughly pages
|
non_dup
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[] |
2132861
|
10.1007/JHEP08(2010)112
|
In this paper we compare the prediction for deep inelastic scattering from
N=4 SYM with the HERA experimental data. The paper conveys two results. The
first is the message that N=4 SYM is able to describe the DIS data with very
good accuracy ($\chi^2/d.o.f. \,\leq\,1.5$) in the region of $Q^2 = 0.85 \div
60\,GeV^2$ with $2/\sqrt{\lambda} = 0.7 \div 0.8 $ . The second is that the
value of string coupling constant $g_s$ turns out to be so small that none of
saturation effects will be visible in the region of accessible energies,
including the maximal energy of the LHC (W = 14 \,\,TeV).Comment: 13 pp., 7 figures in eps forma
|
Inelastic processes in DIS and N=4 SYM
|
inelastic processes in dis and n=4 sym
|
inelastic hera data. conveys results. message d.o.f. sqrt lambda turns none saturation visible accessible maximal .comment forma
|
non_dup
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[] |
2122458
|
10.1007/JHEP08(2010)113
|
We calculate the thermodynamic functions of pure-glue QCD to three-loop order
using the hard-thermal-loop perturbation theory (HTLpt) reorganization of
finite temperature quantum field theory. We show that at three-loop order
hard-thermal-loop perturbation theory is compatible with lattice results for
the pressure, energy density, and entropy down to temperatures $T\simeq3\;T_c$.
Our results suggest that HTLpt provides a systematic framework that can used to
calculate static and dynamic quantities for temperatures relevant at LHC.Comment: 24 pages, 13 figs. 2nd version: improved discussion and fixing typos.
Published in JHE
|
Three-loop HTL gluon thermodynamics at intermediate coupling
|
three-loop htl gluon thermodynamics at intermediate coupling
|
thermodynamic glue perturbation htlpt reorganization theory. perturbation compatible simeq htlpt quantities pages figs. fixing typos.
|
non_dup
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[] |
2125382
|
10.1007/JHEP08(2010)114
|
Motivated by a recent observation that the LLM geometries admit 1/4-BPS
M5-brane probes with worldvolume AdS3 X \Sigma_2 X S1 preserving the
R-symmetry, we initiate a classification of the most general AdS3 X S2
geometries in M-theory. We retain all field strengths consistent with symmetry
and derive the torsion conditions for M_6 in terms of two linearly independent
spinors. Surprisingly, we identify three Killing directions for M_6, but only
two of these generate isometries of the overall ansatz. We show that the
existence of this third direction depends on the norm of the spinors. Then,
specialising to the case where the spinors define an SU(2)-structure and the
class of solutions is 1/4-BPS, we note that supersymmetry dictates that all
magnetic fluxes necessarily thread the S2. Finally, by assuming that the two
remaining Killing directions are parallel and aligned with one of the two
vectors defining the SU(2)-structure, we derive a general relationship for the
two spinors before extracting a known class of solutions from the torsion
conditions.Comment: 32 pages, minor correction
|
Supersymmetric AdS3 X S2 M-theory geometries with fluxes
|
supersymmetric ads3 x s2 m-theory geometries with fluxes
|
motivated geometries admit brane probes worldvolume sigma preserving initiate geometries theory. retain strengths derive torsion linearly spinors. surprisingly killing directions isometries ansatz. norm spinors. specialising spinors supersymmetry dictates fluxes necessarily thread killing directions aligned defining derive spinors extracting torsion pages minor
|
non_dup
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[] |
2115574
|
10.1007/JHEP08(2010)115
|
We propose a spontaneous A4 flavor symmetry breaking scheme implemented in a
warped extra dimensional setup to explain the observed pattern of quark and
lepton masses and mixings. The main advantages of this choice are the
explanation of fermion mass hierarchies by wave function overlaps, the
emergence of tribimaximal neutrino mixing and zero quark mixing at the leading
order and the absence of tree-level gauge mediated flavor violations. Quark
mixing is induced by the presence of bulk flavons, which allow for cross-brane
interactions and a cross-talk between the quark and neutrino sectors, realizing
the spontaneous symmetry breaking pattern A4 --> nothing first proposed in
[X.G.\,He, Y.Y.\,Keum, R.R.\,Volkas, JHEP{0604}, 039 (2006)]. We show that the
observed quark mixing pattern can be explained in a rather economical way,
including the CP violating phase, with leading order cross-interactions, while
the observed difference between the smallest CKM entries V_{ub} and V_{td} must
arise from higher order corrections. We briefly discuss bounds on the
Kaluza-Klein scale implied by flavor changing neutral current processes in our
model and show that the residual little CP problem is milder than in flavor
anarchic models.Comment: 34 pages, 2 figures; version published in JHE
|
An A4 flavor model for quarks and leptons in warped geometry
|
an a4 flavor model for quarks and leptons in warped geometry
|
propose spontaneous flavor breaking implemented warped extra setup lepton mixings. advantages explanation fermion hierarchies overlaps emergence tribimaximal flavor violations. flavons brane talk sectors realizing spontaneous breaking nothing x.g. y.y. keum r.r. volkas jhep economical violating smallest entries arise corrections. briefly bounds kaluza klein implied flavor changing neutral residual milder flavor anarchic pages
|
non_dup
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[] |
2120367
|
10.1007/JHEP08(2010)116
|
We study the idea of the Higgs as a pseudo-Goldstone boson within the
framework of partial supersymmetry in Randall-Sundrum scenarios and their CFT
duals. The Higgs and third generation of the MSSM are composites arising from a
strongly coupled supersymmetric CFT with global symmetry SO(5) spontaneously
broken to SO(4), whilst the light generations and gauge fields are elementary
degrees of freedom whose couplings to the strong sector explicitly break the
global symmetry as well as supersymmetry. The presence of supersymmetry in the
strong sector may allow the compositeness scale to be raised to ~10 TeV without
fine tuning, consistent with the bounds from precision electro-weak
measurements and flavour physics. The supersymmetric flavour problem is also
solved. At low energies, this scenario reduces to the "More Minimal
Supersymmetric Standard Model" where only stops, Higgsinos and gauginos are
light and within reach of the LHC.Comment: 28 pages. v2 minor changes and Refs. adde
|
Partially Supersymmetric Composite Higgs Models
|
partially supersymmetric composite higgs models
|
pseudo goldstone boson supersymmetry randall sundrum scenarios duals. mssm composites arising supersymmetric spontaneously broken whilst generations elementary freedom couplings explicitly break supersymmetry. supersymmetry compositeness raised fine tuning bounds precision electro flavour physics. supersymmetric flavour solved. reduces supersymmetric stops higgsinos gauginos pages. minor refs. adde
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non_dup
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[] |
2130387
|
10.1007/JHEP08(2010)117
|
We perform a global analysis of cosmological observables in generalized
cosmologies which depart from $\Lambda$CDM models by allowing non-vanishing
curvature $\Omega_k\neq 0$, dark energy with equation of state with $\omega\neq
-1$, the presence of additional relativistic degrees of freedom $\Delta N_{\rm
rel}$, and neutrino masses $\Omega_\nu\neq 0$. By combining the data from
cosmic microwave background (CMB) experiments (in particular the latest results
from WMAP-7), the present day Hubble constant (H0) measurement, the
high-redshift Type-I supernovae (SN) results and the information from large
scale structure (LSS) surveys, we determine the parameters in the
10-dimensional parameter space for such models. We present the results from the
analysis when the full shape information from the LSS matter power spectrum
(LSSPS) is included versus when only the corresponding distance measurement
from the baryon acoustic oscillations (BAO) is accounted for. We compare the
bounds on the neutrino mass scale in these generalized scenarios with those
obtained for the 6+1 parameter analysis in $\Lambda{\rm CDM}+m_\nu$ models and
we also study the dependence of those on the set of observables included in the
analysis. Finally we combine these results with the information on neutrino
mass differences and mixing from the global analysis of neutrino oscillation
experiments and derive the presently allowed ranges for the two laboratory
probes of the absolute scale of neutrino mass: the effective electron neutrino
mass in single beta decay and the effective Majorana neutrino mass in
neutrinoless $\beta\beta$ decay.Comment: 19 pages, 4 figures. Acknowledgments correcte
|
Robust Cosmological Bounds on Neutrinos and their Combination with
Oscillation Results
|
robust cosmological bounds on neutrinos and their combination with oscillation results
|
cosmological observables cosmologies depart lambda allowing vanishing curvature omega omega relativistic freedom delta omega combining cosmic microwave latest wmap hubble supernovae surveys models. lssps baryon acoustic oscillations accounted for. bounds scenarios lambda observables analysis. combine oscillation derive presently ranges probes beta majorana neutrinoless beta beta pages figures. acknowledgments correcte
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non_dup
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2086340
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10.1007/JHEP08(2010)118
|
We present some new exact results for general four-dimensional superconformal
field theories. We derive differential equations governing the coupling
constant dependence of chiral primary correlators. For N=2 theories we show
that the Zamolodchikov metric on the moduli space and the operator mixing of
chiral primaries are quasi-topological quantities and constrained by
holomorphy. The equations that we find are the four-dimensional analogue of the
tt* equations in two-dimensions, discovered by the method of "topological
anti-topological fusion" by Cecotti and Vafa. Our analysis relies on conformal
perturbation theory and the superconformal Ward identities and does not use a
topological twist.Comment: 43 pages (29 pages + 4 appendices), 2 figures, harvmac, v2: fixed
typos, improved some derivations, numerical coefficients in tt* equations
correcte
|
Topological Anti-Topological Fusion in Four-Dimensional Superconformal
Field Theories
|
topological anti-topological fusion in four-dimensional superconformal field theories
|
superconformal theories. derive governing chiral correlators. zamolodchikov moduli chiral primaries quasi topological quantities constrained holomorphy. analogue discovered topological topological fusion cecotti vafa. relies conformal perturbation superconformal ward identities topological pages pages appendices harvmac typos derivations correcte
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non_dup
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2136434
|
10.1007/JHEP08(2010)119
|
The lowest-lying glueball masses are computed in SU($N$) gauge theory on a
spacetime lattice for constant value of the lattice spacing $a$ and for $N$
ranging from 3 to 8. The lattice spacing is fixed using the deconfinement
temperature at temporal extension of the lattice $N_T = 6$. The calculation is
conducted employing in each channel a variational ansatz performed on a large
basis of operators that includes also torelon and (for the lightest states)
scattering trial functions. This basis is constructed using an automatic
algorithm that allows us to build operators of any size and shape in any
irreducible representation of the cubic group. A good signal is extracted for
the ground state and the first excitation in several symmetry channels. It is
shown that all the observed states are well described by their large $N$
values, with modest ${\cal O}(1/N^2)$ corrections. In addition spurious states
are identified that couple to torelon and scattering operators. As a byproduct
of our calculation, the critical couplings for the deconfinement phase
transition for N=5 and N=7 and temporal extension of the lattice $N_T=6$ are
determined.Comment: 1+36 pages, 22 tables, 21 figures. Typos corrected, conclusions
unchanged, matches the published versio
|
Glueball masses in the large N limit
|
glueball masses in the large n limit
|
lying glueball spacetime spacing ranging spacing deconfinement employing variational ansatz torelon lightest functions. automatic build irreducible cubic group. channels. modest corrections. spurious couple torelon operators. byproduct couplings deconfinement pages tables figures. typos corrected unchanged matches versio
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non_dup
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2092950
|
10.1007/JHEP08(2010)121
|
We consider the possibility that the Higgs boson can act as a link to a
hidden sector in the context of pure-glue hidden valley models. In these models
the standard model is weakly coupled, through loops of heavy messengers fields,
to a hidden sector whose low energy dynamics is described by a pure-Yang-Mills
theory. Such a hidden sector contains several metastable hidden glueballs. In
this work we shall extend earlier results on hidden valleys to include
couplings of the messengers to the standard model Higgs sector. The effective
interactions at one-loop couple the hidden gluons to the standard model
particles through the Higgs sector. These couplings in turn induce hidden
glueball decays to fermion pairs, or cascade decays with multiple Higgs
emission. The presence of effective operators of different mass dimensions,
often competing with each other, together with a great diversity of states,
leads to a great variability in the lifetimes and decay modes of the hidden
glueballs. We find that most of the operators considered in this paper are not
heavily constrained by precision electroweak physics, therefore leaving plenty
of room in the parameter space to be explored by the future experiments at the
LHC.Comment: 44 pages, 16 figures. Major revision for JHEP, corrected an error in
Eq. 5.1, comments adde
|
Pure-glue hidden valleys through the Higgs portal
|
pure-glue hidden valleys through the higgs portal
|
boson hidden glue hidden valley models. weakly loops messengers hidden mills theory. hidden metastable hidden glueballs. extend hidden valleys couplings messengers sector. couple hidden gluons sector. couplings induce hidden glueball decays fermion cascade decays emission. competing great diversity great lifetimes hidden glueballs. heavily constrained precision electroweak leaving plenty room explored pages figures. revision jhep corrected comments adde
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non_dup
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[] |
2128955
|
10.1007/JHEP08(2010)122
|
We study phenomenological aspects of the holographic model of chiral symmetry
breaking recently introduced by Kuperstein and Sonnenschein (KS). As a first
step, we calculate the spectrum of vector and axial-vector mesons in the KS
model. We numerically compute various coupling constants of the mesons and
pions. Our analysis indicates that vector meson dominance is realized in this
model. The pion, vector meson and axial-vector meson form factors are obtained
and studied in detail. We find good agreement with QCD results. In particular,
the pion form factor closely matches available experimental data.Comment: v1: 27 pages, 9 figures, 4 tables; v2: minor changes, added more
general discussion of vector meson dominance; v3: minor changes and
additions, version accepted for publication in JHE
|
Pion and Vector Meson Form Factors in the Kuperstein-Sonnenschein
holographic model
|
pion and vector meson form factors in the kuperstein-sonnenschein holographic model
|
phenomenological holographic chiral breaking kuperstein sonnenschein axial mesons model. numerically mesons pions. meson dominance realized model. pion meson axial meson detail. results. pion closely matches pages tables minor meson dominance minor additions publication
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non_dup
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2130196
|
10.1007/JHEP08(2010)123
|
We obtain magnetic black-hole solutions in arbitrary $n(\ge 4)$ even
dimensions for an action given by the Einstein-Gauss-Bonnet-Maxwell-$\Lambda$
pieces with the $F^4$ gauge-correction terms. This action arises in the low
energy limit of heterotic string theory with constant dilaton and vanishing
higher form fields. The spacetime is assumed to be a warped product ${\ma
M}^{2} \times {\ma K}^{n-2}$, where ${\ma K}^{n-2}$ is a $(n-2)$-dimensional
Einstein space satisfying a condition on its Weyl tensor, originally considered
by Dotti and Gleiser. Under a few reasonable assumptions, we establish the
generalized Jebsen-Birkhoff theorem for the magnetic solution in the case where
the orbit of the warp factor on ${\ma K}^{n-2}$ is non-null. We prove that such
magnetic solutions do not exist in odd dimensions. In contrast, in even
dimensions, we obtain an explicit solution in the case where ${\ma K}^{n-2}$ is
a product manifold of $(n-2)/2$ two-dimensional maximally symmetric spaces with
the same constant warp factors. In this latter case, we show that the global
structure of the spacetime sharply depends on the existence of the
gauge-correction terms as well as the number of spacetime dimensions.Comment: 22 pages, 4 figures; v2, typos corrected, references added, style
changed, published version in JHE
|
Magnetic black holes with higher-order curvature and gauge corrections
in even dimensions
|
magnetic black holes with higher-order curvature and gauge corrections in even dimensions
|
einstein gauss bonnet maxwell lambda pieces terms. arises heterotic dilaton vanishing fields. spacetime warped einstein satisfying weyl originally dotti gleiser. reasonable assumptions establish jebsen birkhoff orbit warp null. dimensions. manifold maximally warp factors. spacetime sharply spacetime pages typos corrected style changed
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non_dup
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2118460
|
10.1007/JHEP08(2010)125
|
The two-Higgs-doublet model can be constrained by imposing Higgs-family
symmetries and/or generalized CP symmetries. It is known that there are only
six independent classes of such symmetry-constrained models. We study the CP
properties of all cases in the bilinear formalism. An exact symmetry implies CP
conservation. We show that soft breaking of the symmetry can lead to
spontaneous CP violation (CPV) in three of the classes.Comment: 14 pages, 2 tables, revised version adapted to the journal
publicatio
|
CP properties of symmetry-constrained two-Higgs-doublet models
|
cp properties of symmetry-constrained two-higgs-doublet models
|
doublet constrained imposing symmetries symmetries. constrained models. bilinear formalism. conservation. breaking spontaneous violation pages tables revised adapted publicatio
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non_dup
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2108412
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10.1007/JHEP08(2010)126
|
We consider the fist order, gradient-flow, description of the scalar fields
coupled to spherically symmetric, asymptotically flat black holes in extended
supergravities. Using the identification of the fake superpotential with
Hamilton's characteristic function we clarify some of its general properties,
showing in particular (besides reviewing the issue of its duality invariance)
that W has the properties of a Liapunov's function, which implies that its
extrema (associated with the horizon of extremal black holes) are
asymptotically stable equilibrium points of the corresponding first order
dynamical system (in the sense of Liapunov). Moreover, we show that the fake
superpotential W has, along the entire radial flow, the same flat directions
which exist at the attractor point. This allows to study properties of the ADM
mass also for small black holes where in fact W has no critical points at
finite distance in moduli space. In particular the W function for small non-BPS
black holes can always be computed analytically, unlike for the large
black-hole case.Comment: 30 pages, LaTeX source. Discussion on the radial evolution of the
scalar fields, in relation to the symmetries of the W-function, extended.
Table 1 added. Typos correcte
|
Fake Superpotential for Large and Small Extremal Black Holes
|
fake superpotential for large and small extremal black holes
|
fist spherically asymptotically holes supergravities. fake superpotential hamilton clarify besides reviewing duality invariance liapunov extrema horizon extremal holes asymptotically liapunov fake superpotential directions attractor point. holes moduli space. holes analytically unlike pages latex source. symmetries extended. added. typos correcte
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non_dup
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2103752
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10.1007/JHEP08(2010)127
|
We show that holographic composite Higgs Models with a discrete A4 symmetry
naturally predict hierarchical charged lepton masses and an approximate
tri-bimaximal lepton mixing with the correct scale of neutrino masses. They
also satisfy current constraints from electroweak precision tests, lepton
flavor violation and lepton mixing in a large region of parameter space. Two
phenomenologically relevant features arise in these models. First, an extra
suppression on the lepton Yukawa couplings makes the tau lepton more composite
than naively expected from its mass. As a consequence new light leptonic
resonances, with masses as low as few hundreds of GeV, large couplings to tau
and a very characteristic collider phenomenology, are quite likely. Second, the
discrete symmetry A4 together with the model structure provide a double-layer
of flavor protection that allows to keep tree-level mediated processes below
present experimental limits. One-loop processes violating lepton flavor, like
mu -> e gamma, may be however observable at future experiments.Comment: 39 pages, 1 figur
|
Neutrino Masses from an A4 Symmetry in Holographic Composite Higgs
Models
|
neutrino masses from an a4 symmetry in holographic composite higgs models
|
holographic composite naturally predict hierarchical lepton approximate bimaximal lepton masses. satisfy electroweak precision lepton flavor violation lepton space. phenomenologically arise models. extra suppression lepton yukawa couplings lepton composite naively mass. leptonic resonances hundreds couplings collider phenomenology likely. flavor protection keep limits. violating lepton flavor gamma observable pages figur
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non_dup
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[] |
2131226
|
10.1007/JHEP08(2010)128
|
Modeling QCD at large temperature with a simple holographic five dimensional
theory encoding minimal breaking of conformality, allows for the calculation of
all the transport coefficients, up to second order, in terms of a single
parameter. In particular, the shear and bulk relaxation times are provided. The
result follows by deforming the AdS background with a scalar dual to a
marginally relevant operator, at leading order in the deformation parameter.Comment: 11 pages; v2: comments and references adde
|
An elementary stringy estimate of transport coefficients of large
temperature QCD
|
an elementary stringy estimate of transport coefficients of large temperature qcd
|
holographic encoding breaking conformality parameter. relaxation provided. deforming marginally deformation pages comments adde
|
non_dup
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[] |
2128967
|
10.1007/JHEP08(2010)129
|
Minimal Flavour Violation (MFV) postulates that the only source of flavour
changing neutral currents and CP violation, as in the Standard Model, is the
CKM matrix. However it does not address the origin of fermion masses and mixing
and models that do usually have a structure that goes well beyond the MFV
framework. In this paper we compare the MFV predictions with those obtained in
models based on spontaneously broken (horizontal) family symmetries, both
Abelian and non-Abelian. The generic suppression of flavour changing processes
in these models turns out to be weaker than in the MFV hypothesis. Despite
this, in the supersymmetric case, the suppression may still be consistent with
a solution to the hierarchy problem, with masses of superpartners below 1 TeV.
A comparison of FCNC and CP violation in processes involving a variety of
different family quantum numbers should be able to distinguish between various
family symmetry models and models satisfying the MFV hypothesis.Comment: 34 pages, no figure
|
Beyond MFV in family symmetry theories of fermion masses
|
beyond mfv in family symmetry theories of fermion masses
|
flavour violation postulates flavour changing neutral currents violation matrix. fermion goes framework. spontaneously broken symmetries abelian abelian. generic suppression flavour changing turns weaker hypothesis. supersymmetric suppression hierarchy superpartners tev. fcnc violation involving distinguish satisfying pages
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non_dup
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[] |
2107993
|
10.1007/JHEP08(2010)130
|
Longitudinal double-spin asymmetries of charged hadrons with high transverse
momentum $p_T$ have been measured in electroproduction using the \hermes\
detector at \hera. Processes involving gluons in the nucleon have been enhanced
relative to others by selecting hadrons with $p_T$ typically above 1 GeV. In
this kinematic domain the gluon polarization has been extracted in leading
order making use of the model embedded in the Monte Carlo Generator \Pythia\
6.2. The gluon polarization obtained from single inclusive hadrons in the $p_T$
range 1 GeV $< p_T <$ 2.5 GeV using a deuterium target is $\frac{\Delta
g}{g}(\langle x\rangle, \langle \mu^2\rangle)=0.049\pm 0.034 (stat)\pm 0.010
(sys\textrm{-}exp)^{+0.126}_{-0.099}(sys\textrm{-}models)$ at a scale
$\la\mu^2\ra=1.35~{\rm GeV}^2$ and $\langle x\rangle = 0.22$. For different
final states and kinematic domains, consistent values of \DGG\ have been found
within statistical uncertainties using hydrogen and deuterium targets
|
Leading-Order Determination of the Gluon Polarization from high-$p_T$
Hadron Electroproduction
|
leading-order determination of the gluon polarization from high-$p_t$ hadron electroproduction
|
longitudinal asymmetries hadrons electroproduction hermes hera. involving gluons nucleon selecting hadrons gev. kinematic gluon embedded monte carlo generator pythia gluon inclusive hadrons deuterium frac delta langle rangle langle rangle stat textrm textrm langle rangle kinematic deuterium targets
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non_dup
|
[] |
2117945
|
10.1007/JHEP08(2010)132
|
A first quantised approach to loop amplitudes based on the pure spinor
particle is applied to the systematics of four-particle amplitudes in maximally
supersymmetric field theories. Counting of fermionic zero modes allows the
identification of momentum factors multiplying R**4 in the case of supergravity
(and F**4 in the Yang--Mills case) thereby making manifest their ultraviolet
properties as a function of dimension, D. For L=2,3,4 loops the leading
supergravity divergence is in D=4+6/L dimensions and proportional to d*2L R**4,
in line with earlier field theory calculations. However, at five loops there is
a radical change in the systematics, suggesting the presence of a contribution
with an explicit L=5 logarithmic ultraviolet divergence when D=24/5 that is
proportional to d*8 R**4. We further argue that d*8 R**4 should receive
contributions from all loops, which would imply that N=8 supergravity (with
D=4) is not protected by supersymmetry from a seven-loop divergence.Comment: 23 pages, 7 figures. Version published in journa
|
5 loops in 24/5 dimensions
|
5 loops in 24/5 dimensions
|
quantised amplitudes spinor systematics amplitudes maximally supersymmetric theories. counting fermionic multiplying supergravity mills thereby manifest ultraviolet loops supergravity divergence calculations. loops radical systematics logarithmic ultraviolet divergence argue receive loops imply supergravity protected supersymmetry seven pages figures. journa
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non_dup
|
[] |
2191649
|
10.1007/JHEP08(2011)002
|
We show that, the result recently reported by the CDF collaboration showing
an excess in the invariant mass distribution of jet pairs produced in
association with a W-boson can be explained by a simple extension of the
Standard Model (SM) with an additional quasi-inert Higgs doublet. The two
additional neutral Higgs states H^0 and A^0 have a mass of about 150 GeV and
decay into a pair of jets. W^\pm H^0/A^0 pairs are produced from the decay of
the heavier charged Higgs boson H^\pm. Depending on the precise masses of the
neutral and charged Higgs bosons, the model is shown to be in agreement with
constraints from electroweak precision tests and from flavor physics for a
broad range of the Standard Model-like Higgs mass from 100 GeV to several
hundreds of GeV. Other possible signals of this model at the Tevatron and the
LHC are discussed.Comment: 15 pages, 4 figure
|
W plus two jets from a quasi-inert Higgs doublet
|
w plus two jets from a quasi-inert higgs doublet
|
excess boson quasi inert doublet. neutral jets. heavier boson precise neutral bosons electroweak precision flavor broad hundreds gev. tevatron pages
|
non_dup
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[] |
2194453
|
10.1007/JHEP08(2011)007
|
We give a direct microscopic derivation of the F-theory background that
corresponds to four D7 branes of type I' theory by taking into account the
D-instanton contributions to the emission of the axio-dilaton field in the
directions transverse to the D7's. The couplings of the axio-dilaton to the
D-instanton moduli modify its classical source terms which are shown to be
proportional to the elements of the D7 brane chiral ring. Solving the bulk
field equations with the non-perturbatively corrected sources yields the full
F-theory background. This solution represents the gravitational dual of the
four-dimensional theory living on a probe D3 brane of type I', namely of the
N=2, Sp(1) SYM theory with Nf=4. Our results provide an explicit microscopic
derivation of the non-perturbative gravitational dual of this theory. They also
explain the recent observation that the exact coupling for this theory can be
entirely reconstructed from its perturbative part plus the knowledge of the
chiral ring on the D7 branes supporting its flavor degrees of freedom.Comment: Latex, 39 pages, 6 figure
|
Holographic non-perturbative corrections to gauge couplings
|
holographic non-perturbative corrections to gauge couplings
|
microscopic derivation branes instanton axio dilaton directions couplings axio dilaton instanton moduli modify brane chiral ring. solving perturbatively corrected background. gravitational living brane microscopic derivation perturbative gravitational theory. entirely reconstructed perturbative chiral branes supporting flavor latex pages
|
non_dup
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[] |
2192226
|
10.1007/JHEP08(2011)008
|
We generalize the framework introduced by Kapustin et al. for doing path
integral localization in Chern-Simons theory to work on any Seifert manifold.
This is done by topologically twisting the supersymmetric theory considered by
Kapustin et al., after which the theory takes a cohomological form. We also
consider Wilson loops which wrap the fiber directions and compute their
expectation values. We discuss the relation with other approaches to exact path
integral calculations in Chern-Simons theory.Comment: 36 pages; v2: minor corrections, matches the version published in
JHE
|
Cohomological localization of Chern-Simons theory
|
cohomological localization of chern-simons theory
|
generalize kapustin localization chern simons seifert manifold. topologically twisting supersymmetric kapustin cohomological form. wilson loops wrap fiber directions expectation values. chern simons pages minor matches
|
non_dup
|
[] |
144258680
|
10.1007/JHEP08(2011)009
|
Recent works have demonstrated that one can construct a (d + 2) dimensional solution of the vacuum Einstein equations that is dual to a (d + 1) dimensional fluid satisfying the incompressible Navier-Stokes equations. In one important example, the fluid lives on a fixed timelike surface in the flat Rindler spacetime associated with an accelerated observer. In this paper, we show that the shear viscosity to entropy density ratio of the fluid takes the universal value 1/4 pi in a wide class of higher curvature generalizations to Einstein gravity. Unlike the fluid dual to asymptotically anti-de Sitter spacetimes, here the choice of gravitational dynamics only affects the second order transport coefficients. We explicitly calculate these in five-dimensional Einstein-Gauss-Bonnet gravity and discuss the implications of our results
|
Higher Curvature Gravity and the Holographic fluid dual to flat spacetime
|
higher curvature gravity and the holographic fluid dual to flat spacetime
|
einstein satisfying incompressible navier stokes equations. lives timelike rindler spacetime accelerated observer. viscosity universal curvature generalizations einstein gravity. unlike asymptotically sitter spacetimes gravitational affects coefficients. explicitly einstein gauss bonnet
|
non_dup
|
[] |
11284731
|
10.1007/JHEP08(2011)010
|
The thrust distribution in electron-positron annihilation is a classical precision QCD observable. Using renormalization group (RG) evolution in Laplace space, we perform the resummation of logarithmically enhanced corrections in the dijet limit, T → 1 to next-to-next-to-leading logarithmic (NNLL) accuracy. We independently derive the two-loop soft function for the thrust distribution and extract an analytical expression for the NNLL resummation coefficient g 3. Our findings confirm earlier NNLL resummation results for the thrust distribution in soft-collinear effective theory. To combine the resummed expressions with the fixed-order results, we derive the log( R)-matching and R-matching of the NNLL approximation to the fixed-order NNLO distribution
|
Two-loop soft corrections and resummation of the thrust distribution in the dijet region
|
two-loop soft corrections and resummation of the thrust distribution in the dijet region
|
thrust positron annihilation precision observable. renormalization laplace resummation logarithmically dijet logarithmic nnll accuracy. independently derive thrust extract nnll resummation confirm nnll resummation thrust collinear theory. combine resummed expressions derive matching matching nnll nnlo
|
non_dup
|
[] |
2179896
|
10.1007/JHEP08(2011)012
|
Results for the two real parton differential distributions needed for
implementing a next-to-leading order (NLO) parton shower Monte Carlo are
presented. They are also integrated over the phase space in order to provide
solid numerical control of the MC codes and for the discussion of the
differences between the standard $\bar{MS}$ factorization and Monte Carlo
implementation at the level of inclusive NLO evolution kernels. Presented
results cover the class of non-singlet diagrams entering into NLO kernels. The
classic work of Curci-Furmanski-Pertonzio was used as a guide in the
calculations.Comment: 34 pages, 3 figure
|
Two real parton contributions to non-singlet kernels for exclusive QCD
DGLAP evolution
|
two real parton contributions to non-singlet kernels for exclusive qcd dglap evolution
|
parton implementing parton shower monte carlo presented. codes factorization monte carlo inclusive kernels. cover singlet diagrams entering kernels. classic curci furmanski pertonzio guide pages
|
non_dup
|
[] |
2155194
|
10.1007/JHEP08(2011)014
|
The spinor helicity formalism in four dimensions has become a very useful
tool both for understanding the structure of amplitudes and also for practical
numerical computation of amplitudes. Recently, there has been some discussion
of an extension of this formalism to higher dimensions. We describe a
particular implementation of the spinor-helicity method in ten dimensions.
Using this tool, we study the tree-level S-matrix of ten dimensional super
Yang-Mills theory, and prove that the theory enjoys a dual conformal symmetry.
Implications for four-dimensional computations are discussed.Comment: 24 pages, 1 figure
|
Spinor Helicity and Dual Conformal Symmetry in Ten Dimensions
|
spinor helicity and dual conformal symmetry in ten dimensions
|
spinor helicity formalism amplitudes practical amplitudes. formalism dimensions. spinor helicity dimensions. super mills enjoys conformal symmetry. computations pages
|
non_dup
|
[] |
2194344
|
10.1007/JHEP08(2011)015
|
As a step towards understanding the in-medium evolution of a hard jet, we
consider the interference pattern for the medium induced gluon radiation
produced by a color singlet quark-antiquark antenna embedded in a QCD medium
with size L. We focus on the typical kinematics for medium-induced gluon
radiation in the BDMPS-Z regime, that is, short formation times \tau_f << L and
relatively large emission angles \theta >>\theta_c = 2/\sqrt{\hat q L^3}, with
\hat q the `jet quenching' parameter. We demonstrate that, for a dipole opening
angle \theta_{q\bar q} larger than \theta_c, the interference between the
medium-induced gluon emissions by the quark and the antiquark is parametrically
suppressed with respect to the corresponding direct emissions. Physically, this
is so since the direct emissions can be delocalized anywhere throughout the
medium and thus yield contributions proportional to L. On the contrary, the
interference occurs only between gluons emitted at very early times, within the
characteristic time scales for quantum and color coherence between the two
emitters, which in this regime are much smaller than L. This implies that, for
\theta_{q\bar q} >> \theta_c, the medium-induced radiation by the dipole is
simply the sum of the two BDMPS-Z spectra individually produced by the quark
and the antiquark, without coherence effects like angular ordering. For
\theta_{q\bar q} << \theta_c, the BDMPS-Z radiation by the dipole vanishes.Comment: 47 pages, 7 figures. Improved physical discussion in Sect. 2. New
section added (Sect. 6) on possible implications for in-medium jet evolution.
More references added. Conclusions unchange
|
Interference effects in medium-induced gluon radiation
|
interference effects in medium-induced gluon radiation
|
interference gluon singlet antiquark antenna embedded kinematics gluon bdmps angles theta theta sqrt quenching parameter. dipole opening theta theta interference gluon antiquark parametrically suppressed emissions. physically delocalized anywhere contrary interference gluons emitted coherence emitters theta theta dipole bdmps individually antiquark coherence ordering. theta theta bdmps dipole pages figures. sect. sect. evolution. added. unchange
|
non_dup
|
[] |
2141415
|
10.1007/JHEP08(2011)016
|
A benchmark CP-violating supersymmetric scenario (known as 'CPX-scenario' in
the literature) is studied in the context of the Large Hadron Collider (LHC).
It is shown that the LHC, with low to moderate accumulated luminosity, will be
able to probe the existing `hole' in the $m_{h_1}$-$\tan\beta$ plane, which
cannot be ruled out by the LEP data. We explore the parameter space with
cascade decay of third generation squarks and gluino with CP-violating decay
branching fractions. We propose a multi-channel analysis to probe this
parameter space some of which are background free at an integrated luminosity
of 5-10 fb$^{-1}$. Specially, multi-lepton final states ($3\l,\, 4\l$ and like
sign di-lepton) are almost background free and have $5\sigma$ reach for the
corresponding signals with very early data of LHC for both 14 TeV and 7 TeV
center of mass energy.Comment: 24 pages, 9 figures, references added as in the journal versio
|
Higgs production in CP-violating supersymmetric cascade decays: probing
the `open hole' at the Large Hadron Collider
|
higgs production in cp-violating supersymmetric cascade decays: probing the `open hole' at the large hadron collider
|
benchmark violating supersymmetric hadron collider moderate accumulated luminosity beta ruled data. explore cascade squarks gluino violating branching fractions. propose luminosity specially lepton lepton sigma pages versio
|
non_dup
|
[] |
2097575
|
10.1007/JHEP08(2011)018
|
The Cryogenic Dark Matter Search recently announced the observation of two
signal events with a 77% confidence level. Although statistically inconclusive,
it is nevertheless suggestive. In this work we present a model-independent
analysis on the implication of a positive signal in dark matter scattering off
nuclei. Assuming the interaction between (scalar, fermion or vector) dark
matter and the standard model induced by unknown new physics at the scale
$\Lambda$, we examine various dimension-6 tree-level induced operators and
constrain them using the current experimental data, e.g. the WMAP data of the
relic abundance, CDMS II direct detection of the spin-independent scattering,
and indirect detection data (Fermi LAT cosmic gamma-ray), etc. Finally, the LHC
reach is also explored
|
Effective Dark Matter Model: Relic density, CDMS II, Fermi LAT and LHC
|
effective dark matter model: relic density, cdms ii, fermi lat and lhc
|
cryogenic announced confidence level. statistically inconclusive nevertheless suggestive. implication nuclei. fermion unknown lambda examine constrain e.g. wmap relic abundance cdms indirect fermi cosmic gamma etc. explored
|
non_dup
|
[] |
2192278
|
10.1007/JHEP08(2011)021
|
We suggest simple models of spontaneous parity violation in supersymmetric
strong gauge theory. We focus on left-right symmetric model and investigate
vacuum with spontaneous parity violation. Non-perturbative effects are
calculable in supersymmetric gauge theory, and we suggest two new models. The
first model shows confinement, and the second model has a dual description of
the theory. The left-right symmetry breaking and electroweak symmetry breaking
are simultaneously occurred with the suitable energy scale hierarchy. The
second model also induces spontaneous supersymmetry breaking.Comment: 14 page
|
Spontaneous Parity Violation in SUSY Strong Gauge Theory
|
spontaneous parity violation in susy strong gauge theory
|
spontaneous parity violation supersymmetric theory. spontaneous parity violation. perturbative calculable supersymmetric models. confinement theory. breaking electroweak breaking simultaneously occurred hierarchy. induces spontaneous supersymmetry
|
non_dup
|
[] |
2195313
|
10.1007/JHEP08(2011)026
|
The magnetized pure pion gradient ($\mathcal{5}\phi$) phase in the deconfined
Sakai-Sugimoto model is explored at zero and finite temperature. We found that
the temperature has very small effects on the phase. The thermodynamical
properties of the phase shows that the excitations behave like a scalar
solitonic free particles. By comparing the free energy of the pion gradient
phase to the competing multiquark-pion gradient (MQ-$\mathcal{5}\phi$) phase,
it becomes apparent that the pure pion gradient is less thermodynamically
preferred than the MQ-$\mathcal{5}\phi$ phase. However, in the parameter space
where the baryonic chemical potential is smaller than the onset value of the
multiquark, the dominating magnetized nuclear matter is the pion gradient
phase.Comment: 20 pages, 9 figure
|
Magnetized Domain Walls in the Deconfined Sakai-Sugimoto Model at Finite
Baryon Density
|
magnetized domain walls in the deconfined sakai-sugimoto model at finite baryon density
|
magnetized pion mathcal deconfined sakai sugimoto explored temperature. phase. thermodynamical excitations behave solitonic particles. pion competing multiquark pion mathcal apparent pion thermodynamically preferred mathcal phase. baryonic onset multiquark dominating magnetized pion pages
|
non_dup
|
[] |
71039696
|
10.1007/JHEP08(2011)027
|
In the present work a two-component dark matter model is studied adopting the degenerate scenario in the R-parity conserving NMSSM. The gravitino LSP and the neutralino NLSP are extremely degenerate in mass, avoiding the BBN bounds and obtaining a high reheating temperature for thermal leptogenesis. In this model both gravitino (absolutely stable) and neutralino (quasi-stable) contribute to dark matter, and direct detection searches for neutralino are discussed. Points that survive all the constraints correspond to a singlino-like neutralino
|
Direct neutralino searches in the NMSSM with gravitino LSP in the degenerate scenario
|
direct neutralino searches in the nmssm with gravitino lsp in the degenerate scenario
|
adopting degenerate parity conserving nmssm. gravitino neutralino nlsp extremely degenerate avoiding bounds obtaining reheating leptogenesis. gravitino absolutely neutralino quasi searches neutralino discussed. survive singlino neutralino
|
non_dup
|
[] |
2182884
|
10.1007/JHEP08(2011)031
|
The CDF collaboration has recently reported a large deviation from the
standard model of the t \bar t forward-backward asymmetry in the high invariant
mass region. We interpret this measurement as coming from new physics at a
heavy scale Lambda, and perform a model-independent analysis up to
O(1/Lambda^4). A simple formalism to test and constrain models of new physics
is provided. We find that a large asymmetry cannot be accommodated by heavy new
physics that does not interfere with the standard model. We show that a smoking
gun test for the heavy new physics hypothesis is a significant deviation from
the standard model prediction for the t \bar t differential cross section at
large invariant mass. At M_{t\bar t}>1 TeV the cross section is predicted to be
at least twice that of the SM at the Tevatron, and for M_{t\bar t}>1.5 TeV at
least three times larger than the SM at the LHC.Comment: 12 pages, 3 figures. v2: Minor corrections in the text, references
added. v3: Extended discussion on QCD NLO corrections, added short discussion
on LHC dijet constraints; matches published versio
|
Implications of the CDF t \bar t Forward-Backward Asymmetry for Hard Top
Physics
|
implications of the cdf t \bar t forward-backward asymmetry for hard top physics
|
backward asymmetry region. interpret coming lambda lambda formalism constrain provided. asymmetry accommodated interfere model. smoking mass. twice tevatron pages figures. minor added. dijet matches versio
|
non_dup
|
[] |
2193256
|
10.1007/JHEP08(2011)033
|
We study a new type of CP violating observable that arises in three body
decays that are dominated by an intermediate resonance. If two interfering
diagrams exist with different orderings of final state particles, the required
CP-even phase arises due to the different virtualities of the resonance in each
of the two diagrams. This method can be an important tool for accessing new CP
phases at the LHC and future colliders.Comment: 22 pages, v2: discussion of charged particle decays and a few
references added v3: typos corrected, matches published versio
|
A new CP violating observable for the LHC
|
a new cp violating observable for the lhc
|
violating observable arises decays dominated resonance. interfering diagrams orderings arises virtualities diagrams. accessing pages decays typos corrected matches versio
|
non_dup
|
[] |
2130179
|
10.1007/JHEP08(2011)035
|
We study a supersymmetry breaking deformation of the M-theory background
found in arXiv:hep-th/0012011. The supersymmetric solution is a warped product
of R^{2,1} and the 8-dimensional Stenzel space, which is a higher dimensional
generalization of the deformed conifold. At the bottom of the warped throat
there is a 4-sphere threaded by \tilde{M} units of 4-form flux. The dual
(2+1)-dimensional theory has a discrete spectrum of bound states. We add p
anti-M2 branes at a point on the 4-sphere, and show that they blow up into an
M5-brane wrapping a 3-sphere at a fixed azimuthal angle on the 4-sphere. This
supersymmetry breaking state turns out to be metastable for p / \tilde{M} <
0.054. We find a smooth O(3)-symmetric Euclidean bounce solution in the
M5-brane world volume theory that describes the decay of the false vacuum.
Calculation of the Euclidean action shows that the metastable state is
extremely long-lived. We also describe the corresponding metastable states and
their decay in the type IIA background obtained by reduction along one of the
spatial directions of R^{2,1}.Comment: 33 pages, 5 figures; v2 note adde
|
M-Branes and Metastable States
|
m-branes and metastable states
|
supersymmetry breaking deformation supersymmetric warped stenzel generalization deformed conifold. warped throat sphere threaded tilde flux. states. branes sphere blow brane wrapping sphere azimuthal sphere. supersymmetry breaking turns metastable tilde euclidean bounce brane describes false vacuum. euclidean metastable extremely lived. metastable directions .comment pages adde
|
non_dup
|
[] |
2184732
|
10.1007/JHEP08(2011)037
|
We construct superfluid black hole solutions with two chemical potentials. By
analogy with QCD, the two chemical potentials correspond to the baryon and
isospin symmetries, respectively. We consider two systems: the back-reacted
U(2) Einstein-Yang-Mills theory in 4+1 dimensions and the 9+1-dimensional D3/D7
brane setup with two coincident D7-brane probes. In the D7-brane model, the
identification of baryon and isospin chemical potential is explicit since the
dual field theory is explicitly known. Studying the phase diagram, we find in
both systems a quantum phase transition at a critical ratio of the two chemical
potentials. However the quantum phase transition is different in the two
systems: In the D3/D7 brane setup we always find a second order phase
transition, while in the Einstein-Yang-Mills theory, depending on the strength
of the back-reaction, we obtain a continuous or first order transition. We
expect the continuous quantum phase transition to be BKT-like. We comment on
the origin of this differing behavior in these apparently very similar models
and compare to phenomenological systems.Comment: 33 pages, 10 pdf files in 6 figures, v2: Discussion of D3/D7 setup at
zero temperature revise
|
Holographic Superfluidity in Imbalanced Mixtures
|
holographic superfluidity in imbalanced mixtures
|
superfluid potentials. analogy potentials baryon isospin symmetries respectively. reacted einstein mills brane setup coincident brane probes. brane baryon isospin explicitly known. studying potentials. brane setup einstein mills transition. like. comment differing apparently phenomenological pages files setup revise
|
non_dup
|
[] |
2194365
|
10.1007/JHEP08(2011)038
|
We consider theories of flavored dark matter, in which the dark matter
particle is part of a multiplet transforming nontrivially under the flavor
group of the Standard Model in a manner consistent with the principle of
Minimal Flavor Violation (MFV). MFV automatically leads to the stability of the
lightest state for a large number of flavor multiplets. If neutral, this
particle is an excellent dark matter candidate. Furthermore, MFV implies
specific patterns of mass splittings among the flavors of dark matter and
governs the structure of the couplings between dark matter and ordinary
particles, leading to a rich and predictive cosmology and phenomenology. We
present an illustrative phenomenological study of an effective theory of a
flavor SU(3)_Q triplet, gauge singlet scalar.Comment: 10 pages, 2 figures; v2: references added, minor changes to collider
analysis, conclusions unchange
|
Dark Matter from Minimal Flavor Violation
|
dark matter from minimal flavor violation
|
flavored multiplet transforming nontrivially flavor manner flavor violation automatically lightest flavor multiplets. neutral excellent candidate. splittings flavors governs couplings ordinary predictive cosmology phenomenology. illustrative phenomenological flavor triplet singlet pages minor collider unchange
|
non_dup
|
[] |
2180553
|
10.1007/JHEP08(2011)041
|
We find infinite families of supersymmetric solutions of four dimensional,
N=2 gauged supergravity with Lifshitz, Schrodinger and also AdS symmetries. We
focus on the canonical example of a single hypermultiplet and a single vector
multiplet and find that the spectrum of solutions depends crucially on whether
the gaugings are electric or magnetic but to a far milder extent on the
strength of the gaugings. For purely electric or purely magnetic gaugings we
generically find Lifshitz solutions, while for a mixed gauging we find
Schrodinger and AdS solutions. For some of the gaugings the theory has a known
lift to string/M-theory thus giving a higher dimensional embedding of our
solutions.Comment: 27 pages, v2 refs added, comments regarding string embeddings
altered, cleaner discussion of the scaling parameter for Schrodinger
solutions; v3 published version, refs adde
|
Non-Relativistic Solutions of N=2 Gauged Supergravity
|
non-relativistic solutions of n=2 gauged supergravity
|
infinite families supersymmetric gauged supergravity lifshitz schrodinger symmetries. canonical hypermultiplet multiplet crucially gaugings milder gaugings. purely purely gaugings generically lifshitz gauging schrodinger solutions. gaugings lift giving embedding pages refs comments embeddings altered cleaner schrodinger refs adde
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non_dup
|
[] |
2162350
|
10.1007/JHEP08(2011)045
|
We examine the gluon scattering amplitude in N=4 super Yang-Mills at finite
temperature with nonzero R-charge densities, and in Non-Commutative gauge
theory at finite temperature. The gluon scattering amplitude is defined as a
light-like Wilson loop which lives at the horizon of the T-dual black holes of
the backgrounds we consider. We study in detail a special amplitude, which
corresponds to forward scattering of a low energy gluon off a high energy one.
For this kinematic configuration in the considered backgrounds, we find the
corresponding minimal surface which is directly related to the gluon scattering
amplitude. We find that for increasing the chemical potential or the
non-commutative parameter, the on-shell action corresponding to our Wilson loop
in the T-dual space decreases. For all of our solutions the length of the short
side of the Wilson loop is constrained by an upper bound which depends on the
temperature, the R-charge density and the non-commutative parameter. Due to
this constraint, in the limit of zeroth temperature our approach breaks down
since the upper bound goes to zero, while by keeping the temperature finite and
letting the chemical potential or the non-commutative parameter to approach to
zero the limit is smooth.Comment: 30 pages, 16 figures, minor corrections (plus improved numerical
computation for the non-commutative case
|
Gluon Scattering Amplitudes in Finite Temperature Gauge/Gravity
Dualities
|
gluon scattering amplitudes in finite temperature gauge/gravity dualities
|
examine gluon super mills nonzero densities commutative temperature. gluon wilson lives horizon holes backgrounds consider. gluon one. kinematic backgrounds gluon amplitude. commutative wilson decreases. wilson constrained commutative parameter. zeroth breaks goes keeping letting commutative pages minor commutative
|
non_dup
|
[] |
2183115
|
10.1007/JHEP08(2011)053
|
The hard-thermal-loop perturbation theory (HTLpt) framework is used to
calculate the thermodynamic functions of a quark-gluon plasma to three-loop
order. This is the highest order accessible by finite temperature perturbation
theory applied to a non-Abelian gauge theory before the high-temperature
infrared catastrophe. All ultraviolet divergences are eliminated by
renormalization of the vacuum, the HTL mass parameters, and the strong coupling
constant. After choosing a prescription for the mass parameters, the three-loop
results for the pressure and trace anomaly are found to be in very good
agreement with recent lattice data down to $T \sim 2-3\,T_c$, which are
temperatures accessible by current and forthcoming heavy-ion collision
experiments.Comment: 27 pages, 11 figures; corresponds with published version in JHE
|
Three-loop HTL QCD thermodynamics
|
three-loop htl qcd thermodynamics
|
perturbation htlpt thermodynamic gluon order. accessible perturbation abelian infrared catastrophe. ultraviolet divergences eliminated renormalization constant. choosing prescription trace anomaly accessible forthcoming collision pages
|
non_dup
|
[] |
2122109
|
10.1007/JHEP08(2011)059
|
We study the possibility to measure sin^2 theta_W by neutrino-electron
scattering at a value of the momentum transfer Q ~ 30 MeV with a precision of
0.24% which is only a factor three below the one obtained by LEP-I at the
Z-pole. The neutrino source is a proton beam dump providing a clean beam from
muon decay at rest and the detector is a 100 kt scale water Cerenkov detector,
which results in about 20 million signal events.Comment: 5 pages, 5 eps figures, 3 tables. Title changed. Detailed discussion
on the proposed set-up and the dependence of the expected precision on the
energy resolution and the exposure added. Conclusions unchanged. To appear in
JHE
|
Potential measurement of the weak mixing angle with neutrino-electron
scattering at low energy
|
potential measurement of the weak mixing angle with neutrino-electron scattering at low energy
|
theta precision pole. proton dump clean muon cerenkov million pages tables. title changed. precision added. unchanged.
|
non_dup
|
[] |
2194238
|
10.1007/JHEP08(2011)060
|
The singlet scalar model is a minimal extension of the Standard Model that
can explain the dark matter. We point out that in this model the dark matter
constraint can be satisfied not only in the already considered WIMP regime but
also, for much smaller couplings, in the Feebly Interacting Massive Particle
(FIMP) regime. In it, dark matter particles are slowly produced in the early
Universe but are never abundant enough to reach thermal equilibrium or
annihilate among themselves. This alternative framework is as simple and
predictive as the WIMP scenario but it gives rise to a completely different
dark matter phenomenology. After reviewing the calculation of the dark matter
relic density in the FIMP regime, we study in detail the evolution of the dark
matter abundance in the early Universe and the predicted relic density as a
function of the parameters of the model. A new dark matter compatible region of
the singlet model is identified, featuring couplings of order 10^-11 to 10^-12
for singlet masses in the GeV to TeV range. As a consequence, no signals at
direct or indirect detection experiments are expected. The relevance of this
new viable region for the correct interpretation of recent experimental bounds
is emphasized.Comment: 12 pages, 6 figure
|
The singlet scalar as FIMP dark matter
|
the singlet scalar as fimp dark matter
|
singlet matter. satisfied wimp couplings feebly interacting massive fimp regime. slowly universe never abundant annihilate themselves. predictive wimp phenomenology. reviewing relic fimp abundance universe relic model. compatible singlet featuring couplings singlet range. indirect expected. relevance viable bounds pages
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non_dup
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[] |
2193024
|
10.1007/JHEP08(2011)064
|
In this note, we consider confining gauge theories in $D=2,3,4$ defined by
$S^2$ or $T^2$ compactification of higher-dimensional conformal field theories
with gravity duals. We investigate the behavior of these theories on de Sitter
spacetime as a function of the Hubble parameter. We find that in each case, the
de Sitter vacuum state of the field theory (defined by Euclidian continuation
from a sphere) undergoes a deconfinement transition as the Hubble parameter is
increased past a critical value. In each case, the corresponding critical de
Sitter temperature is smaller than the corresponding Minkowski-space
deconfinement temperature by a factor nearly equal to the dimension of the de
Sitter spacetime. The behavior is qualitatively and quantitatively similar to
that for confining theories defined by $S^1$ compactification of CFTs, studied
recently in arXiv:1007.3996.Comment: 25 pages, 7 figure
|
Acceleration-Induced Deconfinement Transitions in de Sitter Spacetime
|
acceleration-induced deconfinement transitions in de sitter spacetime
|
confining compactification conformal duals. sitter spacetime hubble parameter. sitter euclidian continuation sphere undergoes deconfinement hubble value. sitter minkowski deconfinement nearly sitter spacetime. qualitatively quantitatively confining compactification cfts pages
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non_dup
|
[] |
2192802
|
10.1007/JHEP08(2011)066
|
We construct a class of operators, given by Schur polynomials, in ABJM
theory. By computing two point functions at finite $N$ we confirm these are
diagonal for this class of operators in the free field limit. We also calculate
exact three and multi point correlators in the zero coupling limit. Finally, we
consider a particular nontrivial background produced by an operator with an
$R$-charge of $O(N^2$. We show that the nonplanar corrections (which can no
longer be neglected, even at large $N$) can be resummed to give a $1/(N+M)$
expansion for correlators computed in this background.Comment: 21 pages, 1 figure, revised version, large N expansion is corrected,
to appear JHE
|
Exact Large R-charge Correlators in ABJM Theory
|
exact large r-charge correlators in abjm theory
|
schur polynomials abjm theory. confirm diagonal limit. correlators limit. nontrivial nonplanar neglected resummed correlators pages revised corrected
|
non_dup
|
[] |
2167760
|
10.1007/JHEP08(2011)070
|
We establish explicitely the relation between the algebraic and Nambu-Goto
strings when the target space is a four dimensional flat space. We find that
the two theories are exactly equivalent only when the algebraic string is
restricted to the self-dual or anti self-dual sectors. In its Hamiltonian
formulation, the algebraic string defines a constrained system with first and
second class constraints. In the self-dual case, we exhibit the appropriate set
of second class constraints such that the resulting physical phase space is
formulated in the same way as it is in the standard Nambu-Goto string. We
conclude with a discussion on alternative quantisation schemes.Comment: 20 page
|
Equivalence of the self-dual and Nambu-Goto strings
|
equivalence of the self-dual and nambu-goto strings
|
establish explicitely algebraic nambu goto strings space. algebraic restricted sectors. formulation algebraic defines constrained constraints. exhibit formulated nambu goto string. quantisation
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non_dup
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[] |
28938434
|
10.1007/JHEP08(2011)073
|
We present a new mechanism for transferring a pre-existing lepton or baryon asymmetry to a dark matter asymmetry that relies on mass mixing which is dynamically induced in the early universe. Such mixing can succeed with only generic scales and operators and can give rise to distinctive relationships between the asymmetries in the two sectors. The mixing eliminates the need for the type of additional higher-dimensional operators that are inherent to many current asymmetric dark matter models. We consider several implementations of this idea. In one model, mass mixing is temporarily induced during a two-stage electroweak phase transition in a two Higgs doublet model. In the other class of models, mass mixing is induced by large field vacuum expectation values at high temperatures — either moduli fields or even more generic kinetic terms. Mass mixing models of this type can readily accommodate asymmetric dark matter masses ranging from 1 GeV to 100 TeV and expand the scope of possible relationships between the dark and visible sectors in such models.Physic
|
Emergent Dark Matter, Baryon, and Lepton Numbers
|
emergent dark matter, baryon, and lepton numbers
|
transferring lepton baryon asymmetry asymmetry relies dynamically universe. succeed generic distinctive asymmetries sectors. eliminates inherent asymmetric models. implementations idea. temporarily electroweak doublet model. field expectation moduli fields generic terms. readily accommodate asymmetric ranging expand scope visible sectors models.physic
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non_dup
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[] |
2193857
|
10.1007/JHEP08(2011)074
|
We investigate and clarify the mutual compatibility of the higher order
corrections arising in supergravity and string theory effective actions and the
non-linear duality symmetries of these theories. Starting from a conventional
tree level action leading to duality invariant equations of motion, we show how
to accommodate duality invariant counterterms given as functionals of both
electric and magnetic fields in a perturbative expansion, and to deduce from
them a non-polynomial bona fide action satisfying the Gaillard-Zumino
constraint. There exists a corresponding consistency constraint in the
non-covariant Henneaux-Teitelboim formalism which ensures that one can always
restore diffeomorphism invariance by perturbatively solving this functional
identity. We illustrate how this procedure works for the R^2 \nabla F \nabla F
and F^4 counterterms in Maxwell theory.Comment: 15 page
|
Counterterms vs. Dualities
|
counterterms vs. dualities
|
clarify mutual compatibility arising supergravity duality symmetries theories. duality accommodate duality counterterms functionals perturbative deduce bona fide satisfying gaillard zumino constraint. consistency covariant henneaux teitelboim formalism ensures restore diffeomorphism invariance perturbatively solving identity. illustrate nabla nabla counterterms maxwell
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non_dup
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[] |
2193064
|
10.1007/JHEP08(2011)079
|
Using the fact the BTZ black hole is a quotient of AdS_3 we show that
classical string propagation in the BTZ background is integrable. We construct
the flat connection and its monodromy matrix which generates the non-local
charges. From examining the general behaviour of the eigen values of the
monodromy matrix we determine the set of integral equations which constrain
them. These equations imply that each classical solution is characterized by a
density function in the complex plane. For classical solutions which correspond
to geodesics and winding strings we solve for the eigen values of the monodromy
matrix explicitly and show that geodesics correspond to zero density in the
complex plane. We solve the integral equations for BMN and magnon like
solutions and obtain their dispersion relation. Finally we show that the set of
integral equations which constrain the eigen values of the monodromy matrix can
be identified with the continuum limit of the Bethe equations of a twisted
SL(2, R) spin chain at one loop.Comment: 45 pages, Reference added, typos corrected, discussion on geodesics
improved to include all geodesic
|
Classical integrability in the BTZ black hole
|
classical integrability in the btz black hole
|
quotient propagation integrable. connection monodromy generates charges. examining eigen monodromy constrain them. imply plane. geodesics winding strings solve eigen monodromy explicitly geodesics plane. solve magnon relation. constrain eigen monodromy continuum bethe twisted pages typos corrected geodesics geodesic
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non_dup
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[] |
2191260
|
10.1007/JHEP08(2011)081
|
The construction of supersymmetric invariant actions on a spacetime manifold
with a boundary is carried out using the "ectoplasm" formalism for the
construction of closed forms in superspace. Non-trivial actions are obtained
from the pull-backs to the bosonic bodies of closed but non-exact forms in
superspace; finding supersymmetric invariants thus becomes a cohomology
problem. For a spacetime with a boundary, the appropriate mathematical language
changes to relative cohomology, which we use to give a general formulation of
off-shell supersymmetric invariants in the presence of boundaries. We also
relate this construction to the superembedding formalism for the construction
of brane actions, and we give examples with bulk spacetimes of dimension 3, 4
and 5. The closed superform in the 5D example needs to be constructed as a
Chern-Simons type of invariant, obtained from a closed 6-form displaying Weil
triviality.Comment: 25 page
|
Ectoplasm with an Edge
|
ectoplasm with an edge
|
supersymmetric spacetime manifold ectoplasm formalism superspace. trivial pull backs bosonic bodies superspace supersymmetric invariants cohomology problem. spacetime mathematical cohomology formulation supersymmetric invariants boundaries. relate superembedding formalism brane spacetimes superform chern simons displaying weil
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non_dup
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[] |
2098581
|
10.1007/JHEP08(2011)082
|
In this note we study vector fluctuations over the Klebanov-Strassler type
IIB supergravity solution that are even under the I-conjugation. We are
interested only in the states invariant under the global SU(2)x SU(2) symmetry.
Apart from the glueball dual to the R-current there is one more 1++ state,
which is a member of a massive vector multiplet containing also a scalar 0++.
Combined with previous results, our analysis allows to complete the list of low
energy singlet supermultiplets in the Klebanov-Strassler theory.Comment: 12 pages, 2 figure
|
On I-even Singlet Glueballs in the Klebanov-Strassler Theory
|
on i-even singlet glueballs in the klebanov-strassler theory
|
klebanov strassler supergravity conjugation. interested symmetry. apart glueball member massive multiplet singlet supermultiplets klebanov strassler pages
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non_dup
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[] |
2191822
|
10.1007/JHEP08(2011)090
|
Breitenlohner, Maison and Gibbons claimed some time ago that all bona-fide
four dimensional asymptotically flat non-degenerate black holes are in a
symmetry orbit of the Schwarzschild/Kerr black hole in a large set of theories
of gravity and matter. Their argument involved reducing the theory on a
time-like Killing vector field and analysing the resulting three dimensional
sigma model of maps to a symmetric space $G/H$. In the construction of their
proof, they conjectured the existence of a suitable $H$-transformation that
always remove the electromagnetic charges of the four dimensional black hole
solution. We show in this short note that such a transformation does not exist
in general, and discuss a set of boundary conditions on the horizon for the
scalar fields in the sigma model that yield black holes for which the result by
Breitenlohner, Maison and Gibbons can be applied.Comment: 8 page
|
On the symmetry orbits of black holes in non-linear sigma models
|
on the symmetry orbits of black holes in non-linear sigma models
|
breitenlohner maison gibbons claimed bona fide asymptotically degenerate holes orbit schwarzschild kerr matter. argument reducing killing analysing sigma conjectured remove electromagnetic charges solution. horizon sigma holes breitenlohner maison gibbons
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non_dup
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[] |
2190973
|
10.1007/JHEP08(2011)092
|
We study analytical properties of the five-loop anomalous dimension of
twist-2 operators at negative even values of Lorentz spin. Following L. N.
Lipatov and A. I. Onishchenko, we have found two possible generalizations of
double-logarithmic equation, which allow to predict a lot of poles of anomalous
dimension of twist-2 operators at all orders of perturbative theory from the
known results. Second generalization is related with the reciprocity-respecting
function, which is a single-logarithmic function in this case. We have found,
that the knowledge of first orders of the reciprocity-respecting function gives
all-loop predictions for the highest poles. Obtained predictions can be used
for the reconstruction of a general form of the wrapping corrections for
twist-2 operators.Comment: 17 pages, references adde
|
Double-logs, Gribov-Lipatov reciprocity and wrapping
|
double-logs, gribov-lipatov reciprocity and wrapping
|
anomalous twist lorentz spin. lipatov onishchenko generalizations logarithmic predict poles anomalous twist orders perturbative results. generalization reciprocity respecting logarithmic case. orders reciprocity respecting poles. reconstruction wrapping twist pages adde
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non_dup
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[] |
2192772
|
10.1007/JHEP08(2011)097
|
We study the problem of a Schwarzschild-anti-deSitter black hole in a
noncommutative geometry framework, thought to be an effective description of
quantum-gravitational spacetime. As a first step we derive the noncommutative
geometry inspired Schwarzschild-anti-deSitter solution. After studying the
horizon structure, we find that the curvature singularity is smeared out by the
noncommutative fluctuations. On the thermodynamics side, we show that the black
hole temperature, instead of a divergent behavior at small scales, admits a
maximum value. This fact implies an extension of the Hawking-Page transition
into a van der Waals-like phase diagram, with a critical point at a critical
cosmological constant size in Plank units and a smooth crossover thereafter. We
speculate that, in the gauge-string dictionary, this corresponds to the
confinement "critical point" in number of colors at finite number of flavors, a
highly non-trivial parameter that can be determined through lattice
simulations.Comment: 24 pages, 6 figure, 1 table, version matching that published on JHE
|
The Hawking-Page crossover in noncommutative anti-deSitter space
|
the hawking-page crossover in noncommutative anti-desitter space
|
schwarzschild desitter noncommutative thought gravitational spacetime. derive noncommutative inspired schwarzschild desitter solution. studying horizon curvature singularity smeared noncommutative fluctuations. thermodynamics divergent admits value. hawking waals cosmological plank crossover thereafter. speculate dictionary confinement colors flavors trivial pages matching
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non_dup
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[] |
2184908
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10.1007/JHEP08(2011)103
|
We present a new model for simulating exclusive final states in minimum-bias
collisions between hadrons. In a series of papers we have developed a Monte
Carlo model based on Mueller's dipole picture of BFKL-evolution, supplemented
with non-leading corrections, which has shown to be very successful in
describing inclusive and semi-inclusive observables in hadron collisions. In
this paper we present a further extension of this model to also describe
exclusive final states. This is a highly non-trivial extension, and we have
encountered many details that influence the description, and for which no
guidance from perturbative QCD could be found. Hence we have had to make many
choices based on semi-classical and phenomenological arguments. The end result
is a new event generator called DIPSY which can be used to simulate complete
minimum-bias non-diffractive hadronic collision events. Although the
description of data from the Tevatron and LHC is not quite as good as for
PYTHIA, the most advanced of the general purpose event generator programs for
these processes, our results are clearly competitive, and can be expected to
improve with careful tuning. In addition, as our model is very different from
conventional multiple scattering scenaria, the DIPSY program can be used to
gain deeper insight in the soft and semi-hard processes involved both in
hadronic and heavy ion collisions.Comment: 42 pages. v2: minor edit
|
Inclusive and Exclusive observables from dipoles in high energy
collisions
|
inclusive and exclusive observables from dipoles in high energy collisions
|
simulating exclusive collisions hadrons. papers monte carlo mueller dipole picture bfkl supplemented successful describing inclusive inclusive observables hadron collisions. exclusive states. trivial encountered guidance perturbative found. choices phenomenological arguments. generator dipsy simulate diffractive hadronic collision events. tevatron pythia advanced generator programs competitive careful tuning. scenaria dipsy deeper insight hadronic pages. minor edit
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non_dup
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[] |
84457290
|
10.1007/JHEP08(2011)105
|
In this paper we investigate the localisation of SUSY-breaking branes which, in the smeared approximation, support specific non-BPS vacua. We show, for a wide class of boundary conditions, that there is no flux vacuum when the branes are described by a genuine delta-function. Even more, we find that the smeared solution is the unique solution with a regular brane profile. Our setup consists of a non-BPS AdS(7) solution in massive IIA supergravity with smeared anti-D6-branes and fluxes T-dual to ISD fluxes in IIB supergravity.Swedish Research CouncilGöran Gustafsson FoundationDFG/Emmy Noether ProgramDFG/EXC/QUESTAlfred P. Sloan FoundationNSF/PHY-0757868NSF/PHY05-5116
|
The problematic backreaction of SUSY-breaking branes
|
the problematic backreaction of susy-breaking branes
|
localisation susy breaking branes smeared vacua. branes genuine delta function. smeared brane profile. setup massive supergravity smeared branes fluxes fluxes supergravity.swedish councilgöran gustafsson foundationdfg emmy noether programdfg questalfred sloan foundationnsf
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non_dup
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[] |
2185143
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10.1007/JHEP08(2011)106
|
We survey the phenomenological constraints on abelian gauge bosons having
masses in the MeV to multi-GeV mass range (using precision electroweak
measurements, neutrino-electron and neutrino-nucleon scattering, electron and
muon anomalous magnetic moments, upsilon decay, beam dump experiments, atomic
parity violation, low-energy neutron scattering and primordial
nucleosynthesis). We compute their implications for the three parameters that
in general describe the low-energy properties of such bosons: their mass and
their two possible types of dimensionless couplings (direct couplings to
ordinary fermions and kinetic mixing with Standard Model hypercharge). We argue
that gauge bosons with very small couplings to ordinary fermions in this mass
range are natural in string compactifications and are likely to be generic in
theories for which the gravity scale is systematically smaller than the Planck
mass - such as in extra-dimensional models - because of the necessity to
suppress proton decay. Furthermore, because its couplings are weak, in the
low-energy theory relevant to experiments at and below TeV scales the charge
gauged by the new boson can appear to be broken, both by classical effects and
by anomalies. In particular, if the new gauge charge appears to be anomalous,
anomaly cancellation does not also require the introduction of new light
fermions in the low-energy theory. Furthermore, the charge can appear to be
conserved in the low-energy theory, despite the corresponding gauge boson
having a mass. Our results reduce to those of other authors in the special
cases where there is no kinetic mixing or there is no direct coupling to
ordinary fermions, such as for recently proposed dark-matter scenarios.Comment: 49 pages + appendix, 21 figures. This is the final version which
appears in JHE
|
New Constraints (and Motivations) for Abelian Gauge Bosons in the
MeV-TeV Mass Range
|
new constraints (and motivations) for abelian gauge bosons in the mev-tev mass range
|
phenomenological abelian bosons precision electroweak nucleon muon anomalous moments upsilon dump parity violation neutron primordial nucleosynthesis bosons dimensionless couplings couplings ordinary fermions hypercharge argue bosons couplings ordinary fermions compactifications generic systematically planck extra necessity suppress proton decay. couplings gauged boson broken anomalies. anomalous anomaly cancellation fermions theory. conserved boson mass. ordinary fermions pages figures.
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non_dup
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[] |
2155628
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10.1007/JHEP08(2011)107
|
We consider the recursion relation for loop integrands in planar N = 4 SYM
generated by an all-line shift of momentum twistors. We examine the behaviour
of the rational loop integrands when the shift parameter becomes large, and
find that a valid recursion relation may be obtained in all cases. The
recursion relation is then formulated both in region momentum space and in
momentum twistor space, and solved in detail for some one and two-loop
examples. Finally, we show that the general iterative solution of the recursion
relation generates the MHV vertex expansion for all loop integrands, providing
a proof of the MHV diagram formalism for all loop amplitudes in planar N = 4
SYM.Comment: 37 page
|
MHV Diagrams from an All-Line Recursion Relation
|
mhv diagrams from an all-line recursion relation
|
recursion integrands planar twistors. examine rational integrands valid recursion cases. recursion formulated twistor solved examples. iterative recursion generates integrands formalism amplitudes planar
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non_dup
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[] |
2151122
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10.1007/JHEP08(2011)108
|
We suggest a novel approach to UV-completion of a class of non-renormalizable
theories, according to which the high-energy scattering amplitudes get
unitarized by production of extended classical objects (classicalons), playing
a role analogous to black holes, in the case of non-gravitational theories. The
key property of classicalization is the existence of a classicalizer field that
couples to energy-momentum sources. Such localized sources are excited in
high-energy scattering processes and lead to the formation of classicalons. Two
kinds of natural classicalizers are Nambu-Goldstone bosons (or, equivalently,
longitudinal polarizations of massive gauge fields) and scalars coupled to
energy-momentum type sources. Classicalization has interesting phenomenological
applications for the UV-completion of the Standard Model both with or without
the Higgs. In the Higgless Standard Model the high-energy scattering amplitudes
of longitudinal $W$-bosons self-unitarize via classicalization, without the
help of any new weakly-coupled physics. Alternatively, in the presence of a
Higgs boson, classicalization could explain the stabilization of the hierarchy.
In both scenarios the high-energy scatterings are dominated by the formation of
classicalons, which subsequently decay into many particle states. The
experimental signatures at the LHC are quite distinctive, with sharp
differences in the two cases.Comment: 37 page
|
UV-Completion by Classicalization
|
uv-completion by classicalization
|
completion renormalizable amplitudes unitarized classicalons playing analogous holes gravitational theories. classicalization classicalizer couples sources. localized excited classicalons. kinds classicalizers nambu goldstone bosons equivalently longitudinal polarizations massive scalars sources. classicalization phenomenological completion higgs. higgless amplitudes longitudinal bosons unitarize classicalization weakly physics. alternatively boson classicalization stabilization hierarchy. scenarios scatterings dominated classicalons subsequently states. signatures distinctive sharp
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non_dup
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[] |
157677561
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10.1007/JHEP08(2011)111
|
We study an M-theory solution for the holographic flow of AdS4 times Sasaki-Einstein 7-manifolds with skew-whiffing, perturbed by a mass operator. The infrared solution contains the 5 dimensional Schrodinger geometry after considering the gravity dual of the standard non-relativistic limit of relativistic field theories. The mass deformation of the field theory is discussed in detail for the case with 7 manifold being a round sphere.We study an M-theory solution for the holographic flow of AdS4 times Sasaki-Einstein 7-manifolds with skew-whiffing, perturbed by a mass operator. The infrared solution contains the 5 dimensional Schrodinger geometry after considering the gravity dual of the standard non-relativistic limit of relativistic field theories. The mass deformation of the field theory is discussed in detail for the case with 7 manifold being a round sphere.1
|
Emergent Schrodinger geometries from mass-deformed CFT
|
emergent schrodinger geometries from mass-deformed cft
|
holographic sasaki einstein manifolds skew whiffing perturbed operator. infrared schrodinger relativistic relativistic theories. deformation manifold round sphere.we holographic sasaki einstein manifolds skew whiffing perturbed operator. infrared schrodinger relativistic relativistic theories. deformation manifold round sphere.
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non_dup
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[] |
2189204
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10.1007/JHEP08(2011)113
|
We construct models of indirect gauge mediation where the dynamics
responsible for breaking supersymmetry simultaneously generates a weakly
coupled subsector of messengers. This provides a microscopic realization of
messenger gauge mediation where the messenger and hidden sector fields are
unified into a single sector. The UV theory is SQCD with massless and massive
quarks plus singlets, and at low energies it flows to a weakly coupled quiver
gauge theory. One node provides the primary source of supersymmetry breaking,
which is then transmitted to the node giving rise to the messenger fields.
These models break R-symmetry spontaneously, produce realistic gaugino and
sfermion masses, and give a heavy gravitino.Comment: 24 pages, 2 figures, accepted to JHEP for publicatio
|
A microscopic theory of gauge mediation
|
a microscopic theory of gauge mediation
|
indirect mediation breaking supersymmetry simultaneously generates weakly subsector messengers. microscopic realization messenger mediation messenger hidden unified sector. sqcd massless massive quarks singlets flows weakly quiver theory. supersymmetry breaking transmitted giving messenger fields. break spontaneously realistic gaugino sfermion pages jhep publicatio
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non_dup
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[] |
2189473
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10.1007/JHEP08(2011)115
|
When supersymmetry is broken in multiple sectors via independent dynamics,
the theory furnishes a corresponding multiplicity of "goldstini" degrees of
freedom which may play a substantial role in collider phenomenology and
cosmology. In this paper, we explore the tree-level mass spectrum of goldstini
arising from a general admixture of F-term, D-term, and almost no-scale
supersymmetry breaking, employing non-linear superfields and a novel gauge
fixing for supergravity discussed in a companion paper. In theories of F-term
and D-term breaking, goldstini acquire a mass which is precisely twice the
gravitino mass, while the inclusion of no-scale breaking renders one of these
modes, the modulino, massless. We argue that the vanishing modulino mass can be
explained in terms of an accidental and spontaneously broken "global"
supersymmetry.Comment: 10 pages, 2 figures; v2: typo corrected, references updated; v3:
version to appear in JHE
|
The Spectrum of Goldstini and Modulini
|
the spectrum of goldstini and modulini
|
supersymmetry broken sectors furnishes multiplicity goldstini freedom substantial collider phenomenology cosmology. explore goldstini arising admixture supersymmetry breaking employing superfields fixing supergravity companion paper. breaking goldstini acquire precisely twice gravitino inclusion breaking renders modulino massless. argue vanishing modulino accidental spontaneously broken pages typo corrected updated
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non_dup
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[] |
2193175
|
10.1007/JHEP08(2011)120
|
We consider breaking of supersymmetry in intersecting D-brane configurations
by slight deviation of the angles from their supersymmetric values. We compute
the masses generated by radiative corrections for the adjoint scalars on the
brane world-volumes. In the open string channel, the string two-point function
receives contributions only from the infrared and the ultraviolet limits. The
latter is due to tree-level closed string uncanceled NS-NS tadpoles, which we
explicitly reproduce from the effective Born-Infeld action. On the other hand,
the infrared region reproduces the one-loop mediation of supersymmetry breaking
in the effective gauge theory, via messengers and their Kaluza-Klein
excitations. In the toroidal set-up considered here, it receives contributions
only from broken N=4 and N=2 supersymmetric configurations, and thus always
leads at leading order to a tachyonic direction, in agreement with effective
field theory expectations.Comment: 40 page
|
One-loop adjoint masses for non-supersymmetric intersecting branes
|
one-loop adjoint masses for non-supersymmetric intersecting branes
|
breaking supersymmetry intersecting brane configurations slight angles supersymmetric values. radiative adjoint scalars brane volumes. receives infrared ultraviolet limits. uncanceled tadpoles explicitly reproduce born infeld action. infrared reproduces mediation supersymmetry breaking messengers kaluza klein excitations. toroidal receives broken supersymmetric configurations tachyonic
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non_dup
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[] |
2144602
|
10.1007/JHEP08(2011)123
|
In this publication, an algorithm is presented that combines the ME+PS
approach to merge sequences of tree-level matrix elements into inclusive event
samples with the POWHEG method, which combines exact next-to-leading order
matrix element results with the parton shower. It was developed in parallel to
the MENLOPS technique and has been implemented in the event generator Sherpa.
The benefits of this approach are exemplified by some first predictions for a
number of processes, namely the production of jets in e+ e- annihilation, in
deep-inelastic ep scattering, in association with single W, Z or Higgs bosons,
and with vector boson pairs at hadron colliders.Comment: 34 pages, 24 figures, v2 as accepted for publication in JHEP:
extended discussion of unitarity violation
|
NLO matrix elements and truncated showers
|
nlo matrix elements and truncated showers
|
publication combines merge inclusive powheg combines parton shower. menlops implemented generator sherpa. benefits exemplified jets annihilation inelastic bosons boson hadron pages publication jhep unitarity violation
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non_dup
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[] |
2133311
|
10.1007/JHEP08(2011)127
|
In this note we explore the application of modular invariance in
2-dimensional CFT to derive universal bounds for quantities describing certain
state degeneracies, such as the thermodynamic entropy, or the number of
marginal operators. We show that the entropy at inverse temperature 2 pi
satisfies a universal lower bound, and we enumerate the principal obstacles to
deriving upper bounds on entropies or quantum mechanical degeneracies for fully
general CFTs. We then restrict our attention to infrared stable CFT with
moderately low central charge, in addition to the usual assumptions of modular
invariance, unitarity and discrete operator spectrum. For CFT in the range
c_left + c_right < 48 with no relevant operators, we are able to prove an upper
bound on the thermodynamic entropy at inverse temperature 2 pi. Under the same
conditions we also prove that a CFT can have a number of marginal deformations
no greater than ((c_left + c_right) / (48 - c_left - c_right)) e^(4 Pi) - 2.Comment: 23 pages, LaTeX, minor change
|
Bounds for State Degeneracies in 2D Conformal Field Theory
|
bounds for state degeneracies in 2d conformal field theory
|
explore modular invariance derive universal bounds quantities describing degeneracies thermodynamic marginal operators. satisfies universal enumerate principal obstacles deriving bounds entropies degeneracies cfts. restrict infrared moderately usual assumptions modular invariance unitarity spectrum. thermodynamic marginal deformations pages latex minor
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non_dup
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[] |
2186335
|
10.1007/JHEP08(2011)135
|
We propose an equivalence of the partition functions of two different 3d
gauge theories. On one side of the correspondence we consider the partition
function of 3d SL(2,R) Chern-Simons theory on a 3-manifold, obtained as a
punctured Riemann surface times an interval. On the other side we have a
partition function of a 3d N=2 superconformal field theory on S^3, which is
realized as a duality domain wall in a 4d gauge theory on S^4. We sketch the
proof of this conjecture using connections with quantum Liouville theory and
quantum Teichmuller theory, and study in detail the example of the
once-punctured torus. Motivated by these results we advocate a direct
Chern-Simons interpretation of the ingredients of (a generalization of) the
Alday-Gaiotto-Tachikawa relation. We also comment on M5-brane realizations as
well as on possible generalizations of our proposals.Comment: 53+1 pages, 14 figures; v2: typos corrected, references adde
|
SL(2,R) Chern-Simons, Liouville, and Gauge Theory on Duality Walls
|
sl(2,r) chern-simons, liouville, and gauge theory on duality walls
|
propose equivalence partition theories. correspondence partition chern simons manifold punctured riemann interval. partition superconformal realized duality sketch conjecture connections liouville teichmuller punctured torus. motivated advocate chern simons ingredients generalization alday gaiotto tachikawa relation. comment brane realizations generalizations pages typos corrected adde
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2191656
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10.1007/JHEP08(2011)138
|
We show that a Hagedorn spectrum (i.e., spectrum where the number of hadrons
grows exponentially with the mass) emerges automatically in large $N_c$ QCD in
2+1 and 3+1 dimensions. The approach is based on the study of Euclidean space
correlation functions for composite operators constructed from quark and gluon
fields and exploits the fact that the short time behavior of the correlators is
known in QCD. The demonstration relies on one critical assumption: that
perturbation theory accurately describes the trace of the logarithm of a matrix
of point-to-point correlation functions in the regime where the perturbative
corrections to the asymptotically free value are small.Comment: 18 pages, 5 figure
|
The Hagedorn spectrum and large $N_c$ QCD in 2+1 and 3+1 dimensions
|
the hagedorn spectrum and large $n_c$ qcd in 2+1 and 3+1 dimensions
|
hagedorn i.e. hadrons grows exponentially emerges automatically dimensions. euclidean composite gluon exploits correlators qcd. demonstration relies perturbation accurately describes trace logarithm perturbative asymptotically pages
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non_dup
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[] |
11288324
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10.1007/JHEP08(2011)141
|
A measurement is presented of the charged hadron multiplicity in hadronic PbPb collisions, as a function of pseudorapidity and centrality, at a collision energy of 2.76 TeV per nucleon pair. The data sample is collected using the CMS detector and a minimum-bias trigger, with the CMS solenoid off. The number of charged hadrons is measured both by counting the number of reconstructed particle hits and by forming hit doublets of pairs of layers in the pixel detector. The two methods give consistent results. The charged hadron multiplicity density dN(ch)/d eta, evaluated at eta=0 for head-on collisions, is found to be 1612 +/- 55, where the uncertainty is dominated by systematic effects. Comparisons of these results to previous measurements and to various models are also presented
|
Dependence on pseudorapidity and on centrality of charged hadron production in PbPb collisions at p sNN = 2.76 TeV
|
dependence on pseudorapidity and on centrality of charged hadron production in pbpb collisions at p snn = 2.76 tev
|
hadron multiplicity hadronic pbpb collisions pseudorapidity centrality collision nucleon pair. trigger solenoid off. hadrons counting reconstructed hits forming doublets pixel detector. results. hadron multiplicity collisions dominated effects. comparisons
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non_dup
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[] |
36063429
|
10.1007/JHEP08(2011)141Open
|
A measurement is presented of the charged hadron multiplicity in hadronic PbPb collisions, as a function of pseudorapidity and centrality, at a collision energy of 2.76 TeV per nucleon pair. The data sample is collected using the CMS detector and a minimum-bias trigger, with the CMS solenoid off. The number of charged hadrons is measured both by counting the number of reconstructed particle hits and by forming hit doublets of pairs of layers in the pixel detector. The two methods give consistent results. The charged hadron multiplicity density, dN ch /dη| η=0, for head-on collisions is found to be 1612 ± 55, where the uncertainty is dominated by systematic effects. Comparisons of these results to previous measurements and to various models are also presented.Peer Reviewe
|
Dependence on pseudorapidity and on centrality of charged hadron production in PbPb collisions at root s(NN)=2.76 TeV
|
dependence on pseudorapidity and on centrality of charged hadron production in pbpb collisions at root s(nn)=2.76 tev
|
hadron multiplicity hadronic pbpb collisions pseudorapidity centrality collision nucleon pair. trigger solenoid off. hadrons counting reconstructed hits forming doublets pixel detector. results. hadron multiplicity collisions dominated effects. comparisons presented.peer reviewe
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non_dup
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[] |
2185640
|
10.1007/JHEP08(2011)146
|
We give a very simple derivation of the forms of $N=2,D=10$ supergravity from
supersymmetry and $SL(2,\bbR)$ (for IIB). Using superspace cohomology we show
that, if the Bianchi identities for the physical fields are satisfied, the
(consistent) Bianchi identities for all of the higher-rank forms must be
identically satisfied, and that there are no possible gauge-trivial Bianchi
identities ($dF=0$) except for exact eleven-forms. We also show that the
degrees of the forms can be extended beyond the spacetime limit, and that the
representations they fall into agree with those predicted from Borcherds
algebras. In IIA there are even-rank RR forms, including a non-zero
twelve-form, while in IIB there are non-trivial Bianchi identities for
thirteen-forms even though these forms are identically zero in supergravity. It
is speculated that these higher-rank forms could be non-zero when higher-order
string corrections are included.Comment: 15 pages. Published version. Some clarification of the tex
|
Maximal supergravity in D=10: forms, Borcherds algebras and superspace
cohomology
|
maximal supergravity in d=10: forms, borcherds algebras and superspace cohomology
|
derivation supergravity supersymmetry superspace cohomology bianchi identities satisfied bianchi identities identically satisfied trivial bianchi identities eleven forms. spacetime representations fall agree borcherds algebras. twelve trivial bianchi identities thirteen identically supergravity. speculated pages. version. clarification
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non_dup
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2158722
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10.1007/JHEP08(2011)148
|
We give details of our precise determination of the light quark masses
m_{ud}=(m_u+m_d)/2 and m_s in 2+1 flavor QCD, with simulated pion masses down
to 120 MeV, at five lattice spacings, and in large volumes. The details concern
the action and algorithm employed, the HMC force with HEX smeared clover
fermions, the choice of the scale setting procedure and of the input masses.
After an overview of the simulation parameters, extensive checks of algorithmic
stability, autocorrelation and (practical) ergodicity are reported. To
corroborate the good scaling properties of our action, explicit tests of the
scaling of hadron masses in N_f=3 QCD are carried out. Details of how we
control finite volume effects through dedicated finite volume scaling runs are
reported. To check consistency with SU(2) Chiral Perturbation Theory the
behavior of M_\pi^2/m_{ud} and F_\pi as a function of m_{ud} is investigated.
Details of how we use the RI/MOM procedure with a separate continuum limit of
the running of the scalar density R_S(\mu,\mu') are given. This procedure is
shown to reproduce the known value of r_0m_s in quenched QCD. Input from
dispersion theory is used to split our value of m_{ud} into separate values of
m_u and m_d. Finally, our procedure to quantify both systematic and statistical
uncertainties is discussed.Comment: 45 page
|
Lattice QCD at the physical point: Simulation and analysis details
|
lattice qcd at the physical point: simulation and analysis details
|
precise flavor pion spacings volumes. concern smeared clover fermions masses. overview extensive checks algorithmic autocorrelation practical ergodicity reported. corroborate hadron out. dedicated runs reported. check consistency chiral perturbation investigated. continuum running given. reproduce quenched qcd. split quantify
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non_dup
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[] |
2147308
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10.1007/JHEP08(2011)150
|
We derive the modified Friedmann equation corresponding to the power-law
corrected entropy-area relation $S_{\rm A}=\frac{A}{4}[1-K_{\alpha}
A^{1-\frac{\alpha}{2}}]$ which is motivated by the entanglement of quantum
fields in and out of the apparent horizon. We consider a non-flat modified FRW
universe containing an interacting viscous dark energy with dark matter and
radiation. For the selected model, we study the effect of the power-law
correction term to the entropy on the dynamics of dark energy. Furthermore, we
investigate the validity of the generalized second law (GSL) of gravitational
thermodynamics on the apparent horizon and conclude that the GSL is satisfied
for $\alpha<2$.Comment: 12 pages, Accepted for Publication in JHE
|
Thermodynamics of apparent horizon in modified FRW universe with
power-law corrected entropy
|
thermodynamics of apparent horizon in modified frw universe with power-law corrected entropy
|
derive friedmann corrected frac alpha frac alpha motivated entanglement apparent horizon. universe interacting viscous radiation. energy. validity gravitational thermodynamics apparent horizon satisfied alpha .comment pages publication
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non_dup
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2189482
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10.1007/JHEP08(2011)152
|
We study the deformation induced by fluxes and instanton effects on Yukawa
couplings involving 7-brane intersections in local F-theory constructions. In
the absence of non-perturbative effects, holomorphic Yukawa couplings do not
depend on open string fluxes. On the other hand instanton effects (or gaugino
condensation on distant 7-branes) do induce corrections to the Yukawas. The
leading order effect may also be captured by the presence of closed string
(1,2) IASD fluxes, which give rise to a non-commutative structure. We check
that even in the presence of these non-perturbative effects the holomorphic
Yukawas remain independent of magnetic fluxes. Although fermion mass
hierarchies may be obtained from these non-perturbative effects, they would
give identical Yukawa couplings for D-quark and Lepton masses in SU(5) F-theory
GUT's, in contradiction with experiment. We point out that this problem may be
solved by appropriately normalizing the wavefunctions. We show in a simple toy
model how the presence of hypercharge flux may then be responsible for the
difference between D-quarks and Lepton masses in local SU(5) GUT's.Comment: 84 pages, 1 figure. v2: minor corrections and references adde
|
Flux and Instanton Effects in Local F-theory Models and Hierarchical
Fermion Masses
|
flux and instanton effects in local f-theory models and hierarchical fermion masses
|
deformation fluxes instanton yukawa couplings involving brane intersections constructions. perturbative holomorphic yukawa couplings fluxes. instanton gaugino condensation distant branes induce yukawas. captured iasd fluxes commutative structure. check perturbative holomorphic yukawas fluxes. fermion hierarchies perturbative yukawa couplings lepton contradiction experiment. solved appropriately normalizing wavefunctions. hypercharge quarks lepton pages figure. minor adde
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non_dup
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[] |
5252881
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10.1007/JHEP08(2012)001
|
We revisit local F-theory SO(10) and SU(5) GUTs and analyze their properties
within the framework of the maximal underlying E_8 symmetry in the elliptic
fibration. We consider the symmetry enhancements along the intersections of
seven-branes with the GUT surface and study in detail the embedding of the
abelian factors undergoing monodromies in the covering gauge groups. We combine
flux data from the successive breaking of SO(10) to SU(5) gauge symmetry and
subsequently to the Standard Model one, and further constrain the parameters
determining the models' particle spectra. In order to eliminate dangerous
baryon number violating operators we propose ways to construct matter parity
like symmetries from intrinsic geometric origin. We study implementations of
the resulting constrained scenario in specific examples obtained for a variety
of monodromies.Comment: 53 page
|
Building SO(10) models from F-theory
|
building so(10) models from f-theory
|
revisit guts analyze maximal elliptic fibration. enhancements intersections seven branes embedding abelian undergoing monodromies covering groups. combine successive breaking subsequently constrain determining spectra. eliminate dangerous baryon violating propose ways parity symmetries intrinsic geometric origin. implementations constrained
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non_dup
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[] |
5242572
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10.1007/JHEP08(2012)002
|
We compute the phase diagram of the quark-meson model at finite temperature,
finite baryon chemical potential $\mu_B=3\mu$ and constant external magnetic
field $B$, using the functional renormalization group. Our results show that
the critical temperature increases as a function of $B$ at $\mu=0$, but for
values $\mu$ larger than about 210-225 MeV, the opposite behavior is realized.
As the magnetic field increases, the critical point $(T^*,\mu^*)$ moves from
large $\mu$, small $T$ towards small $\mu$, larger $T$ in the $\mu$--$T$ phase
diagram.Comment: 16 pages and 6 figures v3: typos fixed and layout of figs improved.
Matches published versio
|
The chiral transition in a magnetic background: Finite density effects
and the functional renormalization group
|
the chiral transition in a magnetic background: finite density effects and the functional renormalization group
|
meson baryon renormalization group. opposite realized. moves pages typos layout figs improved. matches versio
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non_dup
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[] |
5235241
|
10.1007/JHEP08(2012)005
|
In the context of the MSSM the Light Stop Scenario (LSS) is the only region
of parameter space that allows for successful Electroweak Baryogenesis (EWBG).
This possibility is very phenomenologically attractive, since it allows for the
direct production of light stops and could be tested at the LHC. The ATLAS and
CMS experiments have recently supplied tantalizing hints for a Higgs boson with
a mass of ~ 125 GeV. This Higgs mass severely restricts the parameter space of
the LSS, and we discuss the specific predictions made for EWBG in the MSSM.
Combining data from all the available ATLAS and CMS Higgs searches reveals a
tension with the predictions of EWBG even at this early stage. This allows us
to exclude EWBG in the MSSM at greater than (90) 95% confidence level in the
(non-)decoupling limit, by examining correlations between different Higgs decay
channels. We also examine the exclusion without the assumption of a ~ 125 GeV
Higgs. The Higgs searches are still highly constraining, excluding the entire
EWBG parameter space at greater than 90% CL except for a small window of m_h ~
117 - 119 GeV.Comment: 24 Pages, 4 Figures (v3: fixed typos, minor corrections, added
references
|
Excluding Electroweak Baryogenesis in the MSSM
|
excluding electroweak baryogenesis in the mssm
|
mssm stop successful electroweak baryogenesis ewbg phenomenologically attractive stops lhc. atlas supplied tantalizing hints boson gev. severely restricts ewbg mssm. combining atlas searches reveals tension ewbg stage. exclude ewbg mssm confidence decoupling examining channels. examine exclusion higgs. searches constraining excluding ewbg window pages typos minor
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non_dup
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[] |
5255193
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10.1007/JHEP08(2012)007
|
Some admissible gauge groups of N=4 Chern-Simons gauged supergravity in three
dimensions with exceptional scalar manifolds $G_{2(2)}/SO(4)$,
$F_{4(4)}/USp(6)\times SU(2)$, $E_{6(2)}/SU(6)\times SU(2)$,
$E_{7(-5)}/SO(12)\times SU(2)$ and $E_{8(-24)}/E_7\times SU(2)$ are identified.
In particular, a complete list of all possible gauge groups is given for the
theory with $G_{2(2)}/SO(4)$ coset space. We also study scalar potentials for
all of these gauge groups and find some critical points. In the case of
$F_{4(4)}/USp(6)\times SU(2)$ target space, we give some semisimple gauge
groups which are maximal subgroups of $F_{4(4)}$. Most importantly, we
construct the $SO(4)\ltimes \mathbf{T}^6$ gauged supergravity which is
equivalent to N=4 SO(4) Yang-Mills gauged supergravity. The latter is proposed
to be obtained from an $S^3$ reduction of $(1,0)$ six dimensional supergravity
coupled to two vector and two tensor multiplets. The scalar potential of this
theory on the scalar fields which are invariant under SO(4) is explicitly
computed. Depending on the value of the coupling constants, the theory admits
both dS and AdS vacua when all of the 28 scalars vanish. The maximal N=4
supersymmetric $AdS_3$ should correspond to the $AdS_3\times S^3$ solution of
the $(1,0)$ six dimensional theory. Finally, some gauge groups of the theories
with $E_{6(2)}/SU(6)\times SU(2)$, $E_{7(-5)}/SO(12)\times SU(2)$ and
$E_{8(-24)}/E_7\times SU(2)$ scalar manifolds are identified.Comment: 27 pages, no figures, typoes correcte
|
Gaugings of N=4 three dimensional gauged supergravity with exceptional
coset manifolds
|
gaugings of n=4 three dimensional gauged supergravity with exceptional coset manifolds
|
admissible chern simons gauged supergravity exceptional manifolds identified. coset space. potentials points. semisimple maximal subgroups importantly ltimes mathbf gauged supergravity mills gauged supergravity. supergravity multiplets. explicitly computed. admits vacua scalars vanish. maximal supersymmetric theory. manifolds pages typoes correcte
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non_dup
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[] |
5258940
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10.1007/JHEP08(2012)009
|
We consider the chiral condensate in the baryonic dense medium using the
generalized Sakai-Sugimoto model. It is defined as the vacuum expectation value
of open Wilson line that is proposed to be calculated by use of the area of
world-sheet instanton. We evaluate it in confined as well as deconfined phase.
In both phases, the chiral condensate has a minimum as a function of baryon
density. In the deconfined phase, taking into account the chiral symmetry
restoration, we classify the behavior of chiral condensate into three types.
One can set the parameter of the theory such that the results, in low but
sufficiently higher density, is in agreement with the expectation from QCD.Comment: 23 pages, 8 figure
|
Chiral Condensate in Holographic QCD with Baryon Density
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chiral condensate in holographic qcd with baryon density
|
chiral condensate baryonic dense sakai sugimoto model. expectation wilson sheet instanton. confined deconfined phase. chiral condensate baryon density. deconfined chiral restoration classify chiral condensate types. sufficiently expectation pages
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non_dup
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5256600
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10.1007/JHEP08(2012)010
|
The staged increase of the LHC beam energy provides a new class of
interesting observables, namely ratios and double ratios of cross sections of
various hard processes. The large degree of correlation of theoretical
systematics in the cross section calculations at different energies leads to
highly precise predictions for such ratios. We present in this letter few
examples of such ratios, and discuss their possible implications, both in terms
of opportunities for precision measurements and in terms of sensitivity to
Beyond the Standard Model dynamics.Comment: 19 pages, 9 figure
|
Cross Section Ratios between different CM energies at the LHC:
opportunities for precision measurements and BSM sensitivity
|
cross section ratios between different cm energies at the lhc: opportunities for precision measurements and bsm sensitivity
|
staged observables processes. systematics precise ratios. letter opportunities precision pages
|
non_dup
|
[] |
5253511
|
10.1007/JHEP08(2012)011
|
Maldacena has shown that the wavefunction of the universe in de Sitter space
can be viewed as the partition function of a conformal field theory. In this
paper, we investigate this approach to the dS/CFT correspondence in further
detail. We emphasize that massive bulk fields are dual to two primary operators
on the boundary, which encode information about the two independent behaviors
of bulk expectation values at late times. An operator statement of the duality
is given, and it is shown that the resulting boundary correlators can be
interpreted as transition amplitudes from the Bunch-Davies vacuum to an excited
state in the infinite future. We also explain how these scattering amplitudes
can be used to compute late-time Bunch-Davies expectation values, and comment
on the effects of anomalies in the dual CFT on such expectation values.Comment: 15 pages, as published in JHEP, with clarifications and references
adde
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Transition Amplitudes in de Sitter Space
|
transition amplitudes in de sitter space
|
maldacena wavefunction universe sitter viewed partition conformal theory. correspondence detail. emphasize massive encode behaviors expectation times. statement duality correlators interpreted amplitudes bunch davies excited infinite future. amplitudes bunch davies expectation comment anomalies expectation pages jhep clarifications adde
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non_dup
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144255939
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10.1007/JHEP08(2012)013
|
We construct a general class of pseudo-Goldstone composite Higgs models, within the minimal SO(5)/SO(4) coset structure, that are not necessarily of moose-type. We characterize the main properties these models should have in order to give rise to a Higgs mass around 125 GeV. We assume the existence of relatively light and weakly coupled spin 1 and 1/2 resonances. In absence of a symmetry principle, we introduce the Minimal Higgs Potential (MHP) hypothesis: the Higgs potential is assumed to be one-loop dominated by the SM fields and the above resonances, with a contribution that is made calculable by imposing suitable generalizations of the first and second Weinberg sum rules. We show that a 125 GeV Higgs requires light, often sub-TeV, fermion resonances. Their presence can also be important for the models to successfully pass the electroweak precision tests. Interestingly enough, the latter can also be passed by models with a heavy Higgs around 320 GeV. The composite Higgs models of the moose-type considered in the literature can be seen as particular limits of our class of models
|
General composite Higgs models
|
general composite higgs models
|
pseudo goldstone composite coset necessarily moose type. characterize gev. weakly resonances. dominated resonances calculable imposing generalizations weinberg rules. fermion resonances. successfully pass electroweak precision tests. interestingly passed gev. composite moose
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non_dup
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[] |
5236871
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10.1007/JHEP08(2012)015
|
A formalism is presented for computing the higher-order corrections to the
worldvolume action of co-dimension one solitons. By modifying its potential, an
explicit "kink" solution of a real scalar field in AdS spacetime is found. The
formalism is then applied to explicitly compute the kink worldvolume action to
quadratic order in two expansion parameters--associated with the hypersurface
fluctuation length and the radius of AdS spacetime respectively. Two
alternative methods are given for doing this. The results are expressed in
terms of the trace of the extrinsic curvature and the intrinsic scalar
curvature. In addition to conformal Galileon interactions, we find a
non-Galileon term which is never sub-dominant. This method can be extended to
any conformally flat bulk spacetime.Comment: 32 pages, 3 figures, typos corrected and additional comments adde
|
The Worldvolume Action of Kink Solitons in AdS Spacetime
|
the worldvolume action of kink solitons in ads spacetime
|
formalism worldvolume solitons. modifying kink spacetime found. formalism explicitly kink worldvolume quadratic hypersurface fluctuation spacetime respectively. this. trace extrinsic curvature intrinsic curvature. conformal galileon galileon never dominant. conformally pages typos corrected comments adde
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non_dup
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[] |
5239607
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10.1007/JHEP08(2012)018
|
We study the basic features of BPS quiver mutations in 4D $\mathcal{N}=2$
supersymmetric quantum field theory with $G=ADE$ gauge symmetries.\ We show,
for these gauge symmetries, that there is an isotropy group
$\mathcal{G}_{Mut}^{G}$ associated to a set of quiver mutations capturing
information about the BPS spectra. In the strong coupling limit, it is shown
that BPS chambers correspond to finite and closed groupoid orbits with an
isotropy symmetry group $\mathcal{G}_{strong}^{G}$ isomorphic to the discrete
dihedral groups $Dih_{2h_{G}}$ contained in Coxeter$(G) $ with $% h_{G}$ the
Coxeter number of G. These isotropy symmetries allow to determine the BPS
spectrum of the strong coupling chamber; and give another way to count the
total number of BPS and anti-BPS states of $\mathcal{N}=2$ gauge theories. We
also build the matrix realization of these mutation groups $%
\mathcal{G}_{strong}^{G}$ from which we read directly the electric-magnetic
charges of the BPS and anti-BPS states of $\mathcal{N}=2$ QFT$_{4}$ as well as
their matrix intersections. We study as well the quiver mutation symmetries in
the weak coupling limit and give their links with infinite Coxeter groups. We
show amongst others that $\mathcal{G}_{weak}^{su_{2}}$ is contained in
${GL}({2,}\mathbb{Z}) $; and isomorphic to the infinite Coxeter
${I_{2}^{\infty}}$. Other issues such as building
$\mathcal{G}%_{weak}^{so_{4}}$ and $\mathcal{G}_{weak}^{su_{3}}$ are also
studied.Comment: LaTeX, 98 pages, 18 figures, Appendix I on groupoids adde
|
Mutation Symmetries in BPS Quiver Theories: Building the BPS Spectra
|
mutation symmetries in bps quiver theories: building the bps spectra
|
quiver mathcal supersymmetric symmetries. symmetries isotropy mathcal quiver capturing spectra. chambers groupoid orbits isotropy mathcal isomorphic dihedral coxeter coxeter isotropy symmetries chamber count mathcal theories. build realization mutation mathcal read charges mathcal intersections. quiver mutation symmetries links infinite coxeter groups. amongst mathcal mathbb isomorphic infinite coxeter infty mathcal mathcal latex pages groupoids adde
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non_dup
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[] |
18297838
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10.1007/JHEP08(2012)019
|
Published on open access by SpringerThe Faddeev-Reshetikhin procedure corresponds to a removal of the non-ultralocality of the classical SU(2) principal chiral model. It is realized by defining another field theory, which has the same Lax pair and equations of motion but a different Poisson structure and Hamiltonian. Following earlier work of M. Semenov-Tian-Shansky and A. Sevostyanov, we show how it is possible to alleviate in a similar way the non-ultralocality of symmetric space ??-models. The equivalence of the equations of motion holds only at the level of the Pohlmeyer reduction of these models, which corresponds to symmetric space sine-Gordon models. This work therefore shows indirectly that symmetric space sine-Gordon models, defined by a gauged Wess-Zumino-Witten action with an integrable potential, have a mild non-ultralocality. The first step needed to construct an integrable discretization of these models is performed by determining the discrete analogue of the Poisson algebra of their Lax matrices
|
Alleviating the non-ultralocality of coset ??-models through a generalized Faddeev-Reshetikhin procedure
|
alleviating the non-ultralocality of coset ??-models through a generalized faddeev-reshetikhin procedure
|
springerthe faddeev reshetikhin removal ultralocality principal chiral model. realized defining poisson hamiltonian. semenov tian shansky sevostyanov alleviate ultralocality models. equivalence pohlmeyer sine gordon models. indirectly sine gordon gauged wess zumino witten integrable mild ultralocality. integrable discretization determining analogue poisson
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non_dup
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[] |
2255241
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10.1007/JHEP08(2012)022
|
Hybrid-NLIE equations, an alternative finite NLIE description for the
spectral problem of the super sigma model of AdS/CFT and its gamma-deformations
are derived by replacing the semi-infinite SU(2) and SU(4) parts of the AdS/CFT
TBA equations by a few appropriately chosen complex NLIE variables, which are
coupled among themselves and to the Y-functions associated to the remaining
central nodes of the TBA diagram. The integral equations are written explicitly
for the ground state of the gamma-deformed system. We linearize these NLIE
equations, analytically calculate the first correction to the asymptotic
solution and find agreement with analogous results coming from the original TBA
formalism. Our equations differ substantially from the recently published
finite FiNLIE formulation of the spectral problem.Comment: 63 pages, 1 figur
|
Hybrid-NLIE for the AdS/CFT spectral problem
|
hybrid-nlie for the ads/cft spectral problem
|
hybrid nlie nlie super sigma gamma deformations replacing infinite appropriately nlie diagram. explicitly gamma deformed system. linearize nlie analytically asymptotic analogous coming formalism. substantially finlie formulation pages figur
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non_dup
|
[] |
8781089
|
10.1007/JHEP08(2012)025
|
We perform an integral reduction for the 3-loop effective gauge coupling and
screening mass of QCD at high temperatures, defined as matching coefficients
appearing in the dimensionally reduced effective field theory (EQCD).
Expressing both parameters in terms of a set master (sum-) integrals, we show
explicit gauge parameter independence. The lack of suitable methods for solving
the comparatively large number of master integrals forbids the complete
evaluation at the moment. Taking one generic class of masters as an example, we
highlight the calculational techniques involved. The full result would allow to
improve on one of the classic probes for the convergence of the weak-coupling
expansion at high temperatures, namely the comparison of full and effective
theory determinations of the spatial string tension. Furthermore, the full
result would also allow to determine one new contribution of order O(g**7) to
the pressure of hot QCD.Comment: 19 pages, 2 figures. v2: new Section 6 discussing applications, to
match journal versio
|
Three-loop matching coefficients for hot QCD: Reduction and gauge
independence
|
three-loop matching coefficients for hot qcd: reduction and gauge independence
|
screening matching appearing dimensionally eqcd expressing master integrals independence. solving comparatively master integrals forbids moment. generic masters highlight calculational involved. classic probes determinations tension. pages figures. discussing match versio
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non_dup
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[] |
5237163
|
10.1007/JHEP08(2012)029
|
It is argued that experimental constraints on theories of asymmetric dark
matter (ADM) almost certainly require that the DM be part of a richer hidden
sector of interacting states of comparable mass or lighter. A general requisite
of models of ADM is that the vast majority of the symmetric component of the DM
number density must be removed in order to explain the observed relationship
$\Omega_B\sim\Omega_{DM}$ via the DM asymmetry. Demanding the efficient
annihilation of the symmetric component leads to a tension with experimental
limits if the annihilation is directly to Standard Model (SM) degrees of
freedom. A comprehensive effective operator analysis of the model independent
constraints on ADM from direct detection experiments and LHC monojet searches
is presented. Notably, the limits obtained essentially exclude models of ADM
with mass 1GeV$\lesssim m_{DM} \lesssim$ 100GeV annihilating to SM quarks via
heavy mediator states. This motivates the study of portal interactions between
the dark and SM sectors mediated by light states. Resonances and threshold
effects involving the new light states are shown to be important for
determining the exclusion limits.Comment: 18+6 pages, 18 figures. v2: version accepted for publicatio
|
Closing in on Asymmetric Dark Matter I: Model independent limits for
interactions with quarks
|
closing in on asymmetric dark matter i: model independent limits for interactions with quarks
|
argued asymmetric certainly richer hidden interacting comparable lighter. requisite vast majority removed omega omega asymmetry. demanding annihilation tension annihilation freedom. comprehensive monojet searches presented. notably essentially exclude lesssim lesssim annihilating quarks mediator states. motivates portal sectors states. resonances involving determining exclusion pages figures. publicatio
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non_dup
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5255945
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10.1007/JHEP08(2012)035
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We consider theories with time-dependent Hamiltonians which alternate between
being bounded and unbounded from below. For appropriate frequencies dynamical
stabilization can occur rendering the effective potential of the system stable.
We first study a free field theory on a torus with a time-dependent mass term,
finding that the stability regions are described in terms of the phase diagram
of the Mathieu equation. Using number theory we have found a compactification
scheme such as to avoid resonances for all momentum modes in the theory. We
further consider the gravity dual of a conformal field theory on a sphere in
three spacetime dimensions, deformed by a doubletrace operator. The gravity
dual of the theory with a constant unbounded potential develops big crunch
singularities; we study when such singularities can be cured by dynamical
stabilization. We numerically solve the Einstein-scalar equations of motion in
the case of a time-dependent doubletrace deformation and find that for
sufficiently high frequencies the theory is dynamically stabilized and big
crunches get screened by black hole horizons.Comment: LaTeX, 38 pages, 13 figures. V2: appendix C added, references added
and typos correcte
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Time-dependent stabilization in AdS/CFT
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time-dependent stabilization in ads/cft
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hamiltonians alternate unbounded below. stabilization rendering stable. torus mathieu equation. compactification avoid resonances theory. conformal sphere spacetime deformed doubletrace operator. unbounded develops crunch singularities singularities cured stabilization. numerically solve einstein doubletrace deformation sufficiently dynamically stabilized crunches screened latex pages figures. typos correcte
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non_dup
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5251779
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10.1007/JHEP08(2012)036
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Einstein-Strauss Hermitian gravity was recently formulated as a gauge theory
where the tangent group is taken to be the pseudo-unitary group instead of the
orthogonal group. A Higgs mechanism for massive gravity was also formulated. We
generalize this construction to obtain massive Hermitian gravity with the use
of a complex Higgs multiplet. We show that both the graviton and antisymmetric
tensor acquire the same mass. At the linearized level, the theory is ghost free
around Minkowski background and describes a massive graviton with five degrees
of freedom and an antisymmetric field with three degrees of of freedom. We
determine the strong coupling scales for these degrees of freedom and argue
that the potential nonlinear ghosts, if they exist, have to decouple from the
gravitational degrees of freedom in strong coupling regime.Comment: 10 page
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Massive Hermitian Gravity
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massive hermitian gravity
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einstein strauss hermitian formulated tangent pseudo unitary orthogonal group. massive formulated. generalize massive hermitian multiplet. graviton antisymmetric acquire mass. linearized ghost minkowski describes massive graviton freedom antisymmetric freedom. freedom argue ghosts decouple gravitational freedom
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non_dup
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5232870
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10.1007/JHEP08(2012)041
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The jet quenching parameter of an anisotropic plasma depends on the relative
orientation between the anisotropic direction, the direction of motion of the
parton, and the direction along which the momentum broadening is measured. We
calculate the jet quenching parameter of an anisotropic, strongly coupled N=4
plasma by means of its gravity dual. We present the results for arbitrary
orientations and arbitrary values of the anisotropy. The anisotropic value can
be larger or smaller than the isotropic one, and this depends on whether the
comparison is made at equal temperatures or at equal entropy densities. We
compare our results to analogous calculations for the real-world quark-gluon
plasma and find agreement in some cases and disagreement in others.Comment: 22 pages, 10 figures; v2: minor changes, added reference. Extends
arXiv:1202.369
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Jet quenching in a strongly coupled anisotropic plasma
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jet quenching in a strongly coupled anisotropic plasma
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quenching anisotropic anisotropic parton broadening measured. quenching anisotropic dual. orientations anisotropy. anisotropic isotropic densities. analogous gluon disagreement pages minor reference. extends
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non_dup
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[] |
5232763
|
10.1007/JHEP08(2012)043
|
We show how the Hopf algebra structure of multiple polylogarithms can be used
to simplify complicated expressions for multi-loop amplitudes in perturbative
quantum field theory and we argue that, unlike the recently popularized
symbol-based approach, the coproduct incorporates information about the zeta
values. We illustrate our approach by rewriting the two-loop helicity
amplitudes for a Higgs boson plus three gluons in a simplified and compact form
involving only classical polylogarithms.Comment: 46 page
|
Hopf algebras, coproducts and symbols: an application to Higgs boson
amplitudes
|
hopf algebras, coproducts and symbols: an application to higgs boson amplitudes
|
hopf polylogarithms simplify complicated expressions amplitudes perturbative argue unlike popularized symbol coproduct incorporates zeta values. illustrate rewriting helicity amplitudes boson gluons simplified involving
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non_dup
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[] |
5255582
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10.1007/JHEP08(2012)044
|
We study rigidly rotating strings in the near horizon geometry of the 1+1
dimensional intersection of two orthogonal stacks of NS5-branes, the so called
I-brane background. We solve the equations of motion of the fundamental string
action in the presence of two form NS-NS fluxes that the I-brane background
supports and write down general form of conserved quantities. We further find
out two limiting cases corresponding to giant magnon and single spike like
strings in various parameter space of solutions.Comment: 17 pages, major restructuring of text, added a referenc
|
Spiky Strings on I-brane
|
spiky strings on i-brane
|
rigidly rotating strings horizon intersection orthogonal stacks branes brane background. solve fluxes brane supports conserved quantities. limiting giant magnon spike strings pages restructuring referenc
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non_dup
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[] |
5253097
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10.1007/JHEP08(2012)047
|
We consider N=2 Kazama-Suzuki model on CP^N=SU(N+1)/SU(N)xU(1). It is known
that the N=2 current algebra for the supersymmetric WZW model, at level k, is a
nonlinear algebra. The N=2 W_3 algebra corresponding to N=2 was recovered from
the generalized GKO coset construction previously. For N=4, we construct one of
the higher spin currents, in N=2 W_5 algebra, with spins (2, 5/2, 5/2, 3). The
self-coupling constant in the operator product expansion of this current and
itself depends on N as well as k explicitly. We also observe a new higher spin
primary current of spins (3, 7/2, 7/2, 4). From the behaviors of N=2, 4 cases,
we expect the operator product expansion of the lowest higher spin current and
itself in N=2 W_{N+1} algebra. By taking the large (N, k) limit on the various
operator product expansions in components, we reproduce, at the linear order,
the corresponding operator product expansions in N=2 classical
W_{\infty}^{cl}[\lambda] algebra which is the asymptotic symmetry of the higher
spin AdS_3 supergravity found recently.Comment: 44 pages; the two typos in the first paragraph of page 23 corrected
and to appear in JHE
|
The Large N 't Hooft Limit of Kazama-Suzuki Model
|
the large n 't hooft limit of kazama-suzuki model
|
kazama suzuki supersymmetric algebra. recovered coset previously. currents spins explicitly. spins behaviors algebra. expansions reproduce expansions infty lambda asymptotic supergravity pages typos paragraph corrected
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non_dup
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[] |
5238955
|
10.1007/JHEP08(2012)048
|
Models of secluded dark matter offer a variant on the standard WIMP picture
and can modify our expectations for hidden sector phenomenology and detection.
In this work we extend a minimal model of secluded dark matter, comprised of a
U(1)'-charged dark matter candidate, to include a confining hidden-sector CFT.
This provides a technically natural explanation for the hierarchically small
mediator-scale, with hidden-sector confinement generating m_{gamma'}>0.
Furthermore, the thermal history of the universe can differ markedly from the
WIMP picture due to (i) new annihilation channels, (ii) a (potentially) large
number of hidden-sector degrees of freedom, and (iii) a hidden-sector phase
transition at temperatures T << M_{dm} after freeze out. The mediator allows
both the dark matter and the Standard Model to communicate with the CFT, thus
modifying the low-energy phenomenology and cosmic-ray signals from the secluded
sector.Comment: ~50p, 8 figs; v2 JHEP versio
|
Secluded Dark Matter Coupled to a Hidden CFT
|
secluded dark matter coupled to a hidden cft
|
secluded offer variant wimp picture modify expectations hidden phenomenology detection. extend secluded comprised candidate confining hidden cft. technically explanation hierarchically mediator hidden confinement generating gamma universe markedly wimp picture annihilation potentially hidden freedom hidden freeze out. mediator communicate modifying phenomenology cosmic secluded figs jhep versio
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non_dup
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[] |
6206647
|
10.1007/JHEP08(2012)049
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We exploit gauge/gravity duality to study `thermal quenches' in a plasma of
the strongly coupled N=2* gauge theory. Specifically, we consider the response
of an initial thermal equilibrium state of the theory under variations of the
bosonic or fermionic mass, to leading order in m/T<<1. When the masses are made
to vary in time, novel new counterterms must be introduced to renormalize the
boundary theory. We consider transitions the conformal super-Yang-Mills theory
to the mass deformed gauge theory and also the reverse transitions. By
construction, these transitions are controlled by a characteristic time scale
\calt and we show how the response of the system depends on the ratio of this
time scale to the thermal time scale 1/T. The response shows interesting
scaling behaviour both in the limit of fast quenches with T\calt<<1 and slow
quenches with T\calt>>1. In the limit that T\calt\to\infty, we observe the
expected adiabatic response. For fast quenches, the relaxation to the final
equilibrium is controlled by the lowest quasinormal mode of the bulk scalar
dual to the quenched operator. For slow quenches, the system relaxes with a
(nearly) adiabatic response that is governed entirely by the late time profile
of the mass. We describe new renormalization scheme ambiguities in defining
gauge invariant observables for the theory with time dependant couplings.Comment: 78 pages, 17 figure
|
Thermal quenches in N=2* plasmas
|
thermal quenches in n=2* plasmas
|
exploit duality quenches theory. bosonic fermionic vary counterterms renormalize theory. conformal super mills deformed reverse transitions. calt quenches calt slow quenches calt calt infty adiabatic response. quenches relaxation quasinormal quenched operator. slow quenches relaxes nearly adiabatic governed entirely mass. renormalization ambiguities defining observables dependant pages
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non_dup
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[] |
5249975
|
10.1007/JHEP08(2012)052
|
We investigate the Monte Carlo approach to propagation of experimental
uncertainties within the context of the established "MSTW 2008" global analysis
of parton distribution functions (PDFs) of the proton at next-to-leading order
in the strong coupling. We show that the Monte Carlo approach using replicas of
the original data gives PDF uncertainties in good agreement with the usual
Hessian approach using the standard Delta(chi^2) = 1 criterion, then we explore
potential parameterisation bias by increasing the number of free parameters,
concluding that any parameterisation bias is likely to be small, with the
exception of the valence-quark distributions at low momentum fractions x. We
motivate the need for a larger tolerance, Delta(chi^2) > 1, by making fits to
restricted data sets and idealised consistent or inconsistent pseudodata.
Instead of using data replicas, we alternatively produce PDF sets randomly
distributed according to the covariance matrix of fit parameters including
appropriate tolerance values, then we demonstrate a simpler method to produce
an arbitrary number of random predictions on-the-fly from the existing
eigenvector PDF sets. Finally, as a simple example application, we use Bayesian
reweighting to study the effect of recent LHC data on the lepton charge
asymmetry from W boson decays.Comment: 37 pages, 17 figures. v2: version published in JHEP. Supplementary
material at http://mstwpdf.hepforge.org/random
|
Study of Monte Carlo approach to experimental uncertainty propagation
with MSTW 2008 PDFs
|
study of monte carlo approach to experimental uncertainty propagation with mstw 2008 pdfs
|
monte carlo propagation mstw parton pdfs proton coupling. monte carlo replicas usual hessian delta criterion explore parameterisation concluding parameterisation exception valence fractions motivate tolerance delta fits restricted idealised inconsistent pseudodata. replicas alternatively randomly covariance tolerance simpler eigenvector sets. bayesian reweighting lepton asymmetry boson pages figures. jhep. supplementary
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non_dup
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