Journal of High Energy Physics

http://link.springer.com/journal/13130

List of Papers (Total 10,649)

The bulk channel in thermal gauge theories

We investigate the thermal correlator of the trace of the energy-momentum tensor in the SU(3) Yang-Mills theory. Our goal is to constrain the spectral function in that channel, whose low-frequency part determines the bulk viscosity. We focus on the thermal modification of the spectral function, ρ(ω, T)−ρ(ω, 0). Using the operator-product expansion we give the high-frequency...

Entanglement entropy in non-relativistic field theories

We calculate entanglement entropy in a non-relativistic field theory described by the Schrödinger operator. We demonstrate that the entropy is characterized by i) the area law and ii) UV divergences that are identical to those in the relativistic field theory. These observations are further supported by a holographic consideration. We use the non-relativistic symmetry and...

Minisuperspace limit of the AdS 3 WZNW model

We derive the three-point function of the AdS 3 WZNW model in the minisuperspace limit by Wick rotation from the H 3 + model. The result is expressed in terms of Clebsch-Gordan coefficients of the Lie algebra \( s\ell \left( {2,\mathbb{R}} \right) \). We also introduce a covariant basis of functions on AdS 3, which can be interpreted as bulk-boundary propagators.

Upper Higgs boson mass bounds from a chirally invariant lattice Higgs-Yukawa model

We establish the cutoff-dependent upper Higgs boson mass bound by means of direct lattice computations in the framework of a chirally invariant lattice Higgs-Yukawa model emulating the same chiral Yukawa coupling structure as in the Higgs-fermion sector of the Standard Model. As expected from the triviality picture of the Higgs sector, we observe the upper mass bound to decrease...

A general class of holographic superconductors

We introduce a simple generalization of the basic holographic superconductor model in which the spontaneous breaking of a global U(1) symmetry occurs via the Stückelberg mechanism. This more general setting allows tuning features such as the order of the transition. The physical vacuum of the condensed phase and the order of the transition are determined by a detailed analysis of...

One-loop superconformal and Yangian symmetries of scattering amplitudes in \( \mathcal{N} = 4 \) super Yang-Mills

Recently it has been argued that tree-level scattering amplitudes in \( \mathcal{N} = 4 \) Yang-Mills theory are uniquely determined by a careful study of their superconformal and Yangian symmetries. However, at one-loop order these symmetries are known to become anomalous due to infrared divergences. We compute these one-loop anomalies for amplitudes defined through dimensional...

Semileptonic decays of the standard Higgs boson

The Higgs boson decay into a pair of real or virtual W bosons, with one of them decaying leptonically, is predicted within the Standard Model to have the largest branching fraction of all Higgs decays that involve an isolated electron or muon, for M h > 120 GeV. We compute analytically the fully-differential width for this h 0→ℓνjj decay at tree level, and then explore some multi...

Dark matter particle spectroscopy at the LHC: generalizing M T2 to asymmetric event topologies

We consider SUSY-like missing energy events at hadron colliders and critically examine the common assumption that the missing energy is the result of two identical missing particles. In order to experimentally test this hypothesis, we generalize the subsystem M T2 variable to the case of asymmetric event topologies, where the two SUSY decay chains terminate in different “children...

New families of interpolating type IIB backgrounds

We construct new families of interpolating two-parameter solutions of type IIB supergravity. These correspond to D3-D5 systems on non-compact six-dimensional manifolds which are \(\mathbb{T}^{2} \) fibrations over Eguchi-Hanson and multi-center Taub-NUT spaces, respectively. One end of the interpolation corresponds to a solution with only D5 branes and vanishing NS three-form...

Energy-independent new physics in the flavour ratios of high-energy astrophysical neutrinos

We have studied the consequences of breaking the CPT symmetry in the neutrino sector, using the expected high-energy neutrino flux from distant cosmological sources such as active galaxies. For this purpose we have assumed three different hypotheses for the neutrino production model, characterised by the flavour fluxes at production ϕ0 e : ϕ0 μ: ϕ0 τ = 1 : 2 : 0, 0 : 1 : 0, and 1...

Inflation on the brane with vanishing gravity

Many existing models of brane inflation suffer from a steep irreducible gravitational2 potential between the branes that causes inflation to end too early. Inspired by the fact that point masses in 2+1 D exert no gravitational force, we propose a novel unwarped and non-supersymmetric setup for inflation, consisting of 3-branes in two extra dimensions compactified on a sphere. The...

Five-loop Konishi from the mirror TBA

We use the Thermodynamic Bethe Ansatz equations for the AdS5 ×S5 mirror model to derive the five-loop anomalous dimension of the Konishi operator. We show numerically that the corresponding result perfectly agrees with the one recently obtained via the generalized L¨uscher formulae. This constitutes an important test of the AdS/CFT TBA system.

Including a phase in the Bethe equations of the Hubbard model

We compute the Bethe equations of generalized Hubbard models, and study their thermodynamical limit. We argue how they can be connected to the ones found in the context of AdS/CFT correspondence, in particular with the so-called dressing phase problem. We also show how the models can be interpreted, in condensed matter physics, as integrable multi-leg Hubbard models.

The epsilon regime with twisted mass Wilson fermions

We investigate the leading lattice spacing effects in mesonic two-point correlators computed with twisted mass Wilson fermions in the epsilon-regime. By generalizing the procedure already introduced for the untwisted Wilson chiral effective theory, we extend the continuum chiral epsilon expansion to twisted mass WChPT. We define different regimes, depending on the relative power...

Virtual Compton scattering off a spinless target in AdS/QCD

We study the doubly virtual Compton scattering off a spinless target γ*P → γ*P′ within the Anti-de Sitter(AdS)/QCD formalism. We find that the general structure allowed by the Lorentz invariance and gauge invariance of the Compton amplitude is not easily reproduced with the standard recipes of the AdS/QCD correspondence. In the soft-photon regime, where the semi-classical...

New horizons for black holes and branes

We initiate a systematic scan of the landscape of black holes in any spacetime dimension using the recently proposed blackfold effective worldvolume theory. We focus primarily on asymptotically flat stationary vacuum solutions, where we uncover large classes of new black holes. These include helical black strings and black rings, black odd-spheres, for which the horizon is a...

Parton distributions for event generators

In this paper, conventional global QCD analysis is generalized to produce parton distribution functions (PDFs) optimized for use with event generators at the Large Hadron Collider (LHC). This optimization is accomplished by complementing usual constraints on the PDFs from the existing hard-scattering experimental data with those needed to reproduce cross sections for key...

Holomorphic variables in magnetized brane models with continuous Wilson lines

We analyze the action of the target-space modular group in toroidal type IIB orientifold compactifications with magnetized D-branes and continuous Wilson lines. The transformation of matter fields agree with that of twisted fields in heterotic compactifications, constituting a check of type I/heterotic duality. We identify the holomorphic \(\mathcal{N} \)= 1 variables for these...

Moduli stabilization and cosmology of type IIB on SU(2)-structure orientifolds

We consider type IIB flux compactifications on six-dimensional SU(2)-structure manifolds with O5- and O7-planes. These six-dimensional spaces allow not only for F 3 and H 3 fluxes but also for F 1 and F 5 fluxes. We derive the four-dimensional \( \mathcal {N} \) = 1 scalar potential for such compactifications and present one explicit example of a fully stabilized AdS vacuum with...

Neutrino oscillations: quantum mechanics vs. quantum field theory

A consistent description of neutrino oscillations requires either the quantum-mechanical (QM) wave packet approach or a quantum field theoretic (QFT) treatment. We compare these two approaches to neutrino oscillations and discuss the correspondence between them. In particular, we derive expressions for the QM neutrino wave packets from QFT and relate the free parameters of the QM...

Approximate R-symmetries and the μ term

We discuss the role of approximate U(1) R symmetries for the understanding of hierarchies in Nature. Such symmetries may explain a suppressed expectation value of the superpotential and provide us with a solution to the MSSM μ problem. We present various examples in field theory and string-derived models.

Deep inelastic scattering in conformal QCD

We consider the Regge limit of a CFT correlation function of two vector and two scalar operators, as appropriate to study small-x deep inelastic scattering in \( \mathcal{N} = 4 \) SYM or in QCD assuming approximate conformal symmetry. After clarifying the nature of the Regge limit for a CFT correlator, we use its conformal partial wave expansion to obtain an impact parameter...

Perturbative tests of non-perturbative counting

We observe that a class of quarter-BPS dyons in \( \mathcal{N} = 4 \) theories with charge vector (Q, P) and with nontrivial values of the arithmetic duality invariant I := gcd(Q∧P) are nonperturbative in one frame but perturbative in another frame. This observation suggests a test of the recently computed nonperturbative partition functions for dyons with nontrivial values of...

Quantum field theory, gravity and cosmology in a fractal universe

We propose a model for a power-counting renormalizable field theory living in a fractal spacetime. The action is Lorentz covariant and equipped with a Stieltjes measure. The system flows, even in a classical sense, from an ultraviolet regime where spacetime has Hausdorff dimension 2 to an infrared limit coinciding with a standard D-dimensional field theory. We discuss the...

Finite-temperature fractional D2-branes and the deconfinement transition in 2+1 dimensions

The supergravity dual to N regular and M fractional D2-branes on a cone over \( \mathbb{C}{\mathbb{P}^3} \) has a naked singularity in the infrared. One can resolve this singularity and obtain a regular fractional D2-brane solution dual to a confining 2+1 dimensional \( \mathcal{N} = 1 \) supersymmetric field theory. The confining vacuum of this theory is described by the...