Showing 2008 · hep-phShow all

32 papers · 2 filters

hep-ph2008★ 6 cited

Light-Front Holography and Novel Effects in QCD

Stanley J. Brodsky, Guy F. de Teramond

The correspondence between theories in anti-de Sitter space and conformal field theories in physical space-time leads to an analytic, semiclassical model for strongly-coupled QCD.…

hep-ph2008★ 47 cited

Local Two-Photon Couplings and the J=0 Fixed Pole in Real and Virtual Compton Scattering

Stanley J. Brodsky, Felipe J. Llanes-Estrada, Adam P. Szczepaniak

The local coupling of two photons to the fundamental quark currents of a hadron gives an energy-independent contribution to the Compton amplitude proportional to the charge squared…

hep-ph2008★ 11 cited

Strongly Coupled Semi-Direct Mediation of Supersymmetry Breaking

M. Ibe, K. -I. Izawa, Y. Nakai

Strongly coupled semi-direct gauge mediation models of supersymmetry breaking through massive mediators with standard model charges are investigated by means of composite degrees o…

hep-ph2008★ 139 cited

Astrophysical Probes of Unification

Asimina Arvanitaki, Savas Dimopoulos, Sergei Dubovsky +3

Traditional ideas for testing unification involve searching for the decay of the proton and its branching modes. We point out that several astrophysical experiments are now reachin…

hep-ph2008★ 226 cited

Breit-Wigner Enhancement of Dark Matter Annihilation

Masahiro Ibe, Hitoshi Murayama, T. T. Yanagida

We point out that annihilation of dark matter in the galactic halo can be enhanced relative to that in the early universe due to a Breit-Wigner tail, if the dark matter annihilates…

hep-ph2008★ 2.3k cited

Event generation with SHERPA 1.1

T. Gleisberg, S. Hoeche, F. Krauss +4

In this paper the current release of the Monte Carlo event generator Sherpa, version 1.1, is presented. Sherpa is a general-purpose tool for the simulation of particle collisions a…

hep-ph2008★ 12 cited

Dynamic versus Static Structure Functions and Novel Diffractive Effects in QCD

Stanley J. Brodsky

Initial- and final-state rescattering, neglected in the parton model, have a profound effect in QCD hard-scattering reactions, predicting single-spin asymmetries, diffractive deep…

hep-ph2008

AdS/QCD and its Holographic Light-Front Partonic Representation

Guy F. de Teramond, Stanley J. Brodsky

Starting from the Hamiltonian equation of motion in QCD we find a single variable light-front equation for QCD which determines the eigenspectrum and the light-front wavefunctions…

hep-ph2008★ 117 cited

An Effective Theory of Dirac Dark Matter

Roni Harnik, Graham D. Kribs

A stable Dirac fermion with four-fermion interactions to leptons suppressed by a scale Lambda ~ 1 TeV is shown to provide a viable candidate for dark matter. The thermal relic abun…

hep-ph2008★ 255 cited

QCD radiation in the production of heavy colored particles at the LHC

Johan Alwall, Simon de Visscher, Fabio Maltoni

We present a study of effects of QCD radiation in the production of heavy colored states, employing inclusive multi-jet samples obtained by matching matrix elements and parton show…

hep-ph2008★ 69 cited

Signals of New Physics in the Underlying Event

Roni Harnik, Tommer Wizansky

LHC searches for new physics focus on combinations of hard physics objects. In this work we propose a qualitatively different soft signal for new physics at the LHC - the "anomalou…

hep-ph2008★ 34 cited

R-axion detection at LHC

Hock-Seng Goh, Masahiro Ibe

Supersymmetric models with spontaneously broken approximate R-symmetry contain a light spin 0 particle, the R-axion. The properties of the particle can be a powerful probe of the s…

hep-ph2008★ 11 cited

New Dimensions for Randall-Sundrum Phenomenology

Hooman Davoudiasl, Thomas G. Rizzo

We consider a 6D extension of the Randall-Sundrum (RS) model, RS6, where the Standard Model (SM) gauge fields are allowed to propagate in an additional dimension, compactified on $…

hep-ph2008★ 336 cited

Light-Front Holography: A First Approximation to QCD

Guy F. de Teramond, Stanley J. Brodsky

Starting from the Hamiltonian equation of motion in QCD, we identify an invariant light-front coordinate which allows the separation of the dynamics of quark and gluon binding…

hep-ph2008★ 83 cited

Cold nuclear matter effects on J/psi production: intrinsic and extrinsic transverse momentum effects

E. G. Ferreiro, F. Fleuret, J. P. Lansberg +1

Cold nuclear matter effects on J/psi production in proton-nucleus and nucleus-nucleus collisions are evaluated taking into account the specific J/psi production kinematics at the p…

hep-ph2008★ 7 cited

Unique Signatures of Unparticle Resonances at the LHC

Thomas G. Rizzo

The coupling of unparticles to the Standard Model (SM) Higgs boson leads to a breaking of conformal symmetry which produces an effective mass term in the unparticle propagator. Sim…

hep-ph2008★ 151 cited

Model-Independent Jets plus Missing Energy Searches

Johan Alwall, My-Phuong Le, Mariangela Lisanti +1

We present a proposal for performing model-independent jets plus missing energy searches. Currently, these searches are optimized for mSUGRA and are consequently not sensitive to a…

hep-ph2008★ 1k cited

Comix, a new matrix element generator

Tanju Gleisberg, Stefan Hoeche

We present a new tree-level matrix element generator, based on the colour dressed Berends-Giele recursive relations. We discuss two new algorithms for phase space integration, dedi…

hep-ph2008★ 22 cited

One-Loop Calculations with BlackHat

C. F. Berger, Z. Bern, L. J. Dixon +5

We describe BlackHat, an automated C++ program for calculating one-loop amplitudes, and the techniques used in its construction. These include the unitarity method and on-shell rec…

hep-ph2008★ 27 cited

Light-Front Holography and Hadronization at the Amplitude Level

Stanley J. Brodsky, Guy de Teramond, Robert Shrock

The correspondence between theories in anti-de Sitter space and conformal field theories in physical space-time leads to an analytic, semiclassical model for strongly-coupled QCD w…

hep-ph2008★ 19 cited

Identification of the Origin of Monojet Signatures at the LHC

Thomas G. Rizzo

Several new physics scenarios can lead to monojet signatures at the LHC. If such events are observed above the Standard Model background it will be important to identify their orig…

hep-ph2008★ 1 cited

Z' Coupling Information from the LHeC

Thomas G. Rizzo

If the LHC discovers a -like state the extraction of its couplings to the particles of the Standard Model becomes mandatory in order to determine the nature of the underlying n…

hep-ph2008★ 43 cited

The Baryon Anomaly: Evidence for Color Transparency and Direct Hadron Production at RHIC

Stanley J. Brodsky, Anne Sickles

We show that the QCD color transparency of higher-twist contributions to inclusive hadroproduction cross sections, where baryons are produced directly in a short-distance subproces…

hep-ph2008★ 119 cited

From loops to trees by-passing Feynman's theorem

Stefano Catani, Tanju Gleisberg, Frank Krauss +2

We derive a duality relation between one-loop integrals and phase-space integrals emerging from them through single cuts. The duality relation is realized by a modification of the…