Article history: Received 16 October 2009 Received in revised form 22 December 2009 Accepted 8 January 2010 Available online 16 January 2010 Editor: W. Haxton The new state of matter produced at Relativistic Heavy Ion Collider reveals a strongly coupled quark– gluon plasma with an extremely small shear viscosity to entropy density ratio η/s. We calculate the η/s of an equilibrated hadron matter...

We study neutrino interactions in a hadron gas within a relativistic framework. The hadron matter is described by a non-interacting Fermi gas in beta equilibrium. We show that the introduction of relativistic effects causes a sizable enhancement of the neutrino-scattering cross sections. Neutrino interactions are pivotal in the dynamics of core-collapse supernova explosions and in the cooling o...

Rather than regarding the restriction of current lattice QCD simulations to quark masses that are 5–10 times larger than those observed, we note that this presents a wonderful opportunity to deepen our understanding of QCD. Just as it has been possible to learn a great deal about QCD by treating Nc as a variable, so the study of hadron properties as a function of quark mass is leading us to a m...

Experimental collaborations for the large hadron collider conducted various searches supersymmetry. In absence of signals, lower limits were put on sparticle masses but usually within frameworks with (over-)simplifications relative to entire indications by supersymmetry models. For complementing current interpretations experimental bounds, we introduce a 30-parameter version R-parity conserving...

I describe how hadron-hadron scattering amplitudes are related to the eigenstates of QCD in a finite cubic volume. The discrete spectrum of such eigenstates can be determined from correlation functions computed using lattice QCD, and the corresponding scattering amplitudes extracted. I review results from the Hadron Spectrum Collaboration who have used these finite volume methods to study ππ el...

Single-top-quark production via W -gluon fusion at hadron colliders provides an opportunity to directly probe the charged-current interaction of the top quark. We calculate the next-to-leading-order corrections to this process at the Fermilab Tevatron, the CERN Large Hadron Collider, and DESY HERA. Using a b-quark distribution function to sum collinear logarithms, we show that there are two ind...

This review talk discusses some issues of active research in perturbative QCD. Among the topics discussed are, heavy flavor and prompt photon production in hadron-hadron collisions, “small x” phenomena and the current status of αs. Invited talk presented at the 1994 Meeting of The Division of Particles and Fields of the American Physical Society, Albuquerque NM, August 1-6, 1994 This work was s...

We present an exploratory QCD analysis of the neutrino structure functions in charged current DIS using the color dipole formalism. The corresponding dipole cross sections are taken from recent phenomenological/theoretical studies in deep inelastic inclusive production. The theoretical predictions are compared to the available experimental results in the small-x region. In particular, the behav...