The rates governing momentum broadening in a quark-gluon plasma with a momentum anisotropy are calculated to leading-log order for a heavy quark using kinetic theory. It is shown how the problematic singularity for these rates at leading-oder is lifted by next-to-leading order gluon self-energy corrections to give a finite contribution to the leading-log result. The resulting rates are shown to...

S. Chatrchyan et al.* (CMS Collaboration) (Received 17 August 2011; published 14 November 2011) A new measurement of the inclusive production cross section for pp ! t t is performed at a center-ofmass energy of 7 TeV using data collected by the CMS experiment at the LHC. The analysis uses a data sample corresponding to an integrated luminosity of 36 pb , and is based on the final state with one...

In models of electroweak symmetry breaking in which the SM fermions get their masses by mixing with composite states, it is natural to expect the top quark to show properties of compositeness. We study the phenomenological viability of having a mostly composite top. The strongest constraints are shown to come from one-loop contributions to the T -parameter. Nevertheless, the presence of light c...

It is shown that the quark–gluon interaction induced by instan-tons leads to the quark anomalous chromomagnetic moment. In the instanton-liquid model for the QCD vacuum, the chromomagnetic moment is µ a = − πf 2αs , where f is the packing fraction of instantons in the vacuum.

We use the recombination and the Thomas Precession Model to obtain a prediction for the Λ0 polarization in the p+ p → Λ0 +X reaction. We study the effect of the recombination function on the Λ0 polarization. INTRODUCTION The unexpected discovery of large polarization in inclusive Λ0 production by unpolarized protons has shown that important spin effects arise in the hadronization process. Sever...

Article history: Received 10 April 2015 Received in revised form 4 July 2015 Accepted 16 July 2015 Available online 21 July 2015 Editor: J.-P. Blaizot Quark number susceptibility on the lattice, obtained by merely adding a μN term with μ as the chemical potential and N as the conserved quark number, has a quadratic divergence in the cut-off a. We show that such a divergence already exists for f...

A review on the requirements of chiral symmetry on effective quark models is presented. The connection between the pion Salpeter amplitude and the mass gap equation is discussed. Hadronic scattering, notably, π π scattering is presented. The constraints imposed by chiral symmetry between difractive quark scattering and quark-quark annihilation is presented. Hadronic coupled channels as a conseq...

We tested two pipelines developed for template-free protein structure prediction in the CASP11 experiment. First, the QUARK pipeline constructs structure models by reassembling fragments of continuously distributed lengths excised from unrelated proteins. Five free-modeling (FM) targets have the model successfully constructed by QUARK with a TM-score above 0.4, including the first model of T083...