We discuss W boson production at HERA including NLO QCD corrections. A detailed comparison with previous work is presented.

Supersymmetry predicts that gauge couplings are equal to the corresponding gauginosfermion-fermion Yukawa couplings. This prediction can be tested for the QCD sector of the MSSM by studying the processes e+e− → squark+antisquark+gluon and e+e− → squark+antiquark+gluino at a future linear collider. We present results for these processes at next-to-leading order in αs in the framework of the MSSM...

The partial widths are determined for stop decays to top quarks and gluinos, and gluino decays to stop particles and top quarks (depending on the masses of the particles involved). The widths are calculated including one-loop SUSYQCD corrections. The radiative corrections for these strong-interaction decays are compared with the SUSY-QCD corrections for electroweak stop decays to quarks and neu...

We present NLO QCD results for Wbb̄ and Zbb̄ production at the Tevatron including full bottomquark mass effects. We study the impact of QCD corrections on both total cross-section and invariant mass distribution of the bottom-quark pair. Including NLO QCD corrections greatly reduces the dependence of the tree-level cross-section on the renormalization and factorization scales. We also compare our...

Kubo's formula relates bulk viscosity to the retarded Green's function of the trace of the energy-momentum tensor. Using low energy theorems of QCD for the latter we derive the formula which relates the bulk viscosity to the energy density and pressure of hot matter. We then employ the available lattice QCD data to extract the bulk viscosity as a function of temperature. We find that close to t...