Physics Commons^™

The Theoretical Top Quark Cross Section At The Tevatron And The Lhc, Nikolaos Kidonakis, Ramona Vogt

Faculty and Research Publications

We present results for the top quark pair cross section at the Tevatron and the LHC. We use the resummed double differential cross section, employing the fully kinematics-dependent soft-anomalous-dimension matrices, to calculate the soft-gluon contributions at next-to-next-to-leading order (NNLO). We improve and update our previous estimates by refining our methods, including further subleading terms, and employing the most recent parton distribution function sets. The NNLO soft corrections significantly enhance the NLO cross section while considerably reducing the scale dependence. We provide a detailed discussion of all theoretical uncertainties in our calculation, including kinematics, scale, and parton distribution uncertainties, and clarify …

Soft And Collinear Enhancements To Top Quark And Higgs Cross Sections, Nikolaos Kidonakis

Faculty and Research Publications

I present calculations of soft and collinear corrections to the cross-sections for single top quark production, and for Higgs production via bb H at the Tevatron and the LHC. I show that the corrections provide significant enhancements to the cross-sections in both cases. For single top production the soft gluon corrections dominate the cross-section, particularly in the s-channel and in tW production. For Higgs production it is shown that purely collinear terms have to be included as well to provide an accurate calculation.

W Production At Large Transverse Momentum At The Large Hadron Collider, Richard J. Gonsalves, Nikolaos Kidonakis, Agustín Sabio Vera

Faculty and Research Publications

We study the production of W bosons at large transverse momentum in pp collisions at the Large Hadron Collider (LHC). We calculate the complete next-to-leading order (NLO) corrections to the differential cross section. We find that the NLO corrections provide a large increase to the cross section but, surprisingly, do not reduce the scale dependence relative to leading order (LO). We also calculate next-to-next-to-leading-order (NNLO) soft-gluon corrections and find that, although they are small, they significantly reduce the scale dependence thus providing a more stable theoretical prediction.

Large-Qt W-Boson Production At The Tevatron, Nikolaos Kidonakis, Agustín Sabio Vera

Faculty and Research Publications

The production of W bosons at large transverse momentum at the Tevatron is dominated by soft-gluon corrections. In this talk we present a calculation of these corrections at next-to-next-to-leading order. The corrections enhance the transverse momentum distribution of the W while reducing the scale dependence.

Read More: http://www.worldscientific.com/doi/abs/10.1142/S0217751X05026236