Inclusive top-pair production phenomenology with TOPIXS

TL;DR

This paper introduces TOPIXS, a new computational tool for precise top-quark pair production cross section calculations at the Tevatron and LHC, incorporating advanced resummation and bound-state effects.

Contribution

The paper presents TOPIXS, a flexible program that performs next-to-next-to-leading logarithmic accuracy calculations including recent NNLO results, for both standard and hypothetical heavy quarks.

Findings

Calculated top-pair cross sections at 8 TeV LHC energy.

Studied the impact of LHC top measurements on gluon distribution fits.

Analyzed dependence on parton distribution functions.

Abstract

We discuss various aspects of inclusive top-quark pair production based on TOPIXS, a new, flexible program that computes the production cross section at the Tevatron and LHC at next-to-next-to-leading logarithmic accuracy in soft and Coulomb resummation, including bound-state effects and the complete next-to-next-to-leading order result in the q-qbar channel, which has recently become available. We present the calculation of the top-pair cross section in pp collisions at 8 TeV centre-of-mass energy, as well as the cross sections for hypothetical heavy quarks in extensions of the standard model. The dependence on the parton distribution input is studied. Further we investigate the impact of LHC top cross section measurements at sqrt(s)=7 TeV on global fits of the gluon distribution using the NNPDF re-weighting method.