Abstract
AbstractWe present a theoretical framework for systematically calculating next-to-leading order (NLO) QCD effects to various experimental observables in models with massive COVB in a model independent way at hadron colliders. Specifically, we show the numerical results for the NLO QCD corrections to total cross sections, invariant mass distribution and AFB of top quark pairs production mediated by a massive COVB in both the fixed scale (top quark mass) scheme and the dynamical scale (top pair invariant mass) scheme. Our results show that the NLO QCD calculations in the dynamical scale scheme is more reasonable than the fixed scheme and the naive estimate of the NLO effects by simple rescaling of the LO results with the SM NLO K-factor is not appropriate.
Highlights
It is well known that QCD effects play an important role in ttproduction
We present the model independent complete next-to-leading order (NLO) QCD corrections to top quark pair production mediated by a general massive Color-Octet Vector Boson (COVB), and show the detailed numerical analysis of top quark pair production, including invariant mass distribution and AFB at the NLO level
We present the results in two benchmark schemes, namely the fixed scale scheme (FSS), i.e. the scales are fixed to be mt, and the dynamical scale scheme (DSS), i.e. the scales are set to be the invariant mass of top quark pair mtt
Summary
It is well known that QCD effects play an important role in ttproduction. The NLO QCD corrections to SM ttproduction, which significantly enhance the tttotal cross sections, have been calculated for a long time [19,20,21]. Complete NLO corrections to this observable are not available currently, but calculation based on soft gluon resummation indicates that higher order QCD effects are small [22].
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