Standard SANC modules for NLO QCD radiative corrections to single top-quark production

Abstract

It this paper we present the results obtained with the newly created Standard SANC modules for calculation of the NLO QCD corrections to single top production processes in s and t channels at the partonic level, as well as top-decays. The main aim of these results is to prove the correct work of modules. A comprehensive comparison with results of the CompHEP system is given, where possible. These modules are intended to be used in Monte Carlo generators for single top production processes at the LHC. As in our recent paper, devoted to the electroweak corrections to these processes, we study the regularization of the top-legs associated infrared divergences with aid of the complex mass of the top quark. A comparison of QCD corrections with those computed by the conventional method is presented both for top production and decays. For s channel production we give an analytic proof of equivalence of the two methods in the limit of low top width.

Precision studies of observables in $$p p \rightarrow W \rightarrow l\nu _l$$ p p → W → l ν l and $$ pp \rightarrow \gamma ,Z \rightarrow l^+ l^-$$ p p → γ , Z → l + l - processes at the LHC

“…Although the MiNLO Sudakov form factor is not formally NNLL accurate, very good numerical agreement has been observed between dedicated resummation calculations of the vector boson transverse momentum and DYNNLOPS. The SANC system (Support for Analytic and Numeric Calculations for experiments at colliders) [113] implements calculations of complete (real and virtual) NLO QCD and EW corrections for the Drell-Yan CC [19] and NC [20] processes, associative Higgs and gauge boson production [114], single top production [115,116] and several other processes at the partonic level. Here we give a brief summary of the main properties of this framework.…”