Electroweak Radiative Corrections to Single-top Production

TL;DR

This paper presents complete one-loop electroweak corrections to single top production processes, introduces a new regularisation method for infrared divergences, and provides computational modules for use in LHC simulations.

Contribution

It provides a comprehensive calculation of electroweak corrections and develops modules integrated into the SANC system for improved simulation accuracy.

Findings

Electroweak corrections are significant for single top production.

New regularisation method effectively handles infrared divergences.

Modules are validated against existing literature and systems.

Abstract

Radiative corrections to the single top s and t channel production processes are revisited. Complete one-loop electroweak corrections are calculated within the SANC system. New is a study of the regularisation of the top-legs associated infrared divergences with aid of the complex mass of the top quark. A comparison of these electroweak corrections with those computed by the conventional method is presented both for top production and decays. Standard FORM and FORTRAN SANC modules are created. These modules are compiled into a package sanc_cc_v1.40, which may be downloaded from SANC project homepages. Many numerical results are presented at the partonic level with the aim to demonstrate the correct working of modules. These modules are intended to be used in Monte Carlo generators for single top production at the LHC. Where possible, we compare our results with those existing in the literature; in particular, a comprehensive comparison with results of the CompHEP system is given.