Production-decay interferences at NLO in QCD for t-channel single-top production

TL;DR

This paper calculates next-to-leading order QCD corrections for t-channel single-top production, including interference effects between production and decay, extending previous work beyond the narrow-width approximation.

Contribution

It introduces a comprehensive NLO calculation that accounts for production-decay interference effects in single-top processes, surpassing earlier narrow-width approximations.

Findings

Includes virtual and real corrections from interference effects

Extends calculations beyond narrow-width approximation

Provides more accurate predictions for single-top production

Abstract

We present a calculation of O(\alpha_s) contributions to the process of t-channel single-top production and decay, which include virtual and real corrections arising from interference of the production and decay subprocesses. The calculation is organized as a simultaneous expansion of the matrix elements in the couplings \alpha_{ew},\alpha_s and the virtuality of the intermediate top quark, (p_t^2-m_t^2)/m_t^2 ~ \Gamma_t/m_t, and extends earlier results beyond the narrow-width approximation.