Soft-Gluon Corrections in FCNC Top-Quark Production via Anomalous Gluon Couplings

TL;DR

This paper calculates soft-gluon corrections for flavor-changing neutral current top-quark production involving anomalous gluon couplings, enabling improved theoretical predictions at higher orders.

Contribution

It provides the first explicit calculation of the soft anomalous dimension matrix at one-loop for this process, facilitating threshold resummation at NLL accuracy.

Findings

Explicit one-loop soft anomalous dimension matrix derived

Resummation at next-to-leading-logarithm accuracy achieved

Expressions for NLO and NNLO soft-gluon corrections obtained

Abstract

We present a calculation of soft-gluon corrections in FCNC top-quark production via anomalous $t$-$q$-$g$ couplings. The soft anomalous dimension matrix is explicitly calculated at one-loop accuracy. This calculation allows threshold resummation at next-to-leading-logarithm accuracy. We also derive expressions for the soft-gluon corrections at NLO and at NNLO.