Associated production of a top quark with a photon via anomalous couplings

TL;DR

This paper investigates the production of a top quark with a photon through anomalous couplings, providing higher-order QCD corrections and demonstrating the significance of soft-gluon effects at LHC energies.

Contribution

It introduces a detailed calculation of soft-gluon corrections at aNNLO for top-photon production via anomalous couplings, enhancing precision in theoretical predictions.

Findings

Soft-gluon corrections are large and dominant.

Derived approximate NNLO cross sections and distributions.

Enhanced understanding of top-photon production at LHC energies.

Abstract

We discuss the associated production of a top quark with a photon via anomalous $t$-$q$-$\gamma$ couplings, and present higher-order corrections from soft-gluon emission for the processes $gq \rightarrow t\gamma$ at LHC energies. We perform soft-gluon resummation at next-to-leading-logarithm accuracy and derive approximate next-to-next-to-leading order (aNNLO) double-differential cross sections. We calculate at aNNLO the total $t\gamma$ production cross sections and the top-quark transverse-momentum and rapidity distributions for various LHC energies, and show that the soft-gluon corrections are large and dominant in these processes.