Higher-order corrections for $tZ$ production via anomalous couplings

TL;DR

This paper calculates higher-order soft-gluon corrections for $tZ$ production via anomalous couplings at the LHC, providing more accurate cross sections and distributions, and demonstrating the significance of these corrections.

Contribution

It introduces approximate NNLO calculations for $tZ$ production with anomalous couplings using soft-gluon resummation at NLL accuracy, enhancing precision in theoretical predictions.

Findings

Soft-gluon corrections are dominant and sizable for $tZ$ production.

Approximate NNLO cross sections improve prediction accuracy.

Distributions of top-quark transverse momentum and rapidity are provided at aNNLO.

Abstract

I present higher-order corrections from soft-gluon emission for the associated production of a top quark with a $Z$ boson via anomalous $t$-$q$-$Z$ couplings at LHC energies. Approximate next-to-next-to-leading order (aNNLO) double-differential cross sections are derived from soft-gluon resummation at next-to-leading-logarithm accuracy. The total $tZ$ production cross sections and the top-quark transverse-momentum and rapidity distributions are calculated at aNNLO for various LHC energies. It is shown that the soft-gluon corrections are dominant and large for this process.