Associated production of a top-quark pair with two isolated photons at the LHC through NLO in QCD

Journal of High Energy Physics, vol. 2023

Abstract

Abstract We report on the computation of NLO QCD corrections to top-quark pair production in association with two photons at the LHC. Higher-order effects and photon bremsstrahlung are taken into account in the production and decays of the top-quark pair. Top-quark and W-boson decays are treated in the Narrow Width Approximation conserving spin correlations up to NLO in QCD. This is the first time that the complete set of NLO QCD corrections to the $$ pp\to t\overline{t}\gamma \gamma $$ pp → t t ¯ γγ process including top-quark decays is calculated. We present results at the integrated and differential cross-section level in the di-lepton and lepton + jet channel. In addition, we investigate the effect of photon bremsstrahlung in $$ t\overline{t} $$ t t ¯ production and top-quark decays, as well as the mixed contribution. The latter contribution, in which two photons occur simultaneously in the production and decay of the $$ t\overline{t} $$ t t ¯ pair, proved to be significant at both the integrated and differential cross-section level.

Authors 2

1. Daniel Stremmer Aachen Institute for Theoretical Particle Physics and Cosmology

   RWTH Aachen University

   Affiliation as printed

   Institute for Theoretical Particle Physics and Cosmology, RWTH Aachen University, D-52056, Aachen, Germany

2. Małgorzata Worek corresponding Aachen Institute for Theoretical Particle Physics and Cosmology

   RWTH Aachen University

   Affiliation as printed

   Institute for Theoretical Particle Physics and Cosmology, RWTH Aachen University, D-52056, Aachen, Germany