Hadroproduction of t anti-t pair with two isolated photons with PowHel

TL;DR

This paper presents NLO accurate predictions for the production of a top-antitop pair with two isolated photons at the LHC, using the PowHel simulation package, and compares these to Higgs decay backgrounds.

Contribution

It provides the first NLO predictions for t anti-t plus two photons production with detailed differential distributions at the hadron level.

Findings

Predictions include differential distributions at NLO accuracy.

Comparison shows the background's kinematic similarity to Higgs decay signals.

Results aid in Higgs boson studies and background estimation.

Abstract

We simulate the hadroproduction of a t anti-t pair in association with two isolated hard photons at 13 TeV LHC using the PowHel package. We use the generated events, stored according to the Les-Houches event format, to make predictions for differential distributions formally at the next-to-leading order (NLO) accuracy. We present predictions at the hadron level employing the cone-type isolation of the photons used by experiments. We also compare the kinematic distributions to the same distributions obtained in the t anti-t H final state when the Higgs-boson decays into a photon pair, to which the process discussed here is an irreducible background.