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

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.

18 pages, 11 figures, minor changes, version submitted for publication

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• Top physics at the LHC
• Complete NLO corrections to top-quark pair production with isolated photons
• Associated production of a top-quark pair with two isolated photons at the LHC through NLO in QCD
• Spin Polarisation of $t\bar{t}\gamma \gamma$ production at NLO+PS with GoSam interfaced to MadGraph5_aMC@NLO
• Les Houches 2023 -- Physics at TeV Colliders: Report on the Standard Model Precision Wishlist