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Automated EW corrections with isolated photons: ttγ, ttγγ and tγj as case studies

Abstract : In this work we compute for the first time the so-called Complete-NLO predictions for top-quark pair hadroproduction in association with at least one isolated photon (ttγ). We also compute NLO QCD+EW predictions for the similar case with at least two isolated photons (ttγγ) and for single-top hadroproduction in association with at least one isolated photon. In addition, we complement our results with NLO QCD+EW predictions of the hadronic and leptonic decays of top-quark including an isolated photon. All these results have been obtained in a completely automated approach, by extending the capabilities of the MadGraph5_aMC@NLO framework and enabling the Complete-NLO predictions for processes with isolated photons in the final state. We discuss the technical details of the implementation, which involves a mixed EW renormalisation scheme for such processes.
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Submitted on : Tuesday, October 5, 2021 - 3:35:27 PM
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Davide Pagani, Hua-Sheng Shao, Ioannis Tsinikos, Marco Zaro. Automated EW corrections with isolated photons: ttγ, ttγγ and tγj as case studies. Journal of High Energy Physics, Springer Verlag (Germany), 2021, 2021 (9), ⟨10.1007/JHEP09(2021)155⟩. ⟨hal-03366217⟩

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