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Automated EW corrections with isolated photons: $t \bar t \gamma$, $t \bar t \gamma\gamma$ and $t \gamma j$ as case studies

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arxiv 2106.02059 v2 pith:BT6MT46K submitted 2021-06-03 hep-ph hep-ex

classification hep-phhep-ex
keywords gammaisolatedpredictionsleastphotonphotonsassociationautomated
verification ladder T0 review T1 audit T2 compute T3 formal
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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 ($ t \bar t \gamma$). We also compute NLO QCD+EW predictions for the similar case with at least two isolated photons ($ t \bar t \gamma\gamma$) 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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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. The inseparable three and four tops

    hep-ph 2026-07 conditional novelty 7.0 of 10

    Full-NLO predictions for tttW production, combined with tttt through a new window-removal prescription, give a joint inclusive rate more than 10% above the on-shell four-top prediction.

  2. One-loop amplitudes for $t\bar{t}j$ and $t\bar{t}\gamma$ productions at the LHC through $\mathcal{O}(\epsilon^2)$

    hep-ph 2025-05 unverdicted novelty 4.0 of 10

    Analytic expressions for one-loop helicity amplitudes in ttj and ttγ production are derived to O(ε²) as linear combinations of pentagon functions with rational coefficients in momentum-twistor variables, obtained via ...

  3. Progress in NLO Calculations for gamma-gamma Physics

    hep-ph 2025-08 conditional novelty 3.0 of 10

    The gamma-UPC+MG5_aMC framework is presented as the first automated NLO tool for photon-photon processes in UPCs, reviewed alongside recent fixed-order NLO results and data comparisons.

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