arXiv subjects

Gabriele Fiore

Publications and source records attributed to Gabriele Fiore.

2 recordsLinked to original sources

arXiv2025

Electroweak corrections to $gg\rightarrow \gamma\gamma$

We present the electroweak corrections for the production of a photon pair through gluon fusion, focusing on the contribution from the first two generations of quarks. The two-loop amplitude is calculated using a series of projection operators which define scalar form factors. In order to evaluate the Master Integrals which appear in this process we employ both generalized polylogarithms and Chen-iterated integrals. In order to perform a phenomenological study we develop a semi-numerical evaluation of the Master Integrals employing a fitting procedure to speed up the evaluation of burdensome higher weight contributions. We present results for the LHC, finding corrections of around a couple of percent to the leading order $gg \rightarrow \gamma\gamma$ process. Our results are implemented into the parton-level Monte Carlo code \texttt{MCFM}.

hep-ph↗

arXiv2023

Master Integrals for Electroweak corrections to $gg \to\gamma\gamma$ -- Light quark contributions

We present a calculation of the master integrals (MI's) required for the calculation of the Electroweak corrections to $gg\rightarrow \gamma\gamma$ production in which the process contains a light quark loop. The integrals can be broken down into five categories based on the flow of the heavy vector bosons throughout the loop. Three of the families are planar, and two are non-planar. We determine a canonical basis for each family which allows an efficient solution of the resulting differential equations via iterated integrals. We calculate the families in relevant physical kinematics and obtain an efficient numerical evaluation based on an implementation of Chen-iterated integrals.

hep-ph↗