Full top-quark mass dependence in diphoton production at NNLO in QCD

TL;DR

This paper presents the first calculation of diphoton production at NNLO in QCD including the full top quark mass dependence, providing more accurate predictions for relevant collider processes.

Contribution

It introduces the complete top quark mass dependence at NNLO in diphoton production, utilizing newly computed two-loop massive amplitudes.

Findings

Massive corrections are significant in certain kinematic regions.

The full top mass dependence affects the diphoton production cross section.

Numerical distributions highlight regions with notable mass effects.

Abstract

In this paper we consider the diphoton production in hadronic collisions at the next-to-next-to-leading order (NNLO) in perturbative QCD, taking into account for the first time the full top quark mass dependence up to two loops (full NNLO). We show selected numerical distributions, highlighting the kinematic regions where the massive corrections are more significant. We make use of the recently computed two-loop massive amplitudes for diphoton production in the quark annihilation channel. The remaining massive contributions at NNLO are also considered, and we comment on the weight of the different types of contributions to the full and complete result.