%0 Electronic Article
%A Ahmed, Taushif
%A Chakraborty, Amlan
%A Chaubey, Ekta
%A Kaur, Mandeep
%T Two-loop helicity amplitudes for diphoton production with massive quark loop
%N DESY-25-017
%M PUBDB-2025-00533
%M DESY-25-017
%M arXiv:2502.03282
%M TIF-UNIMI-2025-4
%M BONN-TH-2025-01
%D 2025
%Z Ancillary files at DOI: https://zenodo.org/records/14809206
%X We compute two-loop helicity amplitudes in QCD for diphoton production through quark- and gluon-initiated channels, accounting for a massive internal quark loop by keeping its full mass dependence. Using physical projectors, we directly decompose the amplitude into its helicity components. By renormalising the heavy quark mass in on-shell, and other quantities in ―MS schemes, we obtain finite remainders. This work paves the way for calculating the cross-section for diphoton production at higher orders in QCD with a massive quark loop, employing different subtraction schemes. The effect of a heavy quark is expected to play a crucial role in high-luminosity LHC.
%F PUB:(DE-HGF)25
%9 Preprint
%R 10.3204/PUBDB-2025-00533
%U https://bib-pubdb1.desy.de/record/622862