TY  - EJOUR
AU  - Ahmed, Taushif
AU  - Chakraborty, Amlan
AU  - Chaubey, Ekta
AU  - Kaur, Mandeep
TI  - Two-loop helicity amplitudes for diphoton production with massive quark loop
IS  - DESY-25-017
M1  - PUBDB-2025-00533
M1  - DESY-25-017
M1  - arXiv:2502.03282
M1  - TIF-UNIMI-2025-4
M1  - BONN-TH-2025-01
PY  - 2025
N1  - Ancillary files at DOI: https://zenodo.org/records/14809206
AB  - 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.
LB  - PUB:(DE-HGF)25
DO  - DOI:10.3204/PUBDB-2025-00533
UR  - https://bib-pubdb1.desy.de/record/622862
ER  -