TY  - JOUR
AU  - Ahmed, Taushif
AU  - Chakraborty, Amlan
AU  - Chaubey, Ekta
AU  - Kaur, Mandeep
TI  - Two-loop helicity amplitudes for diphoton production with massive quark loop
JO  - Journal of high energy physics
VL  - 12
IS  - 12
SN  - 1126-6708
CY  - Heidelberg
PB  - Springer
M1  - PUBDB-2026-00021
M1  - DESY-25-017
M1  - arXiv:2502.03282
M1  - TIF-UNIMI-2025-4
M1  - BONN-TH-2025-01
SP  - 106
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.
KW  - Factorization (autogen)
KW  - Renormalization Group (autogen)
KW  - Higher-Order Perturbative Calculations (autogen)
KW  - Top Quark (autogen)
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1007/JHEP12(2025)106
UR  - https://bib-pubdb1.desy.de/record/643123
ER  -