Preprint

PUBDB-2025-00533

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Two-loop helicity amplitudes for diphoton production with massive quark loop

Ahmed, T. ; Chakraborty, A. ; Chaubey, E. ; Kaur, M. (Corresponding author)DESY*

2025

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Please use a persistent id in citations: doi:10.3204/PUBDB-2025-00533

Report No.: BONN-TH-2025-01; DESY-25-017; TIF-UNIMI-2025-4; arXiv:2502.03282

Abstract: 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 $\overline{\rm MS}$ 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.

Note: Ancillary files at DOI: https://zenodo.org/records/14809206

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Contributing Institute(s):

1. Zeuthen Particle PhysicsTheory (Z_ZPPT)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. LoCoMotive - Loop Corrections from the Theory of Motives (101043686) (101043686)

Experiment(s):

1. LHC: CMS
2. LHC: ATLAS

Appears in the scientific report 2025

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