Two-loop QCD corrections for real and off-shell diphoton and triphoton production via quark loops
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866909862334562304 |
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| author | Kermanschah, Dario Vicini, Matilde |
| author_facet | Kermanschah, Dario Vicini, Matilde |
| contents | We compute squared matrix elements at next-to-next-to-leading order in perturbative quantum chromodynamics for the production of two or three (on- or off-shell) photons mediated via (light or heavy) quark loops. Our method handles all cases in a unified framework, using simultaneous subtraction of infrared, ultraviolet, and threshold singularities in loop momentum space to produce a locally finite integrand suitable for numerical integration. We confirm agreement with available analytic benchmarks at fixed phase-space points and provide new results otherwise. We also compute the double-virtual corrections to the cross section for on- and off-shell diphoton and on-shell triphoton production by combining the Monte Carlo integration over loop and phase space. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_18801 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Two-loop QCD corrections for real and off-shell diphoton and triphoton production via quark loops Kermanschah, Dario Vicini, Matilde High Energy Physics - Phenomenology We compute squared matrix elements at next-to-next-to-leading order in perturbative quantum chromodynamics for the production of two or three (on- or off-shell) photons mediated via (light or heavy) quark loops. Our method handles all cases in a unified framework, using simultaneous subtraction of infrared, ultraviolet, and threshold singularities in loop momentum space to produce a locally finite integrand suitable for numerical integration. We confirm agreement with available analytic benchmarks at fixed phase-space points and provide new results otherwise. We also compute the double-virtual corrections to the cross section for on- and off-shell diphoton and on-shell triphoton production by combining the Monte Carlo integration over loop and phase space. |
| title | Two-loop QCD corrections for real and off-shell diphoton and triphoton production via quark loops |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2510.18801 |