Two-loop helicity amplitudes for diphoton production with massive quark loop
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866915139861610496 |
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| author | Ahmed, Taushif Chakraborty, Amlan Chaubey, Ekta Kaur, Mandeep |
| author_facet | Ahmed, Taushif Chakraborty, Amlan Chaubey, Ekta Kaur, Mandeep |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_03282 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Two-loop helicity amplitudes for diphoton production with massive quark loop Ahmed, Taushif Chakraborty, Amlan Chaubey, Ekta Kaur, Mandeep High Energy Physics - Phenomenology High Energy Physics - Theory 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. |
| title | Two-loop helicity amplitudes for diphoton production with massive quark loop |
| topic | High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2502.03282 |