Fabrizio Caola - Three-loop scattering amplitudes in QCD

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• Fabrizio Caola (Oxford)
• Friday 24 June 2022, 16:00-17:00
• Potter Room (B1.19).

If you have a question about this talk, please contact Maeve Madigan.

The seminar takes place in person in the Potter Room at DAMPT and a broadcast is available via zoom: https://us02web.zoom.us/j/85896693592?pwd=cDBJMVJJNlkwcG9FWFBJNTJmTTJyQT09

Abstract: Scattering amplitudes are key ingredients for any QFT prediction. Although the recent past saw many interesting results for scattering amplitudes in planar N=4 SYM , these cannot easily be generalised to beyond the planar limit or to less symmetric theories. As a result, much less is known for amplitudes in realistic theories. In this talk, I will describe a recent calculation of three-loop 2 → 2 QCD scattering amplitudes, beyond the planar limit. After discussing the main features of the computation, I will also illustrate with few examples how these results can be used for LHC phenomenology and for improving our understanding of the structure of perturbative gauge theories. Specifically, I will discuss how one can use the gg → γγ 3-loop amplitude to better constrain the Higgs lifetime, and the elastic parton-parton scattering amplitudes to investigate the Regge limit of QCD .

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.

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