Date Mar 3, 2020, 4:00 pm – 4:00 pm Location 303 Jadwin Hall Share on X Share on Facebook Share on LinkedIn Speaker Alexander Mitov Affiliation Cavendish Lab, Cambridge Details Event Description For the last 5 years or so, there has been a major effort towards the calculation of two-loop 5-point QCD amplitudes and their corresponding LHC cross-sections at NNLO. Very recently, the first such calculation - 3-photon production - was completed [arXiv:1911.00479]. I will explain the novel features, and lessons learned, in regard to 5-point two-loop QCD amplitudes. I will also present a detailed comparison of the new NNLO predictions for 3-photon production with existing LHC measurements. Such a comparison is of particular interest given the discrepancy between NLO predictions and data. This calculation represents a stepping stone for tackling another LHC milestone: 3-jet production in NNLO QCD. An update on the ongoing 3-jet calculation will be given. The seminar should be of interest to both theorists and LHC experimentalists.