Precision QCD phenomenology for multi-scale processes at the Large-Hadron-Collider

by Rene Poncelet (IFJ PAN)

Thursday 25 Apr 2024, 11:00 → 13:00 UTC

Precision phenomenology of Standard Model (SM) processes is a staple of the LHC physics programme, facilitating the extraction of SM parameters, the development of simulation tools and the search for new physics. Studying the production of highly energetic jets and photons allows us to test Quantum Chromodynamics (QCD) at the highest energy scales. Calculating higher-order QCD corrections is necessary to tame arising theoretical uncertainties and to profit from the ever-increasing experimental precision. The effort to push the computation of QCD corrections to the second order in perturbation theory (next-to-next-to-leading order, NNLO) led to an improved interpretation of LHC data and a broad range of applications ranging from PDF fits to indirect new physics searches. In this presentation, I will discuss challenges and techniques for NNLO QCD calculations and their applications to the phenomenology of processes with multiple kinematic scales, specifically "two-to-three" processes such as three-jet production at the LHC.