O n l i n e T a l k : 6-May-2021
EW physics at very high energies: A multi-TeV muon collider as a case study
The Standard Model electroweak sector exhibits some novel features at very high energies. For E >> v (the Higgs vev), the EW gauge symmetry is essentially restored and the massless splitting phenomena dominate the EW physics. Beyond the familiar gauge theory splitting functions, we discuss the emergence of additional ``ultra-collinear'' splitting phenomena and the violation of the Goldstone-boson Equivalence Theorem. We implement the formalism for the EW PDFs at high energies, and demonstrate the unique physics potential in searching for new physics beyond the Standard Model, taking a multi-TeV muon collider as a case study.