APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker: Spencer Chang (University of Oregon/National Taiwan University)
Title: The Higgs Trilinear Coupling and the Scale of New Physics
Date: Wed, Mar 20, 2019, 13:30 - 14:30
Place: Seminar Room A
Abstract: Measuring the Higgs trilinear coupling is one of the most important physics drivers of the high-luminosity LHC and future colliders, given its insight into the mechanism of electroweak symmetry breaking. After a review of proposed collider probes for this interaction, I will demonstrate how a nonstandard value for this coupling predicts unitarity violation at high energies. Depending on the theoretical assumptions, this occurs at energies above 5-13 TeV for an order one trilinear modification. This gives a model independent argument for the energy scale where new physics has to appear by, motivating an energy target for future colliders.