2018-10-26  P7F

New Physics and the Higgs Trilinear Coupling

Spencer Chang

Measuring the Higgs trilinear coupling is one of the most important physics drivers of the high-luminosity LHC, given its insight into the mechanism of electroweak symmetry breaking.  In the near term, only large deviations from the Standard Model value will be probable; so in this talk, I will consider some of the model-dependent and model-independent implications of such a deviation.  I will discuss how indirect constraints from precision electroweak observables and unitarity are relatively weak.  As our calculation demonstrates, even with order one deviations, unitarity only requires new physics at ~10 TeV.  I will also discuss a model where the Higgs trilinear can be substantially modified called "induced electroweak symmetry breaking".  In these models, to satisfy current constraints a heavier Higgs boson must exist, motivating a set of complementary searches for this correlated signal.