Theory Seminar - Elina Fuchs, UChicago

1:30 pm MCP 201

Relaxion Phenomenology
Elina Fuchs, UChicago

The relaxion, a light pseudoscalar, offers a dynamical solution to the hierarchy problem by scanning the Higgs mass. A back reaction potential lets the relaxion stop at a field value that yields the observed Higgs mass and breaks CP. The resulting CP-violating relaxion-Higgs mixing provides a powerful way to search for the relaxion over many orders of magnitude in the mass and mixing angle.This requires a combination of experimental probes, e.g. from torsion balance via beam dumps to colliders. In this talk I provide an overview of the relaxion parameter space and emphasize the sensitivity of the LHC and future colliders to the relaxion and other light (pseudo)scalars. An important process is the exotic Higgs decay into a relaxion pair that - depending on the relaxion's lifetime - gives rise to untagged or invisible final states or displaced vertices.

Event Type

Seminars

Jan 8