Discovery-HET Seminar: Ilaria Brivio (Madrid)

Speaker: Ilaria Brivio (Madrid)

Title: Non-linear Higgs portals to Dark Matter

Abstract: If (part of) the Dark Matter is made of singlet scalar particles, its dominant interaction with the visible sector is the so-called Higgs portal. This possibility is quite attractive because of its simplicity and has received increasing attention after the discovery of the Higgs boson. This talk, based on 1511.01099, will focus on how the phenomenology of the Higgs portal is altered depending on whether the electroweak symmetry breaking is realised linearly (e.g. in SUSY) or non-linearly (e.g. in composite Higgs models). For the former scenario, the most appropriate formalism is that of a linear effective expansion, while a chiral effective Lagrangian best describes the latter: as a consequence, the leading interactions of the DM with gauge bosons and with the physical Higgs are remarkably different in the two cases. This deeply affects the DM relic abundance, as well as the expected signals both in direct detection and collider experiments.