A hypercharge-portal model mediated by a Chern-Simons-type term and its phenomenology
by
Florian Domingo(DESY)
→
Europe/Berlin
Buildg. 2a, Sem.R. 2 (DESY Hamburg)
Buildg. 2a, Sem.R. 2
DESY Hamburg
Description
In the presence of two decoupling vector fields, the Standard Model lagrangian can be extended by a generalized Chern-Simons term, opening a hypercharge portal into this hidden sector. If additionally a Z2 symmetry is required, the lightest of the new vector fields is promoted to a suitable Dark-Matter candidate. We study the phenomenology of this model, considering limits from colliders as well as Dark Matter searches. The prominent signature consists in the prediction of monochromatic gamma-ray lines. We show that this scenario is consistent with existing constraints, two regions of interest in the parameter space being the one compatible with thermal relic density and that corresponding to the tentative gamma-line at 135 GeV.
