Speaker
Description
We generalize the pseudo-Dirac dark matter (pDDM) model, already considered in the literature in the context of effective field theories. In particular, we consider a simplified model in which a heavy $Z'$-vector boson couples the Standard Model sector to a Dirac fermion whose mass eigenstates are slightly separated in mass, with separation $\Delta m$. The lightest eigenstate (of mass $m_1$) is stable, and then represents a natural candidate for dark matter. The heaviest one, on the other hand, is unstable and can leave a trace at colliders in the form of jet(s)+missing energy. The effective cross section for coannihilations, which determines the relic abundance of DM, can be related to the predictions for collider signatures, and these can be used together to fix several free parameters of the model. As a result, for specific efficiency cuts and luminosity, we provide excluded regions in the $(m_1,\Delta m)$ plane, due to the lack of any signal at LHC.
| Author's Name | Alessandro Davoli |
|---|---|
| Author's Institute | SISSA |
| Author's e-mail | adavoli@sissa.it |
| Abstract Title | Pseudo-Dirac dark matter revisited |
| Subject | BSM+DM |
