Aachen 2019 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 64: Theorie: Dunkle Materie

T 64.4: Vortrag

Mittwoch, 27. März 2019, 16:45–17:00, S16

Dark matter in supersymmetrical Inverse-Seesaw models — •Yang Liu — Institute fuer Theoretische Physik und Astrophysik, Universitaet Wuerzburg, Deutschland

We consider two supersymmetrical models, where the neutrino masses and mixings can be explained by the additional sterile neutrinos. The first model is based on the Seesaw-I mechanism where the structure of the Yukawa coupling is the one of an Inverse-seesaw. In this model, the dark matter consists of two components: the lightest right-handed neutrino with a mass in keV range and the lightest sneutrino. We show that this model has two problems: (i) The results from NuSTAR collaboration constrain the mixing between the active and sterile neutrinos and therefore excludes this part of the parameterspace. (ii) The contribution from the sneutrino part is in this scenario too large.

The sneutrino contribution of the dark matter can be reduced through the resonance in the annhilation processes. Therefore we considered the former model as the effective model of a theory with expaned U(1)_B−L gauge group. This model contains an additional lightest Higgs boson with a relative large coupling to the right-handed sneutrinos. We show that with help of a "Higgs-Funnel", the observed dark matter density can be explained while respecting the constraints from collider experiments.