Sterile neutrino portal to Dark Matter II: exact dark symmetry

Escudero, Miguel, Rius, Nuria and Sanz, Verónica (2017) Sterile neutrino portal to Dark Matter II: exact dark symmetry. European Physical Journal C: Particles and Fields, 77 (6). a397. ISSN 1434-6044

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Abstract

We analyze a simple extension of the standard model (SM) with a dark sector composed of a scalar and a fermion, both singlets under the SM gauge group but charged under a dark sector symmetry group. Sterile neutrinos, which are singlets under both groups, mediate the interactions between the dark sector and the SM particles, and generate masses for the active neutrinos via the seesaw mechanism. We explore the parameter space region where the observed Dark Matter relic abundance is determined by the annihilation into sterile neutrinos, both for fermion and scalar Dark Matter particles. The scalar Dark Matter case provides an interesting alternative to the usual Higgs portal scenario. We also study the constraints from direct Dark Matter searches and the prospects for indirect detection via sterile neutrino decays to leptons, which may be able to rule out Dark Matter masses below and around 100 GeV.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Catrina Hey
Date Deposited: 04 Jul 2017 12:01
Last Modified: 04 Jul 2017 12:07
URI: http://sro.sussex.ac.uk/id/eprint/69037

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Particle Physics Theory at Royal Holloway and SussexG0742STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/J000477/1