Journal
NUCLEAR PHYSICS B
Volume 866, Issue 2, Pages 177-195Publisher
ELSEVIER
DOI: 10.1016/j.nuclphysb.2012.08.019
Keywords
keV sterile neutrinos; Beta decay; Warm dark matter
Categories
Funding
- Spanish Ministry of Science and Education [FIS 2008-01301, FIS 2011-23565, FPA 2010-17142, FIS 2008-01323]
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Sterile neutrinos with mass in the range of one to a few keV are important as extensions of the Standard Model of particle physics and are serious dark matter (DM) candidates. This DM mass scale (warm DM) is in agreement with both cosmological and galactic observations. We study the role of a keV sterile neutrino through its mixing with a light active neutrino in rhenium 187 and tritium beta decays. We pinpoint the energy spectrum of the beta particle, 0 less than or similar to T-e less than or similar to (Q(beta) - m(s)), as the region where a sterile neutrino could be detected and where its mass m(s) could be measured. This energy region is at least 1 keV away from the region suitable to measure the mass of the light active neutrino, located near the endpoint Q beta. The emission of a keV sterile neutrino in a beta decay could show up as a small kink in the spectrum of the emitted beta particle. With this in view, we perform a careful calculation of the rhenium and tritium beta spectra and estimate the size of this perturbation by means of the dimensionless ratio R. of the sterile neutrino to the active neutrino contributions. We comment on the possibility of searching for sterile neutrino signatures in two experiments which are currently running at present. MARE and KATRIN, focused on the rhenium 187 and tritium beta decays respectively. (C) 2012 Elsevier B.V. All rights reserved.
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