Bound on 3+1 Active-Sterile Neutrino Mixing from the First Four-Week Science Run of KATRIN

0541437 - ÚJF 2022 RIV US eng J - Článek v odborném periodiku
Aker, M. - Altenmuller, K. - Beglarian, A. - Behrens, J. - Berlev, A. I. - Besserer, U. - Dragoun, Otokar - Kovalík, Alojz - Lebeda, Ondřej - Ryšavý, Miloš - Vénos, Drahoslav … celkem 129 autorů
Bound on 3+1 Active-Sterile Neutrino Mixing from the First Four-Week Science Run of KATRIN.
Physical Review Letters. Roč. 126, č. 9 (2021), č. článku 091803. ISSN 0031-9007. E-ISSN 1079-7114
Grant CEP: GA MŠMT LTT19005; GA MŠMT LM2015056
Výzkumná infrastruktura: CANAM II - 90056
Institucionální podpora: RVO:61389005
Klíčová slova: beta decay * sterile neutrinos * neutrons
Obor OECD: Nuclear related engineering
Impakt faktor: 9.185, rok: 2021
Způsob publikování: Open access
https://doi.org/10.1103/PhysRevLett.126.091803

We report on the light sterile neutrino search from the first four-week science run of the KATRIN experiment in 2019. Beta-decay electrons from a high-purity gaseous molecular tritium source are analyzed by a high-resolution MAC-E filter down to 40 eV below the endpoint at 18.57 keV. We consider the framework with three active neutrinos and one sterile neutrino. The analysis is sensitive to the mass, m(4), of the fourth mass state for m(4)(2) less than or similar to 1000 eV(2) and to active-to-sterile neutrino mixing down to vertical bar U-e4 vertical bar greater than or similar to 2 x 10(-2). No significant spectral distortion is observed and exclusion bounds on the sterile mass and mixing are reported. These new limits supersede the Mainz results for m(4)(2) less than or similar to 1000 eV(2) and improve the Troitsk bound for m(4)(2) < 30 eV(2). The reactor and gallium anomalies are constrained for 100 < Delta m(41)(2) < 1000 eV(2).
Trvalý link: http://hdl.handle.net/11104/0318993