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

Journal Article · · Physical Review Letters
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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 of mass m4. The analysis is sensitive to a fourth mass state m$$^{2}_{4}$$ ≲ 1000 eV2 and to active-to-sterile neutrino mixing down to |Ue4|2 ≳ 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 and improve the Troitsk bound for m$$^{2}_{4}$$ < 30eV2. The reactor and gallium anomalies are constrained for 100 < Δm$$^{2}_{41}$$ <1000 eV2

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); University of North Carolina, Chapel Hill, NC (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
Helmholtz Association; German Research Foundation (DFG); Ministry of Science and Higher Education of the Russian Federation; USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
KATRIN Collaboration
Grant/Contract Number:
FG02-97ER41020; FG02-94ER40818; SC0004036; FG02-97ER41033; FG02-97ER41041; AC02-05CH11231; SC0011091; SC0019304; VH-NG-1055; 5A17PDA; 05A17PM3; 05A17PX3; 05A17VK2; 05A17WO3; CANAM-LM2011019; LTT19005; 075-15-2020-778
OSTI ID:
1769455
Alternate ID(s):
OSTI ID: 1807488; OSTI ID: 1834077; OSTI ID: 1907699
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Vol. 126 Journal Issue: 9; ISSN 0031-9007
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
sterile neutrinos
73 NUCLEAR PHYSICS AND RADIATION PHYSICS