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

SYSNO ASEP	0541437
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Bound on 3+1 Active-Sterile Neutrino Mixing from the First Four-Week Science Run of KATRIN
Author(s)	Aker, M. (DE) Altenmuller, K. (DE) Beglarian, A. (DE) Behrens, J. (DE) Berlev, A. I. (RU) Besserer, U. (DE) Dragoun, Otokar (UJF-V)_{RID, SAI} Kovalík, Alojz (UJF-V)_{RID, ORCID, SAI} Lebeda, Ondřej (UJF-V)_{RID, ORCID, SAI} Ryšavý, Miloš (UJF-V)_{RID, ORCID, SAI} Vénos, Drahoslav (UJF-V)_{RID, SAI, ORCID}
Number of authors	129
Article number	091803
Source Title	Physical Review Letters. - : American Physical Society - ISSN 0031-9007 Roč. 126, č. 9 (2021)
Number of pages	7 s.
Publication form	Print - P
Language	eng - English
Country	US - United States
Keywords	beta decay ; sterile neutrinos ; neutrons
Subject RIV	BG - Nuclear, Atomic and Molecular Physics, Colliders
OECD category	Nuclear related engineering
R&D Projects	LTT19005 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
	LM2015056 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
Research Infrastructure	CANAM II - 90056 - Ústav jaderné fyziky AV ČR, v. v. i.
Method of publishing	Open access
Institutional support	UJF-V - RVO:61389005
UT WOS	000627618200006
EID SCOPUS	85102174835
DOI	10.1103/PhysRevLett.126.091803
Annotation	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).
Workplace	Nuclear Physics Institute
Contact	Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228
Year of Publishing	2022
Electronic address	https://doi.org/10.1103/PhysRevLett.126.091803

Number of the records: 1