Počet záznamů: 1
Improved eV-scale sterile-neutrino constraints from the second KATRIN measurement campaign
- 1.
SYSNO ASEP 0559786 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Improved eV-scale sterile-neutrino constraints from the second KATRIN measurement campaign Tvůrce(i) Aker, M. (DE)
Batzler, D. (DE)
Beglarian, A. (DE)
Behrens, J. (DE)
Dragoun, Otokar (UJF-V) RID, SAI
Kovalík, Alojz (UJF-V) RID, ORCID, SAI
Lebeda, Ondřej (UJF-V) RID, ORCID, SAI
Ráliš, Jan (UJF-V) SAI
Ryšavý, Miloš (UJF-V) RID, ORCID, SAI
Vénos, Drahoslav (UJF-V) RID, SAI, ORCIDCelkový počet autorů 130 Číslo článku 072004 Zdroj.dok. Physical Review D. - : American Physical Society - ISSN 2470-0010
Roč. 105, č. 7 (2022)Poč.str. 14 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova KATRIN ; neutrino Obor OECD Astronomy (including astrophysics,space science) CEP LTT19005 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Způsob publikování Open access Institucionální podpora UJF-V - RVO:61389005 UT WOS 000823543000001 EID SCOPUS 85129379759 DOI 10.1103/PhysRevD.105.072004 Anotace We present the results of the light sterile neutrino search from the second Karlsruhe Tritium Neutrino (KATRIN) measurement campaign in 2019. Approaching nominal activity, 3.76 x 10(6) tritium ss-electrons are analyzed in an energy window extending down to 40 eV below the tritium end point at E-0 = 18.57 keV. We consider the 3 nu + 1 framework with three active and one sterile neutrino flavors. The analysis is sensitive to a fourth mass eigenstate m(4)(2) less than or similar to 1600 eV(2) and active-to-sterile mixing |U-e4|(2) greater than or similar to 6 x 10(-3). As no sterile-neutrino signal was observed, we provide improved exclusion contours on m(4)(2) and |U-e4|(2) at 95% C.L. Our results supersede the limits from the Mainz and Troitsk experiments. Furthermore, we are able to exclude the large Delta m(41)(2) solutions of the reactor antineutrino and gallium anomalies to a great extent. The latter has recently been reaffirmed by the BEST Collaboration and could be explained by a sterile neutrino with large mixing. While the remaining solutions at small Delta m(41)(2) are mostly excluded by short-baseline reactor experiments, KATRIN is the only ongoing laboratory experiment to be sensitive to relevant solutions at large Delta m(41)(2) through a robust spectral shape analysis. Pracoviště Ústav jaderné fyziky Kontakt Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Rok sběru 2023 Elektronická adresa https://doi.org/10.1103/PhysRevD.105.072004
Počet záznamů: 1