Improved eV-scale sterile-neutrino constraints from the second KATRIN measurement campaign
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F22%3A00559786" target="_blank" >RIV/61389005:_____/22:00559786 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1103/PhysRevD.105.072004" target="_blank" >https://doi.org/10.1103/PhysRevD.105.072004</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevD.105.072004" target="_blank" >10.1103/PhysRevD.105.072004</a>
Alternative languages
Result language
angličtina
Original language name
Improved eV-scale sterile-neutrino constraints from the second KATRIN measurement campaign
Original language description
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.
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
<a href="/en/project/LTT19005" target="_blank" >LTT19005: Czech Participation at the International Experiment KATRIN</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review D
ISSN
2470-0010
e-ISSN
2470-0029
Volume of the periodical
105
Issue of the periodical within the volume
7
Country of publishing house
US - UNITED STATES
Number of pages
14
Pages from-to
072004
UT code for WoS article
000823543000001
EID of the result in the Scopus database
2-s2.0-85129379759