Study of tau neutrinos and non-unitary neutrino mixing with the first six detection units of KM3NeT/ORCA

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21670%2F25%3A00384866" target="_blank" >RIV/68407700:21670/25:00384866 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1007/JHEP07(2025)213" target="_blank" >https://doi.org/10.1007/JHEP07(2025)213</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/JHEP07(2025)213" target="_blank" >10.1007/JHEP07(2025)213</a>

Result language

angličtina

Original language name

Study of tau neutrinos and non-unitary neutrino mixing with the first six detection units of KM3NeT/ORCA

Original language description

Oscillations of atmospheric muon and electron neutrinos produce tau neutrinos with energies in the GeV range, which can be observed by the ORCA detector of the KM3NeT neutrino telescope in the Mediterranean Sea. First measurements with ORCA6, an early subarray corresponding to about 5% of the final detector, are presented. A sample of 5828 neutrino candidates has been selected from the analysed exposure of 433 kton-years. The nu(tau) normalisation, defined as the ratio between the number of observed and expected tau neutrino events, is measured to be S-tau= 0.48+0.5(-0.33). This translates into a nu(tau) charged-current cross section measurement of sigma(meas)(tau)= (2.5(-1.8)(+2.6))x10(-38) cm(2) nucleon(-1) at the median nu(tau) energy of 20.3 GeV. The result is consistent with the measurements of other experiments. In addition, the current limit on the non-unitarity parameter affecting the tau-row of the neutrino mixing matrix was improved, with alpha(33) > 0.95 at the 95% confidence level.

Czech name

—

Czech description

—

Type

J_imp - 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)

Project

<a href="/en/project/GA24-12702S" target="_blank" >GA24-12702S: Experimental and theoretical studies of astrophysical high-energy neutrinos in KM3NeT neutrino telescopes</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of High Energy Physics

ISSN

1029-8479

e-ISSN

1029-8479

Volume of the periodical

—

Issue of the periodical within the volume

7

Country of publishing house

DE - GERMANY

Number of pages

27

Pages from-to

1-27

UT code for WoS article

001536391800001

EID of the result in the Scopus database

2-s2.0-105016244135