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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GA24-12702S" target="_blank" >GA24-12702S: Experimentální a teoretický výzkum astrofyzikálních vysokoenergetických neutrin v neutrinovém teleskopu KM3NeT</a><br>

Návaznosti

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

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Journal of High Energy Physics

ISSN

1029-8479

e-ISSN

1029-8479

Svazek periodika

—

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

27

Strana od-do

1-27

Kód UT WoS článku

001536391800001

EID výsledku v databázi Scopus

2-s2.0-105016244135