@misc{10481/106208,
year = {2025},
month = {7},
url = {https://hdl.handle.net/10481/106208},
abstract = {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 fnal detector, are presented. A sample of 5828
neutrino candidates has been selected from the analysed exposure of 433 kton-years. The
ντ normalisation, defned as the ratio between the number of observed and expected tau
neutrino events, is measured to be Sτ = 0.48+0.5
−0.33. This translates into a ντ charged-current
cross section measurement of σ
meas
τ = (2.5
+2.6
−1.8
) × 10−38 cm2 nucleon−1 at the median ντ
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 afecting the τ -row of the neutrino
mixing matrix was improved, with α33 > 0.95 at the 95% confdence level.},
organization = {European Union Horizon 2020 Europe Research and Innovation Programme (grants 101079679, 101142396, 101008324)},
organization = {European Union — NextGenerationEU (grants CUP I57G21000040001, PRTR-C17.I01, CSIC-INFRA23013 and for CNS2023-144099)},
publisher = {Springer},
keywords = {Beyond Standard Model},
keywords = {Neutrino Detectors and Telescopes (experiments)},
keywords = {Oscillation},
title = {Study of tau neutrinos and non-unitary neutrino mixing with the frst six detection units of KM3NeT/ORCA},
doi = {10.1007/JHEP07(2025)213},
author = {Aiello, S. and The KM3NeT Collaboration, / and Díaz, A. F.},
}