Speaker
Description
The oscillation of neutrinos has been measured in various channels since its experimental confirmation in 1998. However, there are only few observations of the tau neutrino appearance with large uncertainties. Better constraints on $|U_{\tau3}|^2$ are needed to probe the unitarity of the PMNS matrix U in the third mass eigenstate column $\left| U_{e3} \right|^2 + \left| U_{\mu 3} \right|^2 + \left| U_{\tau 3} \right|^2 = 1$. KM3NeT consist of two water-Cherenkov neutrino telescopes being deployed in the Mediterranean sea, near the coasts of France and Italy. In particular KM3NeT/ORCA, is optimised to measure the neutrino oscillation properties. Thanks to its compact geometrical layout it is sensitive to atmospheric neutrinos with energies as low as 3 GeV adequate to perform non unitarity tests. This contribution will report on the new results of testing the non unitarity of the neutrino mixing, obtained using an early six-lines configuration of the ORCA detector (ORCA6), with data recorded in 2020 and 2021.
| Poster prize | Yes |
|---|---|
| Given name | Luc |
| Surname | Cerisy |
| First affiliation | CPPM |
| Institutional email | cerisy@cppm.in2p3.fr |
| Gender | Male |
| Collaboration (if any) | KM3NeT |
