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T: Fachverband Teilchenphysik

T 103: Neutrino Physics without Accelerators 8

T 103.5: Talk

Thursday, March 24, 2022, 17:15–17:30, T-H35

Neutrino decoherence effects with KM3NeT — •Nadja Lessing for the ANTARES-KM3NET-ERLANGEN collaboration — Friedrich-Alexander-Universität Erlangen-Nürnberg

Quantum decoherence of neutrino states is an effect that is proposed in different theories of quantum gravity. It is envisaged to emerge from interactions of the neutrino as a quantum system with the environment and could modify the probabilities of neutrino flavour oscillations in various ways. Therefore, neutrino telescopes such as KM3NeT, that are sensitive to different flavours and to oscillations in a wide range of neutrino energies, can ideally probe this effect. ORCA and ARCA are water Cherenkov detectors that are currently under construction by the KM3NeT Collaboration in the Mediterranean Sea. While ARCA is primarily designed to detect high energy cosmic neutrinos, ORCA aims at the precise measurement of atmospheric neutrino oscillations. This contribution reports on the decoherence sensitivity for both detectors using a phenomenological model in a three-family framework including matter effects. It is shown that, considering different energy dependencies of the phenomenon, either ORCA or ARCA might be capable of improving current bounds on the strength of decoherence effects.