26-30 July 2021
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Europe/Berlin timezone

Neutrino decay processes and flavour oscillations

Not scheduled
20m
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Poster Neutrino Physics T04: Neutrino Physics

Speaker

Alexey Lichkunov (Lomonosov Moscow State University)

Description

The phenomenon of neutrino oscillations emerges due to coherent superposition of neutrino mass states. An external environment can modify a neutrino evolution in a way that the coherence will be violated. Such violation is called quantum decoherence of neutrino mass states and leads to the suppression of flavor oscillations. In our previous paper [1], we presented a new theoretical framework, based on the quantum field theory of open systems applied to neutrinos. Within this framework we proposed and considered a new mechanism of the neutrino quantum decoherence engendered by the neutrino radiative decay in an electron background in an extreme astrophysical environment. In the present study we generalize our approach and consider neutrino radiative decay accounting for the neutrino magnetic moment and milicharge. We also account for the neutrino decay into a hypothetical scalar particle (that can be a familon or another axion-like particle). We show that such decays can also lead to the neutrino quantum decoherence. Using the experimental constraints on neutrino quantum decoherence [2] we estimate the neutrino decay rates.

[1] K.Stankevich, A.Studenikin, Neutrino quantum decoherence engendered by neutrino radiative decay, Phys. Rev. D 101 (2020) 056004.

[2] J.A.B.Coelho, W.A.Mann, Decoherence, matter effect, and neutrino hierarchy signature in long baseline experiments, Phys. Rev. D 96 (2017) 093009.

This work is supported by the Russian Foundation for Basic Research under grant No. 20-52-53022-GFEN-a. The work of KS is also supported by the Russian Foundation for Basic Research under grant No. 20-32-90107 and by the BASIS Foundation No. 20-2-2-3-1. The work of MV is also supported by the BASIS Foundation No. 20-2-1-25-1.

Email lichkunov.aa15@physics.msu.ru
First author Alexey Lidhkunov
Collaboration / Activity None

Primary author

Alexey Lichkunov (Lomonosov Moscow State University)

Co-authors

Alexander Studenikin (Moscow State University and JINR-Dubna) Konstantin Stankevich (Faculty of Physics of Moscow State University) Mr Maxim VIalkov (Lomonosov Moscow State University)

Presentation Materials