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SUMMARY:Manifestation of the neutrino magnetic moments in the high- energy
  neutrinos flavour ratios
DTSTART;VALUE=DATE-TIME:20241025T074500Z
DTEND;VALUE=DATE-TIME:20241025T080000Z
DTSTAMP;VALUE=DATE-TIME:20260819T061201Z
UID:indico-contribution-4314@cern.ch
DESCRIPTION:Speakers: Artem Popov (Moscow State University)\nNeutrino prop
 agation in Galactic and extragalactic magnetic fields is considered. We ex
 tend an approach developed in [1] to describe neutrino flavour and spin os
 cillations on astrophysical baselines using wave packets. The evolution eq
 uations for the neutrino wave packets in uniform and non-uniform magnetic 
 fields are derived. The analytical expressions for neutrino flavour and sp
 in oscillations probabilities accounting for damping due to the wave packe
 t separation are obtained for the case of a uniform magnetic field. It is 
 shown that terms in the flavour oscillations probabilities that depend on 
 the magnetic field strength are characterized by two coherence lengths. On
 e of the coherence lengths coincides with the coherence length for neutrin
 o oscillations in vacuum\, while the second one is proportional to the cub
 e of the average neutrino momentum $p_0^3$. The probabilities of flavour a
 nd spin oscillations are calculated numerically for neutrino interacting w
 ith the non-uniform Galactic magnetic field. It is shown that oscillations
  on certain frequencies are suppressed on the Galactic scale due to the ne
 utrino wave packets separation. The flavour compositions of high-energy ne
 utrino flux coming from the Galactic centre and ultra-high energy neutrino
 s from an extragalactic source are calculated accounting for neutrino inte
 raction with the magnetic field and decoherence due to the wave packet sep
 aration. It is shown that for neutrino magnetic moments $\\sim 10^{-13} \\
 mu_B$ and larger these flavour compositions significantly differ from ones
  predicted by the vacuum neutrino oscillations scenario.\n\nBased on:\n\n1
 ) A.Popov\, A.Studenikin\, "High-energy neutrinos flavour composition as a
  probe of neutrino magnetic moments"\, arXiv: https://arxiv.org/abs/2404.0
 2027.\n\n2) A.Popov\, A.Studenikin\, Manifestations of nonzero Majorana CP
 -violating phases in oscillations of supernova neutrinos\, Phys.Rev.D 103 
 (2021) 11\, 115027.\n\n3) A.Popov\, A.Studenikin\, Neutrino eigenstates an
 d flavour\, spin and spin-flavour oscillations in a constant magnetic fiel
 d\, Eur.Phys.J.C 79 (2019) 2\, 144.\n\nhttps://indico.particle.mephi.ru/ev
 ent/436/contributions/4314/
LOCATION: Moskvorechye 2
URL:https://indico.particle.mephi.ru/event/436/contributions/4314/
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