Speaker
Description
It is known [1] that neutrino electromagnetic interactions open a window to new physics. The present talk is dedicated to new results of our recently performed detailed studies of new effects in neutrino spin, spin-flavour and flavor oscillations under the influence of the transversal matter currents [2] and a constant magnetic field [3]. These two effects can be summarized as follows:
1) it is shown [2] that neutrino spin and spin-flavor oscillations can be engendered by weak interactions of neutrinos with the medium in the case when there are the transversal matter currents (for the appearance of neutrino spin oscillations in this case there is no need either for a neutrino nonzero magnetic moment or for an external magnetic field); different possibilities for the resonance amplification of these new kind of oscillations are discussed, the neutrino Standard Model and non-standard interactions are accounted for, the effect of an external magnetic field is also considered;
2) within a new treatment [3] of the neutrino flavor, spin and spin-flavour oscillations in the presence of a constant magnetic field, that is based on the use of the exact neutrino stationary states in the magnetic field, it is shown that there is an interplay of neutrino oscillations on different frequencies; in particular: a) the amplitude of the flavour oscillations νeL↔ νμL at the vacuum frequency is modulated by the magnetic field frequency ω = μν B , and b) the neutrino spin oscillation νeL↔ νeR probability in the magnetic field exhibits the dependence on the neutrino mass square difference Δm2 .
The discovered new phenomena in neutrino oscillations should be accounted for reinterpretation of results of already performed experiments on detection of astrophysical neutrino fluxes produced in astrophysical environments with strong magnetic fields and dense matter. These new neutrino oscillation phenomena are also of interest in view of future experiments on observations of supernova neutrino fluxes with large liquid-scintillator detectors like JUNO.
References:
[1] C. Guinti and A. Studenikin,
“Neutrino electromagnetic interactions: A window to new physics”,
Rev. Mod. Phys. 87 (2015) 531-591.
[2] P. Pustoshny, A. Studenikin,
"Neutrino spin and spin-flavour oscillations in transversal matter currents with standard and non-standard interactions", Phys.Rev. D98 (2018) no.11, 113009.
[3] A. Popov, A. Studenikin, "Neutrino eigenstates and flavour, spin and spin-flavour oscillations in a constant magnetic field ", Eur.Phys.J. C79 (2019) no.2, 144.
