Neutrino spin-flavor oscillations derived from the mass basis

2019

Eur. Phys. J. C

We further develop a recently proposed new approach to the description of the relativistic neutrino flavour ν L e ↔ ν L µ , spin ν L e ↔ ν R e and spin-flavour ν L e ↔ ν R µ oscillations in a constant magnetic field that is based on the use of the exact neutrino stationary states in the magnetic field. The neutrino flavour, spin and spin-flavour oscillations probabilities are calculated accounting for the whole set of possible conversions between four neutrino states. In general, the obtained expressions for the neutrino oscillations probabilities exhibit new inherent features in the oscillation patterns. It is shown, in particular, that: 1) in the presence of the transversal magnetic field for a given choice of parameters (the energy and magnetic moments of neutrinos and the strength of the magnetic field) the amplitude of the flavour oscillations ν L e ↔ ν L µ at the vacuum frequency is modulated by the magnetic field frequency, 2) the neutrino spin oscillation probability (without change of the neutrino flavour) exhibits the dependence on the mass square difference ∆m 2 . CONTENTS

Section: Introductionmentioning

confidence: 99%

Neutrino eigenstates and flavour, spin and spin-flavour oscillations in a constant magnetic field

Popov

2019

Eur. Phys. J. C

“…Here we use the analogous calculations to those performed in [25,26]. Note that only the third component of the current is responsible for the neutrino decay.…”

Section: Neutrino Quantum Decoherence Engendered By Neutrino Radimentioning

confidence: 99%

Neutrino quantum decoherence engendered by neutrino radiative decay

Stankevich

2020

Phys. Rev. D

A new theoretical framework, based on the quantum field theory of open systems applied to neutrinos, has been developed to describe the neutrino evolution in external environments accounting for the effect of the neutrino quantum decoherence. The developed new approach enables one to obtain the explicit expressions of the decoherence and relaxation parameters that account for a particular process, in which the neutrino participates, and also for the characteristics of an external environment and of the neutrino itself, including the neutrino energy. We have used this approach to consider a new mechanism of the neutrino quantum decoherence engendered by the neutrino radiative decay to photons and dark photons in an astrophysical environment. The importance of the performed studies is highlighted by the prospects of the forthcoming new large volume neutrino detectors that will provide new frontier in high-statistics measurements of neutrino fluxes from

“…Recently we have considered in detail [33,41] neutrino mixing and oscillations in the arbitrary constant magnetic field that have B ⊥ and B || nonzero components and derived an explicit expressions for the effective neutrino magnetic moments for the flavor neutrinos in terms of the corresponding magnetic moments introduced in the neutrino mass basis.…”

Section: A Brief History Of Neutrino Mixing and Oscillationsmentioning

confidence: 99%

“…define neutrino helicity states, we have performed calculations that are analogous to those performed in [41].…”

Section: Iii2 Quantum Treatmentmentioning

confidence: 99%

Neutrino spin and spin-flavor oscillations in transversal matter currents with standard and nonstandard interactions

Pustoshny

2018

Phys. Rev. D

After a brief history of two known types of neutrino mixing and oscillations, including neutrino spin and spin-flavor oscillations in the transversal magnetic field, we perform a systematic study of a new phenomenon of neutrino spin and spin-flavor oscillations engendered by the transversal matter currents on the bases of the developed quantum treatment of the phenomenon. Possibilities for the resonance amplification of these new types of oscillations by the longitudinal matter currents and longitudinal magnetic fields are analyzed. Neutrino spin-flavor oscillations engendered by the transversal matter currents in the case of nonstandard interactions of neutrinos with background matter are also considered.