A.A. Gvozdev

Radiative decay of the massive neutrino in external electromagnetic fields

The radiative decay of the massive neutrino {nu}{sub {ital i}}{r_arrow}{nu}{sub {ital j}}{gamma} is investigated in the framework of the standard model in external electromagnetic fields of various configurations: constant crossed field, constant uniform magnetic field, plane monochromatic wave{close_quote}s field. The effect of significant enhancement of the neutrino decay probability by the external field (electromagnetic catalysis) is discussed. An especially strong enhancement occurs in the case of the ultrarelativistic neutrino decay, since in this case the decay probability does not contain suppression caused by the smallness of the decaying neutrino mass. The ultrarelativistic neutrino decay catalysis is significant even in a relatively weak external field ({ital F}/{ital F}{sub {ital e}}{lt}1, where {ital F}{sub {ital e}} is the critical Schwinger value). The expression for the photon splitting probability into a neutrino pair {gamma}{r_arrow}{nu}{sub {ital i}}{bar {nu}}{sub {ital j}} in the wave field is given. The estimations of a number of {gamma} quanta produced in a volume filled with an electromagnetic field and the neutrino lifetime in a strong magnetic field are presented. {copyright} {ital 1996 The American Physical Society.}

The magnetic catalysis of the radiative decay of a massive neutrino in the standard model with lepton mixing

Abstract The radiative decay of the massive neutrino in a magnetic field is analysed in detail in the framework of the standard model with lepton mixing. The phenomenon of a magnetic catalysis of the decay is discovered. The magnetic catalysis is significant in a strong magnetic field ( B⪢B e =m e 2 e≅4.41 × 10 13 G ) ;the effect is more pronounced in the case of the decay of an ultrarelativistic neutrino ( E v ⪢ m v ), even in a relatively weak electromagnetic field ( ϵB⪡m e 2 e ) .

Resonance neutrino bremsstrahlung ν → νγ in a strong magnetic field

Abstract High energy neutrino bremsstrahlung ν → ν + γ in a strong magnetic field (B ⪢ Bs) is studied in the framework of the Standard Model (SM). A resonance probability and a four-vector of the neutrino energy and momentum loss are presented. A possible manifestation of the neutrino bremsstrahlung in astrophysical cataclysm of type of a supernova explosion or a merger of neutron stars, as an origin of cosmological γ-burst is briefly discussed.

Electromagnetic catalysis of the radiative transitions of vi → vjγ type in the field of an intense monochromatic wave

The radiative decay of the massive neutrino

The radiative decay of a high energy neutrino in the Coulomb field of a nucleus

\nu_i \rightarrow \nu_j \gamma

Muon decays with lepton-number violation via vector leptoquark

in a circularly polarized electromagnetic wave is investigated within the Standard theory with lepton mixing. The decay probability in the wave field does not contain a threshold factor

The radiative decay νi→νjγ (i≠j) of a massive neutrino in the field of an intensive electromagnetic wave

\sim ( 1 - m_i / m_j )

The electroweak KL0→μ+μ− process as a probe of the top quark mass

as opposed to the decay probability in a vacuum or in a constant uniform external field. The phenomenon of the gigantic enhancement (

Off-diagonal electroweak transition Fi→Fjγ∗γ∗ with virtual photons in the standard theory with fermion mixing

\sim 10^{33}

Resonance neutrino bremsstrahlung ? ? ?? in a strong magnetic field

) of the neutrino decay probability in external wave field is discovered. The probability of the photon splitting into the neutrino pair is obtained. (Published in Phys.Lett.B 321 (1994) 108).The radiative decay of the massive neutrino