Tau neutrino magnetic moments from the Super-Kamiokande and $ν$ e-scattering data

Abstract

Combined results on $ν_μ\to ν_τ$ oscillations and $νe$-scattering from the Super-Kamiokande and LAMPF experiments, respectively, limit the Dirac $ν_τ$ diagonal magnetic moment to $μ_{ν_τ} < 1.9\times 10^{-9} μ_{B}$. For the scheme with 3 Majorana neutrinos the LAMPF results allow the limitation of effective $ν_τ$ magnetic moment to $μ_{ν_τ} < 7.6 \times 10^{-10}μ_{B}$. The moments in the scheme with additional Majorana light sterile neutrinos as well as experiments on stimulated radiative neutrino conversion are also discussed.