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

Abstract

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

Comments: 12 pages, To appear in Phys. Lett. B