New limits on neutrino magnetic moment through non-vanishing 13-mixing

Understand

The relatively large value of neutrino mixing angle \theta_{13} set by recent measurements allows us to use solar neutrinos to set a limit on neutrino magnetic moment involving second and third families, \mu_{\mu\tau}.

• The existence of a random magnetic field in solar convective zone can produce a significant anti-neutrino flux when a non-vanishing neutrino magnetic moment is assumed.
• Even if we consider a vanishing neutrino magnetic moment involving the first family, electron anti-neutrinos are indirectly produced through the mixing between first and third families and non-vanishing \mu_{\mu\tau}.
• Using KamLAND limits on the solar flux of electron anti-neutrino, we set the limit \mu_{\mu\tau} < 0.5e-11 Bohr magneton for a reasonable assumption on the behavior of solar magnetic fields.