Effective neutrino magnetic moments are experiment-dependent; using solar neutrino data from dark matter detectors, the authors derive new bounds on the fundamental Majorana transition moments and translate them into benchmarks for reactor and accelerator experiments.
Neutrino magnetic moments, flavor mixing, and the SuperKamiokande solar data
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abstract
We find that magnetic neutrino-electron scattering is unaffected by oscillations for vacuum mixing of Dirac neutrinos with only diagonal moments and for Majorana neutrinos with two flavors. For MSW mixing, these cases again obtain, though the effective moments can depend on the neutrino energy. Thus, e.g., the magnetic moments measured with $\bar{\nu}_e$ from a reactor and $\nu_e$ from the Sun could be different. With minimal assumptions, we find a new limit on $\mu_{\nu}$ using the 825-days SuperKamiokande solar neutrino data: $|\mu_{\nu}| \le 1.5\times 10^{-10} \mu_B$ at 90% CL, comparable to the existing reactor limit.
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Neutrino magnetic moments: effective versus fundamental parameters
Effective neutrino magnetic moments are experiment-dependent; using solar neutrino data from dark matter detectors, the authors derive new bounds on the fundamental Majorana transition moments and translate them into benchmarks for reactor and accelerator experiments.