Solar Neutrinos with Magnetic Moment: Rates and Global Analysis

Abstract

A statistical analysis of the solar neutrino data is presented assuming the solar neutrino deficit to be resolved by the resonant interaction of the neutrino magnetic moment with the solar magnetic field. Four field profiles are investigated, all exhibiting a rapid increase across the bottom of the convective zone, one of them closely following the requirements from recent solar physics investigations. First a 'rates only' analysis is performed whose best fits appear to be remarkably better than all fits from oscillations. A global analysis then follows with the corresponding best fits of a comparable quality to the LMA one. Despite the fact that the resonant spin flavour precession does not predict any day/night effect, the separate SuperKamiokande day and night data are included in the analysis in order to allow for a direct comparison with oscillation scenarios. Remarkably enough, the best fit for rates and global analysis which is compatible with most astrophysical bounds on the neutrino magnetic moment is obtained from the profile which most closely follows solar physics requirements. Allowing for a peak field value of $3\times 10^{5}G$, it is found in this case that $\Delta m_{21}^2=1.45\times 10^{-8}e{V}^2$, ${\mu }_{\nu }=3.2\times 10^{-12}{\mu }_B$ (65%CL). The new forthcoming experiments on solar neutrino physics (Kamland and Borexino) will be essential to ascertain whether this fact is incidental or essential.

Latex, 16 pages, 3 figures

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Cited by in corpus (9)

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• LMA and sterile neutrinos: a case for resonance spin flavour precession?
• A new solution to the solar neutrino deficit
• Low Energy Solar Neutrinos and Spin Flavour Precession
• KamLAND, solar antineutrinos and the solar magnetic field
• Resonance Spin Flavour Precession of Solar Neutrinos After SNO NC Data
• KamLAND Bounds on Solar Antineutrinos and neutrino transition magnetic moments
• Light sterile neutrinos, spin flavour precession and the solar neutrino experiments