Neutrino Dipole Moments and Solar Experiments

TL;DR

This paper explores how solar neutrino experiments can detect neutrino magnetic moments and magnetic field effects, analyzing data from KamLAND and Borexino to constrain these properties and mechanisms.

Contribution

It introduces a combined analysis of solar neutrino data to constrain neutrino magnetic moments and the impact of solar magnetic fields on neutrino flavor conversion.

Findings

Borexino data constrains neutrino magnetic moments.

Solar neutrino experiments show preference for sizable magnetic fields.

Potential to trace solar magnetic field modulation through neutrino observations.

Abstract

First we investigate the possibility of detecting solar antineutrinos with the KamLAND experiment. Then we analyze the first Borexino data release to constrain the neutrino magnetic moment. Finally we investigate the resonant spin flavour conversion of solar neutrinos to sterile ones, a mechanism which is added to the well known LMA one. In this last condition, we show that the data from all solar neutrino experiments except Borexino exhibit a clear preference for a sizable magnetic field. We argue that the solar neutrino experiments are capable of tracing the possible modulation of the solar magnetic field. In this way Borexino alone may play an essential role although experimental redundancy from other experiments will be most important.