Probing neutrino magnetic moment and unparticle interactions with Borexino

Abstract

We discuss the limits on the neutrino magnetic moment and hypothetical interactions with a hidden unparticle sector, coming from the first neutrino data release of the Borexino experiment. The observed spectrum in Borexino depends weakly on the solar model used in the analysis, since most of the signal comes from the mono-energetic 7Be neutrinos. This fact allows us to calibrate the nu-e scattering cross section through the spectral shape. In this way, we have derived a limit on the magnetic moment for the neutrinos coming from the Sun (in which a nu_mu and nu_tau component is present): mu_nu<8.4E-11 mu_B (90%CL) which is comparable with those obtained from low energy reactor experiments. Moreover, we improve the previous upper limit on magnetic moment of the nu_tau by three orders of magnitude and the limit on the coupling constant of the neutrino with a hidden unparticle sector.

16 pages, 3 figures. Some clarifications and references added. Accepted for publication in Phys. Rev. D

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• Light sterile neutrinos, spin flavour precession and the solar neutrino experiments
• Neutral Current induced ${\pi }^0$ production and neutrino magnetic moment
• Muon collider probes of Majorana neutrino dipole moments and masses
• Neutrino-2008: Where are we? Where are we going?
• Neutrino self-energy with new physics effects in an external magnetic field
• Distinguishing Dirac and Majorana Neutrinos: Resonant Spin-Flavor Precession of GeV-Scale Astrophysical Transients
• Constraints on neutrino masses coming from magnetic dipole moments in a two Higgs doublet model type I and II