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.

arXiv comment16 pages, 3 figures. Some clarifications and references added. Accepted for publication in Phys. Rev. D

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• Neutrino electromagnetic properties
• Constraints on Non-Standard Neutrino Interactions and Unparticle Physics with Neutrino-Electron Scattering at the Kuo-Sheng Nuclear Power Reactor
• Constraining New Physics with Borexino Phase-II spectral data
• Neutrino magnetic moment: a window to new physics
• Theoretical Overview of Neutrino Properties
• Vector unparticle enhanced black holes: exact solutions and thermodynamics
• Large Neutrino Magnetic Dipole Moments in MSSM Extensions
• Constraints on Scalar-Pseudoscalar and Tensorial Non-Standard Interaction and Tensorial Unparticle Couplings from Neutrino-Electron Scattering
• ${\sin }^2{\theta }_W$ estimate and neutrino electromagnetic properties from low-energy solar data
• Unparticle physics and neutrino phenomenology
• Light sterile neutrinos, spin flavour precession and the solar neutrino experiments
• Magnetic dipole moment and keV neutrino dark matter
• Neutral Current induced ${\pi }^0$ production and neutrino magnetic moment
• Muon collider probes of Majorana neutrino dipole moments and masses
• Unparticle Self-Interactions at the Large Hadron Collider
• New limits on neutrino magnetic moment through non-vanishing 13-mixing
• Neutrino elastic scattering on polarized electrons as a tool for probing the neutrino nature
• Probing neutrino nature at Borexino detector with chromium neutrino source
• Neutrino-2008: Where are we? Where are we going?
• On possibility of time reversal symmetry violation in neutrino elastic scattering on polarized electron target
• Azimuthal asymmetry of recoil electrons in neutrino-electron elastic scattering as signature of neutrino nature
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• Distinguishing Dirac and Majorana Neutrinos: Resonant Spin-Flavor Precession of GeV-Scale Astrophysical Transients
• Neutrino self-energy with new physics effects in an external magnetic field
• Constraints on neutrino masses coming from magnetic dipole moments in a two Higgs doublet model type I and II