New bounds on the neutrino magnetic moment from the plasma induced neutrino chirality flip in a supernova

Details New bounds on the neutrino magnetic moment from the plasma induced neutrino chirality flip in a supernova New bounds on the neutrino magnetic moment from the plasma induced neutrino chirality flip in a supernova

2007-09-02

arxiv.org/abs/0709.0110v1

JCAP 0711:031,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, LaTeX, 7 EPS figures, submitted to Journal of Cosmology and Astroparticle Physics

Scientific paper

10.1088/1475-7516/2007/11/031

The neutrino chirality-flip process under the conditions of the supernova core is investigated in detail with the plasma polarization effects in the photon propagator taken into account, in a more consistent way than in earlier publications. It is shown in part that the contribution of the proton fraction of plasma is essential. New upper bounds on the neutrino magnetic moment are obtained: mu_nu < (0.5 - 1.1) 10^{-12} mu_B from the limit on the supernova core luminosity for nu_R emission, and mu_nu < (0.4 - 0.6) 10^{-12} mu_B from the limit on the averaged time of the neutrino spin-flip. The best upper bound on the neutrino magnetic moment from SN1987A is improved by the factor of 3 to 7.

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