Neutrino spin relaxation in medium with stochastic characteristics

Details Neutrino spin relaxation in medium with stochastic characteristics Neutrino spin relaxation in medium with stochastic characteristics

2005-01-09

arxiv.org/abs/hep-ph/0501063v2

Int.J.Mod.Phys. A21 (2006) 2403-2414

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, RevTeX4; 2 references added; more detailed discussion of correlation functions and cosmological neutrinos is presente

Scientific paper

10.1142/S0217751X06028497

The helicity evolution of a neutrino interacting with randomly moving and polarized matter is studied. We derive the equation for the averaged neutrino helicity. The type of the neutrino interaction with background fermions is not fixed. In the particular case of a tau-neutrino interacting with ultrarelativistic electron-positron plasma we obtain the expression for the neutrino helicity relaxation rate in the explicit form. We study the neutrino spin relaxation in the relativistic primordial plasma. Supposing that the conversion of left-handed neutrinos into right-handed ones is suppressed at the early stages of the Universe evolution we get the upper limit on the tau-neutrino mass.

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