Three-generation flavor transitions and decays of supernova relic neutrinos

Details Three-generation flavor transitions and decays of supernova relic neutrinos Three-generation flavor transitions and decays of supernova relic neutrinos

2004-01-28

arxiv.org/abs/hep-ph/0401227v1

Phys.Rev.D70:013001,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, including 7 figures

Scientific paper

10.1103/PhysRevD.70.013001

If neutrinos have mass, they can also decay. Decay lifetimes of cosmological interest can be probed, in principle, through the detection of the redshifted, diffuse neutrino flux produced by all past supernovae--the so-called supernova relic neutrino (SRN) flux. In this work, we solve the SRN kinetic equations in the general case of three-generation flavor transitions followed by invisible (nonradiative) two-body decays. We then use the general solution to calculate observable SRN spectra in some representative decay scenarios. It is shown that, in the presence of decay, the SRN event rate can basically span the whole range below the current experimental upper bound--a range accessible to future experimental projects. Radiative SRN decays are also briefly discussed.

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