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arXiv · 0708.3337

Sterile neutrino signals from supernovae

P. Keränen·J. Maalampi·M. Myyryläinen·J. Riittinen
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Abstract

We investigate the effects of a mixing of active and sterile neutrinos on the ratios of supernova electron neutrino flux ($F_e$) and antineutrino flux ($F_{\bar e}$) to the total flux of the other neutrino and antineutrino flavours ($F_a$). We assume that the heaviest (in the normal hierarchy) Standard Model neutrino $ν_3$ mixes with a sterile neutrino resulting in a pair of mass eigenstates with a small mass gap. Using the density matrix formalism we solve numerically the the evolution of neutrino states in the envelope of a supernova and determine the flux ratios $F_e/F_a$ and $F_{\bar{e}}/F_a$ as a function of the active-sterile mixing angle and for the experimentally allowed range of the standard active-active mixing angle $θ_{13}$.

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P. Keränen, J. Maalampi, M. Myyryläinen, J. Riittinen. 2007-11-22. Sterile neutrino signals from supernovae. https://doi.org/10.1103/physrevd.76.125026

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