Mu-tau neutrino refraction and collective three-flavour transformations in supernovae

Details Mu-tau neutrino refraction and collective three-flavour transformations in supernovae Mu-tau neutrino refraction and collective three-flavour transformations in supernovae

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jphcs.136d2076p&link_type=abstract

Journal of Physics: Conference Series, Volume 136, Issue 4, pp. 042076 (2008).

Physics

1

Scientific paper

We study three-flavour collective neutrino transformations in the dense-neutrino region above the neutrino sphere of a supernova core. We find that two-flavour conversions driven by the atmospheric mass difference and the 13-mixing angle capture the full effect if one neglects the second-order difference between the muon and tau neutrino refractive index. Including this 'mu-tau matter term' provides a resonance at a approximate density of 3 x 107 g cm-3 that typically causes significant modifications of the overall electron neutrino and antineutrino survival probabilities. This effect is surprisingly sensitive to deviations from maximal 23-mixing, being different for each octant. Our study has been published in [1], while a more recent discussion of the effect of very dense matter on self-induced flavour neutrino transformations can be found in [2].

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