Decoherence in supernova neutrino transformations suppressed by deleptonization

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dc.creatorEsteban-Pretel, Andreu
dc.creatorPastor, Sergio
dc.creatorTomas, Ricard
dc.creatorRaffelt, Georg G.
dc.creatorSigl, Gunter
dc.date2007-06-18
dc.date2007-12-28
dc.date.accessioned2026-07-07T11:16:56Z
dc.date.available2026-07-07T11:16:56Z
dc.descriptionIn the dense-neutrino region at 50-400 km above the neutrino sphere in a supernova, neutrino-neutrino interactions cause large flavor transformations. We study when the multi-angle nature of the neutrino trajectories leads to flavor decoherence between different angular modes. We consider a two-flavor mixing scenario between nu_e and another flavor nu_x and assume the usual hierarchy F(nu_e)>F{antinu_e)>F(nu_x)=F(antinu_x) for the number fluxes. We define epsilon=(F(nu_e)-F(antinu_e))/(F(antinu_e)-F(antinu_x)) as a measure for the deleptonization flux which is the one crucial parameter. The transition between the quasi single-angle behavior and multi-angle decoherence is abrupt as a function of epsilon. For typical choices of other parameters, multi-angle decoherence is suppressed for epsilon>0.3, but a much smaller asymmetry suffices if the neutrino mass hierarchy is normal and the mixing angle small. The critical epsilon depends logarithmically on the neutrino luminosity. In a realistic supernova scenario, the deleptonization flux is probably enough to suppress multi-angle decoherence.
dc.description17 pages, 12 figures. Misprint in Eq (14) corrected
dc.identifierhttps://arxiv.org/abs/0706.2498
dc.identifierhttp://arxiv.org/abs/0706.2498
dc.identifierPhys.Rev.D76:125018,2007
dc.identifierdoi:10.1103/PhysRevD.76.125018
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/192843
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Phenomenology
dc.titleDecoherence in supernova neutrino transformations suppressed by deleptonization
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