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Decoherence in supernova neutrino transformations suppressed by deleptonization

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Decoherence in supernova neutrino transformations suppressed by deleptonization

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dc.contributor.author	Esteban Pretel, Andreu
dc.contributor.author	Pastor Carpi, Sergio
dc.contributor.author	Tomàs, Ricard
dc.contributor.author	Raffelt, Georg G.
dc.contributor.author	Sigl, Günter
dc.date.accessioned	2014-09-01T12:26:05Z
dc.date.available	2014-09-01T12:26:05Z
dc.date.issued	2007
dc.identifier.citation	Esteban Pretel, Andreu Pastor Carpi, Sergio Tomàs, Ricard Raffelt, Georg G. Sigl, Günter 2007 Decoherence in supernova neutrino transformations suppressed by deleptonization Physical Review D 76 12 125018-1 125018-16
dc.identifier.uri	http://hdl.handle.net/10550/37474
dc.description.abstract	In 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 nue and another flavor nux and assume the usual hierarchy F(nue)>F{antinue)>F(nux)=F(antinux) for the number fluxes. We define epsilon=(F(nue)-F(antinue))/(F(antinue)-F(antinux)) 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.language.iso	eng
dc.relation.ispartof	Physical Review D, 2007, vol. 76, num. 12, p. 125018-1-125018-16
dc.subject	Física
dc.title	Decoherence in supernova neutrino transformations suppressed by deleptonization
dc.type	journal article	es_ES
dc.date.updated	2014-09-01T12:26:05Z
dc.identifier.doi	10.1103/PhysRevD.76.125018
dc.identifier.idgrec	041307
dc.rights.accessRights	open access	es_ES