| Thème(s) : |
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| Titre : |
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Decoherence in supernova neutrino transformations suppressed by deleptonization |
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| Auteur : |
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A. Esteban-Pretel, S. Pastor, R. Tomas, G.G. Raffelt, G. Sigl1, 2 |
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| Laboratoire : |
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| équipe(s) de recherche : |
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APC - THEORIE |
| Résumé : |
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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 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. |
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| Type de publication : |
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Articles dans des revues avec comité de lecture |
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Date de publication
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12/2007 |
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| Nom du périodique : |
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| Physical Review D (Phys. Rev. D) |
| Publisher |
American Physical Society |
| ISSN |
1550-7998 (eISSN : 1550-2368) |
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| Volume : |
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76 |
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| Page/Article : |
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125018 |
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| Identifiant local : |
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APC-07-51 |
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| Commentaire : |
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16 pages, 12 figures |
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| Mot(s)-clé(s) : |
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Astrophysics – High Energy Physics – Phenomenology |
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