| Texto completo | |
| Autor(es): |
Esmaili, Arman
;
Peres, O. L. G.
;
Serpico, Pasquale Dario
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Physical Review D; v. 90, n. 3, p. 20-pg., 2014-08-20. |
| Resumo | |
We study the impact of the existence of an eV-mass scale sterile neutrino-with parameters in the ballpark of what is required to fit the laboratory anomalies-on the early time profile of the electron neutrino and antineutrino fluxes associated to a core-collapse supernova (SN). In particular, we focus on the universal feature of neutronization burst expected in the first tens of ms of the signal: Provided that a detector with sufficient sensitivity is available, it is well known that in the three-neutrino framework the detection of the neutronization burst in neutrino channel would signal inverted mass hierarchy. This conclusion is dramatically altered in the presence of a sterile neutrino: We study here, both analytically and numerically, the region in parameter space where this characteristic signal disappears, mimicking normal hierarchy expectations. Conversely, the detection of a peak consistent with expectations for inverted mass hierarchy would exclude the existence of a sterile state over a much wider parameter space than what is required by laboratory anomaly fits, or is even probed by detectors coming on-line in the near future. Additionally, we show the peculiar alteration in the energy-time double differential flux, with a delayed peak appearing for kinematical reasons, which might offer a remarkable signature in the case of favorable parameters and for a high statistics detection of a Galactic SN. We also comment on additional potentially interesting effects in the electron antineutrino channel, if more than one angle in the active-sterile sector is nonvanishing. As an ancillary result that we derived in the technical resolution of the equations, in an Appendix we report the Cayley-Hamilton formalism for the evolution of a four-neutrino system in matter, generalizing existing results in the literature. (AU) | |
| Processo FAPESP: | 09/17924-5 - Fenomenologia de neutrinos em telescópios de neutrinos |
| Beneficiário: | Arman Esmaili Taklimi |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 12/08208-7 - Testando graus de liberdade leves do modelo padrão em astropartículas |
| Beneficiário: | Orlando Luis Goulart Peres |
| Modalidade de apoio: | Auxílio à Pesquisa - Pesquisador Visitante - Internacional |
| Processo FAPESP: | 12/16389-1 - Fenomenologia de neutrinos |
| Beneficiário: | Orlando Luis Goulart Peres |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |