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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Impact of sterile neutrinos on the early time flux from a galactic supernova

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Author(s):
Esmaili, Arman [1, 2] ; Peres, O. L. G. [1, 3] ; Serpico, Pasquale Dario [4]
Total Authors: 3
Affiliation:
[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Sao Paulo - Brazil
[2] Seoul Natl Univ Sci & Technol, Inst Convergence Fundamental Studies, Seoul 139743 - South Korea
[3] Abdus Salaam Int Ctr Theoret Phys, Abdus Salam Int Ctr Theoret Phys, I-34010 Trieste - Italy
[4] Univ Savoie, LAPTh, CNRS, F-74941 Annecy Le Vieux - France
Total Affiliations: 4
Document type: Journal article
Source: Physical Review D; v. 90, n. 3 AUG 20 2014.
Web of Science Citations: 20
Abstract

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)

FAPESP's process: 12/16389-1 - Neutrino phenomenology
Grantee:Orlando Luis Goulart Peres
Support type: Regular Research Grants
FAPESP's process: 09/17924-5 - Neutrino phenomenology in neutrino telescopes
Grantee:Arman Esmaili Taklimi
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 12/08208-7 - Astroparticle tests of beyond standard model light degrees of freedom
Grantee:Orlando Luis Goulart Peres
Support type: Research Grants - Visiting Researcher Grant - International