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Density profiles of supernova matter and determination of neutrino parameters

Shao-Hsuan Chiu*

  • Physics Group, C.G.E., Chang Gung University, Kwei-Shan 333, Taiwan

  • *schiu@mail.cgu.edu.tw
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Phys. Rev. D 76, 045004 – Published 10 August, 2007

DOI: https://doi.org/10.1103/PhysRevD.76.045004

Abstract

The flavor conversion of supernova neutrinos can lead to observable signatures related to the unknown neutrino parameters. As one of the determinants in dictating the efficiency of resonant flavor conversion, the local density profile near the Mikheyev-Smirnov-Wolfenstein (MSW) resonance in a supernova environment is, however, not so well understood. In this analysis, variable power-law functions are adopted to represent the independent local density profiles near the locations of resonance. It is shown that the uncertain matter density profile in a supernova, the possible neutrino mass hierarchies, and the undetermined 1-3 mixing angle would result in six distinct scenarios in terms of the survival probabilities of νe and ν¯e. The feasibility of probing the undetermined neutrino mass hierarchy and the 1-3 mixing angle with the supernova neutrinos is then examined using several proposed experimental observables. Given the incomplete knowledge of the supernova matter profile, the analysis is further expanded to incorporate the Earth matter effect. The possible impact due to the choice of models, which differ in the average energy and in the luminosity of neutrinos, is also addressed in the analysis.

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Phys. Rev. D 76, 045004– Published 10 August, 2007
  • Received 25 December 2006

© 2007 American Physical Society

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