Regular Article - Theoretical Physics
SN1987A neutrino burst: limits on flavor conversion
Instituto de Física Gleb Wataghin, UNICAMP, Rua Sérgio Buarque de Holanda 777, Campinas, SP, Brazil
2 Niels Bohr International Academy & DARK, Niels Bohr Institute, University of Copenhagen, Blegdamsvej, 17, 2100, Copenhagen, Denmark
Accepted: 7 May 2023
Published online: 2 June 2023
In this paper, we revisit the SN1987A neutrino data to see its constraints on flavor conversion. We are motivated by the fact that most works that analyze this data consider a specific conversion mechanism, such as the MSW (Mikheyev–Smirnov–Wolfenstein) effect, although flavor conversion is still an open question in supernovae due to the presence of neutrino–neutrino interactions. In our analysis, instead of considering a specific conversion mechanism, we let the electron antineutrino survival probability be a free parameter. We fit the data from Kamiokande-II, Baksan, and IMB detected spectrum with two classes of models: time-integrated and time-dependent. For the time-integrated model, it is not possible to put limits above (68% confidence level) on the survival probability. The same happens for the time-dependent model when cooling is the only mechanism of antineutrino emission. However, for models considering an accretion phase, is strongly rejected, showing a preference for the existence of an accretion component in the detected antineutrino flux, and a preference for normal mass ordering when only the MSW is present.
© The Author(s) 2023
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