Date
January 10 (Fri) at 14:00 - 15:15, 2025 (JST)
Speaker
  • Kensuke Akita (JSPS Research Fellow, Graduate School of Science, The University of Tokyo)
Language
English
Host
Shigehiro Nagataki

Light hypothetical particles with masses up to O(100) MeV can be produced in the core of supernovae. Their subsequent decays to neutrinos can produce a flux component with higher energies than the standard flux. We study the impact of heavy neutral leptons, Z′ bosons, in particular U(1)Lμ−Lτ and U(1)B−L gauge bosons, and majorons coupled to neutrinos flavor-dependently. We obtain new strong limits on these particles from no events of high-energy SN 1987A neutrinos and their future sensitivities from observations of galactic supernova neutrinos.

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