Speaker
Description
Neutrinos are produced in large quantities in core-collapse supernovae. However, to this date, the observation of supernovae through neutrino detection has been limited to a single event, SN1987A. Another possibility for studying supernova neutrinos is through the detection of the Diffuse Supernova Neutrino Background (DSNB), which represents the collective flux of neutrinos emitted by all past supernovae in the universe.
Supernova neutrinos can be used to explore new physics. In particular, one can investigate the effect of neutrino decay, both in vacuum and in matter, through the detection of these neutrinos. In my talk, I will present bounds extracted from SN1987A data on the lifetime-to-mass ratio of neutrinos when considering neutrino decay in vacuum [1]. Furthermore, new limits using SN1987A data on the couplings of neutrinos with Majorons will be shown [2]. These interactions are responsible for neutrino decay inside the supernova. Finally, I will present the potential to extract information on the neutrino lifetime from future observations of the DSNB flux detection at the running Super-Kamiokande + Gd and the upcoming Hyper-Kamiokande, JUNO, and DUNE experiments [3]. Indeed, the DSNB flux has a unique sensitivity to neutrino non-radiative decay in vacuum for $\tau/m \in [10^9, 10^{11}]$ eV/s.
[1] P. Iváñez-Ballesteros and M. C. Volpe, Phys. Lett. B, 847 (2023) 138252, arXiv:2307.03549
[2] P. Iváñez-Ballesteros and M. C. Volpe, arXiv:2410.11517
[3] P. Iváñez-Ballesteros and M. C. Volpe, Phys. Rev. D, 107 023017, arXiv:2209.12465
