2–6 Oct 2023
Palacio de la Magdalena
Europe/Madrid timezone

Probing neutrino-antineutrino interactions via light gauge boson production in proto-neutron stars

3 Oct 2023, 09:00
20m
Aula Santo Mouro (Palacio de la Magdalena)

Aula Santo Mouro

Palacio de la Magdalena

CPAN - Red Temática de Astropartículas (RENATA) CPAN - Red Temática de Astropartículas (RENATA)

Speaker

Marina Cermeño Gavilán

Description

In this talk, I will analyse the effect of the resonant production of low-mass vector mediators from neutrino-antineutrino coalescence in the core of proto-neutron stars on the supernova neutrino flux duration. First, I will argue that, in the regime where neutrino-antineutrino interactions via the new vector mediator dominate over the Standard Model neutrino-nucleon scattering, a redistribution of the neutrino energies might take place, making low-energy neutrinos more trapped. Since this only affects 10% of the neutrino population, it cannot be observed in the SN 1987A data, but it could be analysed with future supernova detection data. I will then focus on small gauge couplings, where the decay length of the new gauge boson is larger than the neutrino-nucleon mean free path, but still smaller than the size of proto-neutron star. I will show for the first time that, in this regime, the resonant production of a long-lived vector mediator and its subsequent decay into neutrinos can significantly reduce the duration of the neutrino burst. By using this argument, we rule out new areas of the parameter space of the well-motivated U(1)Lμ-Lτ model. In particular, we extend cooling bounds to higher couplings, probing values of the coupling to 6x10-8.

Authors

David Cerdeño (Institute for Theoretical Physics (IFT-UAM/CSIC)) Marina Cermeño Gavilán Prof. Yasaman Farzan (IPM)

Presentation materials