Constraints from the duration of supernova neutrino burst on on-shell light gauge boson production by neutrinos

Abstract

In this article, we study the on-shell production of low-mass vector mediators from neutrino-antineutrino coalescence in the core of proto-neutron stars. Taking into account the radial dependence of the density, energy, and temperature inside the proto-neutron star, we compute the neutrino-antineutrino interaction rate in the star interior in the well-motivated $U(1{)}_{L_{\mu }-L_{\tau }}$ model. First, we determine the values of the coupling above which neutrino-antineutrino interactions dominate over the Standard Model neutrino-nucleon scattering. We argue that, although in this regime a redistribution of the neutrino energies might take place, making low-energy neutrinos more trapped, this only affects a small part of the neutrino population and it cannot be constrained with the SN 1987A data. Thus, contrary to previous claims, the region of the parameter space where the $U(1{)}_{L_{\mu }-L_{\tau }}$ model explains the discrepancy in the muon anomalous magnetic moment is not ruled out. We 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. We show that in this regime, the on-shell production of a long-lived $Z^{\prime }$ and its subsequent decay into neutrinos can significantly reduce the duration of the neutrino burst, probing values of the coupling below $\mathcal{O}(10^{-7})$ for mediator masses between 10 and 100 MeV. This disfavours new areas of the parameter space of the $U(1{)}_{L_{\mu }-L_{\tau }}$ model.

arXiv comment21 pages, 5 figures. Minor changes. Final version, published in PRD

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