Probing a low-mass $Z^{\prime }$ gauge boson at IceCube and prospects for IceCube-Gen2

Abstract

In this work, we investigate the impact of the $L_{\mu }-L_{\tau }$ model, which predicts a new massive gauge boson, $Z^{\prime }$, on astrophysical neutrino events at the IceCube Observatory. This new gauge boson couples with leptons from the second and third families, and would break the power law of the astrophysical neutrino flux due to the interaction of this flux with the cosmic neutrino background. We derive the sensitivity of the IceCube to this model considering the HESE data from 12 years of observation by assuming different assumptions for the redshift distributions of astrophysical neutrino sources, mass ordering, and sum of neutrino masses. Our results indicate that the current IceCube data is able to probe small coupling and masses of the order of some few MeV, with the covered parameter space being larger if a distribution of neutrino sources is described by the star formation rate model. In addition, we demonstrate that the IceCube-Gen2 will cover a large region of the parameter space and will allow us to improve our understanding of the $L_{\mu }-L_{\tau }$ model.

arXiv comment11 pages, 6 figures, 1 table. Accepted for publication in Physical Review D

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