Speaker
Description
Gauged $U(1)'_{L_\alpha-L_\beta}$ ($\alpha,\beta = e,\mu$ or $e, \tau$ or $\mu, \tau$) extension of the Standard Model results in a new $Z'$ boson, which, if ultra-light, mediates long but finite-range flavor-dependent neutrino-matter interactions. In $U(1)'_{L_e-L_\beta}$ ($\beta = \mu, \tau$) models, neutrinos interact with matter (electrons) directly via $Z'$ boson; however, in $U(1)'_{L_\mu-L_\tau}$ model, the interaction between neutrinos and ample matter (neutrons) is achieved through $Z-Z'_{\mu \tau}$ mixing. Such long-range interactions (LRIs) can hinder the neutrino oscillations, manifestations of which may be seen as the change in flavor composition of diffused astrophysical neutrino flux observed at the Earth. Considering major repositories of matter in the Universe, we constrain LRIs using projected measurements of neutrino flavor composition at the current and the future neutrino telescopes, assisted by the existing and projected measurements of mixing parameters by the present and next-generation neutrino oscillation experiments. In all three models, the constraints on the LRI potential by the 2040 IceCube-Gen2 projections is at-least $\sim 1/3$ times better than those by the 2020 IceCube estimates. Our estimates for 2040 by the IceCube-Gen2 experiment dominate over those from other planned experiments --Baikal-GVD, KM3NeT, P-ONE, and TAMBO.
| Submitted on behalf of a Collaboration? | No |
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