Neutrino Self-Interactions and XENON1T Electron Recoil Excess

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Abstract

The XENON1T collaboration recently reported an excess in electron recoil events in the energy range between 1-7 keV. This excess could be understood to originate from the known solar neutrino flux if neutrinos couple to a light vector mediator with strength gνN that kinetically mixes with the photon with strength χ and gνNχ∼10-13. Here, we show that such coupling values can naturally arise in a renormalizable model of long-range vector-mediated neutrino self-interactions. The model could be distinguished from other explanations of the XENON1T excess by the characteristic 1/T2 energy dependence of the neutrino-electron scattering cross section. Other signatures include invisible Higgs and Z decays and leptophilic charged Higgses at a few 100 GeV. ALPS II will probe part of the viable parameter space.

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Bally, A., Jana, S., & Trautner, A. (2020). Neutrino Self-Interactions and XENON1T Electron Recoil Excess. Physical Review Letters, 125(16). https://doi.org/10.1103/PhysRevLett.125.161802

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