Abstract
The XENON1T collaboration recently reported an excess in electron recoil events in the energy range between 1-7keV. This excess could be understood to originate from the known solar neutrino flux if neutrinos couple to a light vector mediator with strength g_{νN} that kinetically mixes with the photon with strength χ and g_{νN}χ∼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/T^{2} energy dependence of the neutrino-electron scattering cross section. Other signatures include invisible Higgs and Z decays and leptophilic charged Higgses at a few 100GeV. ALPS II will probe part of the viable parameter space.
Highlights
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
A recently publicized search for low-energy electronic recoil events performed with the XENON1T detector yielded some unexpected excess over background that was statistically significant at the level of 3.2σ [1]
Summary
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany (Received 23 June 2020; accepted 9 September 2020; published 12 October 2020). 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. A more conventional origin of the excess would be an unaccounted Tritium background in the detector [1] or a statistical fluctuation Notwithstanding this perception, here we proclaim a new physics explanation of the excess based on a UV-complete neutrino selfinteraction model recently proposed by Berbig, Jana, and Trautner [8]. From Eq (1), it is possible to inelastically up-scatter neutrinos to hidden neutrinos on electrons in the XENON1T detector (see Fig. 1)
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