Constraints on general neutrino interactions with exotic fermion from neutrino-electron scattering experiments

Abstract

The couplings between the neutrinos and exotic fermion can be probed in both neutrino scattering experiments and dark matter direct detection experiments. We present a detailed analysis of the general neutrino interactions with an exotic fermion and electrons at neutrino-electron scattering experiments. We obtain the constraints on the coupling coefficients of the scalar, pseudoscalar, vector, axialvector, tensor and electromagnetic dipole interactions from the CHARM-II, TEXONO and Borexino experiments. For the flavor-universal interactions, we find that the Borexino experiment sets the strongest bounds in the low mass region for the electromagnetic dipole interactions, and the CHARM-II experiment dominates the bounds for other scenarios. If the interactions are flavor dependent, the bounds from the CHARM-II or TEXONO experiment can be avoided, and there are correlations between the flavored coupling coefficients for the Borexino experiment. We also discuss the detection of sub-MeV DM absorbed by bound electron targets and illustrate that the vector coefficients preferred by XENON1T data is allowed by the neutrino experiments.

18 pages, 5 figures, 1 table. Version published in JHEP

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• Probing Light Mediators in the Radiative Emission of Neutrino Pair
• Constraining super-light sterile neutrinos at Borexino and KamLAND
• Probing conventional and new physics at the ESS with coherent elastic neutrino-nucleus scattering
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• New Interference Effects from Light Gauge Bosons in Neutrino-Electron Scattering