Probing neutrino coupling to a light scalar with coherent neutrino scattering

Abstract

Large neutrino event numbers in future experiments measuring coherent elastic neutrino nucleus scattering allow precision measurements of standard and new physics. We analyze the current and prospective limits of a light scalar particle coupling to neutrinos and quarks, using COHERENT and CONUS as examples. Both lepton number conserving and violating interactions are considered. It is shown that current (future) experiments can probe for scalar masses of a few MeV couplings down to the level of $10^{-4}$ $(10^{-6})$. Scalars with masses around the neutrino energy allow to determine their mass via a characteristic spectrum shape distortion. Our present and future limits are compared with constraints from supernova evolution, Big Bang nucleosynthesis and neutrinoless double beta decay. We also outline UV-complete underlying models that include a light scalar with coupling to quarks for both lepton number violating and conserving coupling to neutrinos.

15 pages, 5 figures, comments welcome

References in corpus (5)

• COHERENT constraints on nonstandard neutrino interactions
• Average CsI neutron density distribution from COHERENT data
• Sensitivity of low energy neutrino experiments to physics beyond the standard model
• Constraints on New Gravitylike Forces in the Nanometer Range
• Constraints on new interactions from neutron scattering experiments

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