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|Paper IPM / P / 15182||
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.
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