Constraints on light singlet fermion interactions from coherent elastic neutrino-nucleus scattering

Abstract

The exotic singlet fermions $\chi$, with a mass $m_{\chi }\lesssim 50$ MeV, could be produced at the coherent elastic neutrino-nucleus scattering (CE$\nu$NS) experiments through the $\nu \mathcal{N}\to \chi \mathcal{N}$ process. Due to the coherent enhancement, it offers a unique way to study how $\chi$ interacts with the Standard Model (SM) sector. Based on the most general dimension-6 effective Lagrangian, we perform a comprehensive study on the relevant interaction between $\chi$ and the SM sector. From the current and future COHERENT and future CONUS experiments, we obtain the upper bounds on the Wilson coefficients for the dipole, scalar, vector, and tensor interactions. For $m_{\chi }$ below 10 MeV, future CONUS data has the best sensitivity, while for $m_{\chi }$ between 10 MeV$-50$ MeV, the current and future COHERENT bounds dominate. These limits are complementary to those from neutrino oscillation and collider searches. Moreover, the bounds do not depend on the charge conjugation property of $\chi$, nor whether $\chi$ is dark matter or not.

23 pages, 4 figures, References added. To match the published version

References in corpus (5)

• Observation of Coherent Elastic Neutrino-Nucleus Scattering
• Impact of form factor uncertainties on interpretations of coherent elastic neutrino-nucleus scattering data
• Nonstandard neutrino interactions at COHERENT, DUNE, T2HK and LHC
• Probing new neutral gauge bosons with CEvNS and neutrino-electron scattering
• Coherent Elastic Neutrino-Nucleus Scattering with directional detectors

Cited by in corpus (20)

• Novel constraints on neutrino physics beyond the standard model from the CONUS experiment
• Flavor-dependent radiative corrections in coherent elastic neutrino-nucleus scattering
• A Statistical Analysis of the COHERENT Data and Applications to New Physics
• Absorption of Sub-MeV Fermionic Dark Matter by Electron Targets
• Consequences of the Dresden-II reactor data for the weak mixing angle and new physics
• Constraints on general neutrino interactions with exotic fermion from neutrino-electron scattering experiments
• Implications of the first CONUS+ measurement of coherent elastic neutrino-nucleus scattering
• Energy-Dependent Neutrino Mixing Parameters at Oscillation Experiments
• COHERENT production of a dark fermion
• Probing conventional and new physics at the ESS with coherent elastic neutrino-nucleus scattering
• Up-scattering production of a sterile fermion at DUNE: complementarity with spallation source and direct detection experiments
• Light vector bosons and the weak mixing angle in the light of future germanium-based reactor CE$\nu$NS experiments
• A neutrino window to scalar leptoquarks: from low energy to colliders
• Loop effect with vector mediator in the coherent neutrino-nucleus scattering
• Constraining Non-minimal Dark Sector Scenarios with the COHERENT Neutrino Scattering Data
• Loop effect in the coherent neutrino-nucleus scattering
• Nonperturbative effects in neutrino magnetic moments
• Tensor interaction in coherent elastic neutrino-nucleus scattering
• Phenomenology of Dirac neutrino EFTs up to dimension six
• Probing neutrino-night-quark effective scalar interactions from neutrino masses