We consider the possible production of a new MeV-scale fermion at the COHERENT experiment. The new fermion, belonging to a dark sector, can be produced through the up-scattering process of neutrinos off the nuclei and the electrons of the detector material, via the exchange of a light vector or scalar mediator. We perform a detailed statistical analysis of the combined COHERENT CsI and LAr data sets and obtain up-to-date constraints on the couplings and masses of the dark fermion and mediators. We finally briefly comment about the stability of the dark fermion.
@article{arxiv.2305.03341,
title = {COHERENT production of a dark fermion},
author = {Pablo M. Candela and Valentina De Romeri and Dimitrios K. Papoulias},
journal= {arXiv preprint arXiv:2305.03341},
year = {2023}
}