Loop effect in the coherent neutrino-nucleus scattering

A bstract connection between the neutrino and an exotic fermion is described in general model. In this model neutrinos can convert into new thus interaction leads to novel recoil spectrum scattering experiments. We study by evaluating both tree-level loop-level contributions coherent elastic neutrino-nucleus scattering. illustrate taking framework of a simplified with Dirac ? spin-0 mediator. For CP phase quark sector being 0 ? /2, detection processes are dominated contribution, respectively. investigate constraints on couplings mediator particle or quarks fitting COHERENT data. The parameter space m larger than maximal energy incoming be also constrained including contribution.