Constraints on New Physics with Light Mediators and Generalized Neutrino Interactions via Coherent Elastic Neutrino Nucleus Scattering

Abstract: We investigate new physics effects on the framework of Coherent Elastic Neutrino Nucleus Scattering (CE$\nu$NS) from Non-Standard Interactions (NSI) of neutrinos and generalized neutrino interactions (GNI) as well as the possibility of light mediators from simplified model which includes all possible Lorentz-invariant interactions of vector (V), axialvector (A), scalar (S), pseudoscalar (P), and tensor (T) type. The constraints and the allowed regions at $90\%$ C.L. for masses and couplings in each new physics scenario are derived from the analysis of TEXONO data, including two datasets from 2016 with a high purity $n$-type point-contact (nPC) germanium (Ge) detector and from 2024 with an advanced $p$-type point-contact (pPC) Ge detector. The results are presented in comparison with the current data of COHERENT with CsI and LAr detectors to highlight the complementarity of reactor- and accelerator-based neutrino experiments.