Speaker
Description
We investigate constraints on a hypothetical light gauge boson, $Z'$, using recent CE$\nu\mathcal{N}$S measurements from the CONUS+ reactor experiment. The presence of such a $Z'$ would induce additional neutrino-quark interactions beyond the Standard Model. To explore this possibility, we perform both a $\chi^2$ minimization and a binned Poisson likelihood analysis. Systematic uncertainties arising from the reactor flux, background contributions, and detector efficiency are incorporated as nuisance parameters with Gaussian priors. From this procedure, we derive 90\% C.L. exclusion regions in the $(M_{Z'}, g_{Z'})$ parameter space for representative benchmark scenarios. The resulting bounds are especially stringent for light mediators with masses of a few MeV, providing complementary constraints to those obtained from other CE$\nu\mathcal{N}$S and neutrino experiments.
