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In several extensions of the Standard Model of Particle Physics (SMPP), the neutrinos acquire electromagnetic properties such as the electric millicharge. Many theoretical and experimental constraints have been reported in the literature for this parameter. In this work, we first carried out a statistical analysis by using data from reactor neutrino experiments, which include elastic neutrino-electron scattering (ENES) processes, in order to obtain both individual and combined limits on the neutrino electric millicharge (NEM). Then we performed a similar calculation to show a estimate of the sensitivity of future experiments of reactor neutrinos to the NEM, by involving coherent elastic neutrino-nucleus scattering (CENNS). In the first case, the constraint on NEM achieved from a combination of all experiments studied here is $q_{\nu} \lesssim 1.5\times 10^{-12} e$ ($90\%$ C.L.), which corresponds to the same result previously reported by the GEMMA experiment. However, in the second scenario, the combined bound from different CENNS experimental proposals is $q_{\nu} \lesssim 3.5\times 10^{-13} e$ ($90\%$ C.L.), showing that the CENNS experiments could be a suitable alternative to improve the current limits on NEM.

advances in high energy physics

Constraints on Neutrino Electric Millicharge from Experiments of Elastic Neutrino-Electron Interaction and Future Experimental Proposals Involving Coherent Elastic Neutrino-Nucleus Scattering