Light vector mediator search in the low-energy data of the CONNIE reactor neutrino experiment
2019
The CONNIE experiment is located at a distance of 30 m from the core of a commercial nuclear reactor, and has collected a 3.7 kg-day exposure using a CCD detector array sensitive to an $\sim$1 keV threshold for the study of coherent neutrino-nucleus elastic scattering. Here, we use the results previously published by the CONNIE collaboration to constrain the allowed region in the parameter space of a Standard Model extension with a light vector mediator. We obtain new world-leading constraints for a light vector mediator with mass $M_{Z^{\prime}}<$ 10 MeV. These results constitute the first use of the CONNIE data as a probe for physics beyond the Standard Model.
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