Light vector bosons and the weak mixing angle in the light of future germanium-based reactor CE$\nu$NS experiments

Abstract

In this work, the sensitivity of future germanium-based reactor neutrino experiments to the weak mixing angle ${\sin }^2{\theta }_W$, and to the presence of new light vector bosons is investigated. By taking into account key experimental features with their uncertainties and the application of a data-driven and state-of-the-art reactor antineutrino spectrum, the impact of detection threshold and experimental exposure is assessed in detail for an experiment relying on germanium semiconductor detectors. With the established analysis framework, the precision on the Weinberg angle, and capability of probing the parameter space of a universally coupled mediator model, as well as a U(1)${}_{\mathrm{B}-\mathrm{L}}$-symmetric model are quantified. Our investigation finds the next-generation of germanium-based reactor neutrino experiments in good shape to determine the Weinberg angle ${\sin }^2{\theta }_W$ with $<10$ % precision using the low-energetic neutrino channel of CE$\nu$NS. In addition, the current limits on new light vector bosons determined by reactor experiments can be lowered by about an order of magnitude via the combination of both CE$\nu$NS and E$\nu$eS. Consequently, our findings provide strong phenomenological support for future experimental endeavours close to a reactor site.

25 pages, 8 figures; minor title change, figure 6 adapted (improved readability, additional limits), references and discussions added; matches published version

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Cited by in corpus (6)

• Direct observation of coherent elastic antineutrino-nucleus scattering
• Bounds on new neutrino interactions from the first CE$\nu$NS data at direct detection experiments
• Implications of the first CONUS+ measurement of coherent elastic neutrino-nucleus scattering
• Constraining low scale dark hypercharge symmetry at spallation, reactor and Dark Matter direct detection experiments
• Constraints on New Physics with Light Mediators and Generalized Neutrino Interactions via Coherent Elastic Neutrino Nucleus Scattering
• Probing light mediators with recent PandaX-4T low energy electron recoil data