When backgrounds become signals: neutrino interactions in xenon-based dark matter detectors

Abstract

Direct detection dark matter experiments have proven to be compelling probes for studying low-energy neutrino interactions with both nuclei and atomic electrons, offering complementary information to accelerator and reactor-based neutrino experiments. Recently, the XENONnT and PandaX-4T collaborations reported the first evidence of coherent elastic neutrino-nucleus scattering from ${}^8\mathrm{B}$ solar neutrinos. Thanks to their excellent background rejection capabilities and distinctive signal signatures, dual-phase time projection chambers are also sensitive to $pp$ solar neutrinos via their elastic scattering off atomic electrons in the target material. Although this signal is subdominant within the Standard Model, it becomes significantly enhanced in many beyond the Standard Model scenarios, offering a unique opportunity to probe new physics in the low-energy regime. In this work, we analyze the latest electron recoil and nuclear recoil data from XENONnT, PandaX-4T, and LUX-ZEPLIN to probe Standard Model and Beyond the Standard Model physics. While the precision of current neutrino measurements from such detectors remains lower than that achieved by dedicated neutrino experiments, their sensitivity to the tau neutrino component of solar neutrinos helps complete the overall picture, especially when investigating flavor-dependent new physics effects.

18 pages, 5 figures. Matches the published version

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