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arXiv · 2607.12691

Signatures of $X_{17}$ through Coherent Elastic Solar Neutrino-Nucleus Scattering in Direct Detection Searches

M. F. Mustamin·M. Demirci·M. Deniz
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Abstract

The $X_{17}$ particle has been proposed to explain the invariant mass anomalies observed in electron-positron pairs during nuclear transitions at the Atomki experiment. Motivated by recent observations of $^8$B solar neutrinos induced coherent elastic neutrino-nucleus scattering (CE$ν$NS), we present the first comprehensive analysis of the hypothetical boson using data from multi-ton dark matter direct detection facilities. We consider the new particle as a light $Z'$ mediator arising from a spontaneously broken $U(1)'$ symmetry, featuring both vector and axial-vector couplings to leptons. By evaluating the latest datasets from XENONnT, PandaX-4T, and LUX-ZEPLIN, we derive stringent limits on the effective vector coupling utilizing marginalization procedures. Our global analysis provides competitive constraints that meaningfully narrow the allowed parameter space of the model, while exhibiting a clear sensitivity to the tau-flavor coupling.

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M. F. Mustamin, M. Demirci, M. Deniz. 2026-07-14. Signatures of $X_{17}$ through Coherent Elastic Solar Neutrino-Nucleus Scattering in Direct Detection Searches. https://arxiv.org/abs/2607.12691

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