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Probing Scalar-Neutrino and Scalar-Dark-Matter Interactions with PandaX-4T
1Shanghai Jiao Tong University, SJTU Paris Elite Institute of Technology, Shanghai 200240, China.
Abstract:
Scalar-mediated interactions may exist among neutrinos, dark matter particles, or between the two. Double β-decay experiments provide a powerful tool to probe such exotic interactions. Using ^{136}Xe double β-decay data from PandaX-4T, we perform the first direct spectral search in the energy range of 20 to 2800 keV, setting the most stringent limits to date on scalar-mediated neutrino self-interactions for mediator masses below 2 MeV/c^{2}. These results place significant constraints on models invoking such interactions to alleviate the Hubble tension. Assuming the same scalar also mediates dark matter self-interactions, constraints on the dark matter-scalar interactions can be placed in conjunction with cosmological constraints.
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