Search for exotic interactions of solar neutrinos in the CDEX-10 experiment

Abstract

We investigate exotic neutrino interactions using the 205.4 kg$\cdot$day dataset from the CDEX-10 experiment at the China Jinping Underground Laboratory. New constraints on the mass and couplings of new gauge bosons are presented. Two nonstandard neutrino interactions are considered: a $U(1{)}_{B-L}$ gauge-boson-induced interaction between an active neutrino and electron/nucleus, and a dark-photon-induced interaction between a sterile neutrino and electron/nucleus via kinetic mixing with a photon. This work probes an unexplored parameter space involving sterile neutrino coupling with a dark photon. New laboratory limits are derived on dark photon masses below $1\mathrm{eV}/c^2$ at some benchmark values of $\Delta m_{41}^2$ and $g^{\prime 2}{\sin }^{2}2{\theta }_{14}$.

arXiv comment6 pages, 4 figures. Version updated to match PRD version

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• Probing light mediators with recent PandaX-4T low energy electron recoil data
• Investigating sub-MeV dark matter annihilation to neutrinos using direct detection experiments