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

TL;DR

This paper searches for exotic neutrino interactions using data from the CDEX-10 experiment, setting new constraints on gauge bosons and dark photons, especially involving sterile neutrinos, in an unexplored parameter space.

Contribution

It provides the first laboratory limits on dark photon masses below 1 eV/c² related to sterile neutrino interactions using direct detection data.

Findings

New constraints on gauge boson masses and couplings.

Limits on dark photon masses below 1 eV/c².

Probing sterile neutrino-dark photon interactions.

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 $1~{\rm eV}/c^{2}$ at some benchmark values of $\Delta m_{41}^{2}$ and $g^{\prime2}{\rm{sin}}^{2}2\theta_{14}$.