Search for Cosmic Ray Electron Boosted Dark Matter with the CDEX-10 Experiment

TL;DR

This paper uses data from the CDEX-10 experiment to set new constraints on cosmic ray electron boosted dark matter, improving sensitivity for low-mass dark matter particles and considering energy-dependent scattering cross sections.

Contribution

It provides the first constraints on CReDM using CDEX-10 data, considering both heavy and light mediators with energy-dependent cross sections, surpassing previous limits in certain mass ranges.

Findings

Exceeds previous SHM limits for DM mass below 0.6 MeV in heavy mediator case.

Achieves best sensitivity among direct detection experiments for 1 keV to 0.5 MeV in light mediator scenario.

Uses GALPROP to model cosmic ray electron spectrum and distribution in the Galaxy.

Abstract

We present new constraints on the cosmic ray electron boosted light dark matter (CReDM) using the 205.4 kg$\cdot$day data of the CDEX-10 experiment located at the China Jinping Underground Laboratory. The cosmic ray electron spectrum and distribution in the Galaxy are generated by the $\tt GALPROP$ code package. In the calculation process of DM-electron scattering process in the Galaxy, we consider the energy-dependency of the DM-electron scattering cross section. The constraints on CReDM are set for both heavy and light mediator scenarios using the CDEX-10 dataset. The result exceeds previous Standard Halo Model (SHM) limits for DM mass lower than 0.6 MeV in heavy mediator case and corresponds to the best sensitivity among all direct detection experiments from 1 keV to 0.5 MeV in the light mediator scenario.