Constraints on sub-GeV dark matter boosted by cosmic rays from the CDEX-10 experiment at the China Jinping Underground Laboratory

TL;DR

This paper establishes new constraints on sub-GeV dark matter particles boosted by cosmic rays, utilizing data from the CDEX-10 experiment and advanced simulations to account for Earth shielding effects and cosmic ray contributions.

Contribution

The study introduces a comprehensive analysis of cosmic ray boosted dark matter constraints, including heavier cosmic ray nuclei, inhomogeneous cosmic ray distribution, and Earth attenuation effects.

Findings

Excluded dark matter--nucleon cross-section from 1.7×10⁻³⁰ to 10⁻²⁶ cm² for 10 keV/c² to 1 GeV/c² mass.

Utilized 205.4 kg day data from CDEX-10 at China Jinping Underground Laboratory.

Implemented Monte Carlo simulations with CJPL_ESS for Earth shielding evaluation.

Abstract

We present new constraints on light dark matter boosted by cosmic rays (CRDM) using the 205.4 kg day data of the CDEX-10 experiment conducted at the China Jinping Underground Laboratory. The Monte Carlo simulation package CJPL\_ESS was employed to evaluate the Earth shielding effect. Several key factors have been introduced and discussed in our CRDM analysis, including the contributions from heavier CR nuclei than proton and helium, the inhomogeneity of CR distribution, and the impact of the form factor in the Earth attenuation calculation. Our result excludes the dark matter--nucleon elastic scattering cross-section region from $1.7\times 10^{-30}$ to $10^{-26}~\rm cm^2$ for dark matter of 10 keV$/c^2$ to 1 GeV$/c^2$.