Author:
Xia Chen,Xu Yan-Hao,Zhou Yu-Feng
Abstract
Abstract
Light sub-GeV halo dark matter (DM) particles up-scattered
by high-energy cosmic-rays (CRs) (referred to as CRDM) can be
energetic and become detectable by conventional DM direct detection
experiments. We perform a refined analysis on the exclusion bounds
of the spin-independent DM-nucleon scattering cross section
σχ p in this approach. For the exclusion lower bounds,
we determine the parameter of the effective distance Deff
for CRDM production using spatial-dependent CR fluxes and including
the contributions from the major heavy CR nuclear species. We obtain
Deff≃ 9 kpc for CRDM particles with kinetic energy
above ∼ 1 GeV, which pushes the corresponding exclusion
lower bounds down to σχ p∼ 4×
10-32 cm2 for DM particle mass at MeV scale and below.
For the exclusion upper bounds from Earth attenuation, previous
estimations neglecting the nuclear form factor leaded to typical
exclusion upper bounds of σχ
p∼𝒪(10-28) cm2 from the XENON1T
data. Using both the analytic and numerical approaches, we show that
for CRDM particles, the presence of the nuclear form factor strongly
suppresses the effect of Earth attenuation. Consequently, the cross
section that can be excluded by the XENON1T data can be a few orders
of magnitude higher, which closes the gap in the cross sections
excluded by the XENON1T experiment and that by the astrophysical
measurements such that for the cosmic microwave background (CMB),
galactic gas cloud cooling, and structure formation, etc..
Subject
Astronomy and Astrophysics
Cited by
29 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献