Abstract
We conducted a study on a simplified dark matter model that introduces a vector-like intermediate particle,facilitating exclusive interactions between dark matter and the top quark in the Standard Model.The analysis focused on the relic density of Dirac-type fermion dark matter and highlighted the complementary role of direct detection in constraining the dark matter model.Notably,in instances when dark matter mass is small,the tree-level two-body annihilation process experiences suppression.In such scenarios,the contributions of the three-body process(x(x) → t(b)W-)and the one-loop process(x(x)→gg)dominate the relic abundance.With regard to direct detection,calculations were performed for the two-loop contribution to the dark-matter-gluon interaction,yielding the corresponding spin-independent scattering cross section.
基金项目
National Science Foundation of China(12222502)
National Science Foundation of China(12075257)
NETL
NSTL
万方数据