A study on vector mediator top-philic dark matter  

作　　者：Yanyan Hu Yandong Liu Yuanyuan Liu 

机构地区：[1]College of Nuclear Science and Technology,Beijing Normal University,Joint Laboratory of Jinping Ultra-low Radiation Background Measurement of Ministry of Ecology and Environment,Jinping Deep Underground Frontier Science and Dark Matter Key Laboratory of Sichuan Province,Key Laboratory of Beam Technology of Ministry of Education,Beijing 100875,China [2]Beijing Radiation Center,Beijing 100875,China

出　　处：《Communications in Theoretical Physics》2024年第8期67-78,共12页理论物理通讯（英文版）

基　　金：supported in part by the National Science Foundation of China under Grant Nos. 12222502 and 12075257。

摘　　要：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 threebody process(χχ→tbW-)and the one-loop process(χχ→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.

关 键 词：dark matter new physics effective field theory 

分 类 号：O572.2[理学—粒子物理与原子核物理]