Dark matter bound state formation in fermionic Z2 DM model with light dark photon and dark Higgs boson

Journal of High Energy Physics

Toshinori Matsui¹  Pyungwon Ko²  Yi-Lei Tang³ 

[1] School of Physics, KIAS, 85 Hoegiro, 02455, Seoul, Republic of Korea;Department of Physics, KAIST, 291 Daehakro, 34141, Daejeon, Republic of Korea;School of Physics, KIAS, 85 Hoegiro, 02455, Seoul, Republic of Korea;Quantum Universe Center, KIAS, 85 Hoegiro, 02455, Seoul, Republic of Korea;School of Physics, Sun Yat-Sen University, No. 135 Xingang Xi Road, 510275, Guangzhou, China;Quantum Universe Center, KIAS, 85 Hoegiro, 02455, Seoul, Republic of Korea;

关键词: Beyond Standard Model;    Cosmology of Theories beyond the SM;    Effective Field Theories;    Discrete Symmetries;   

DOI  :  10.1007/JHEP10(2020)082

来源: Springer

【 摘 要 】

If fermionic dark matter (DM) is stabilized by dark U(1) gauge symmetry that is spontaneously broken into its subgroup Z2, the particle contents of the model becomes very rich: DM and excited DM, both of them are Majorana fermions, as well as two dark force mediators, dark photon and dark Higgs boson are naturally present due to the underlying dark gauge symmetry. In this paper, we study the DM bound state formation processes within this scenario, assuming both dark photon and dark Higgs are light mediators and including the effects of excited DM. The Goldstone boson contributions to the potential matrix in the Schrödinger equations are found to be important. The emissions of a longitudinal vector boson (or somehow equivalently a Goldstone boson) during the DM bound state formations are crucial to induce a significant reannihilation process, reducing the dark matter relic abundance. Most of the stringent constraints for this kind of dark matter considered in the literature are simply evaded.

【 授权许可】

CC BY