文献类型：期刊文献

英文题名：Light dark matter from dark sector decay

作者：Cheng, Yu[1,2,3];Liao, Wei[1]

机构：[1]East China Univ Sci & Technol, Sch Sci, Inst Modern Phys, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, Shanghai 200240, Peoples R China;[3]Shanghai Jiao Tong Univ, Sch Phys & Astron, Shanghai 200240, Peoples R China

年份：2021

卷号：815

外文期刊名：PHYSICS LETTERS B

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000632729200047)】；

基金：This work is supported by National Natural Science Foundation of China (NSFC), grant No. 11875130. YC would like to thank Alexander Pukhov for answering the questions on the packageMicrOmegas.

语种：英文

摘要：We study the possibility that light dark matter can be produced with right relic density by the decay of other dark sector particles. We study this possibility in a model with right-handed neutrinos, a dark sector singlet scalar and a dark sector singlet fermion. The decay of the heavier dark sector singlet scalar gives rise to the lighter dark sector singlet fermion which serves as the dark matter candidate. We show that the right dark matter relic density can be produced by the decay of the dark sector singlet scalar. We find that the mass of the dark sector singlet fermion can be GeV scale or MeV scale and the interaction of the dark sector singlet fermion is very weak. The dark sector singlet scalar can have a mass of GeV-TeV scale and can have weak scale interactions with the Standard Model (SM) particles. So, in this scenario, dark matter has an interaction with the SM much weaker than the weak interaction, but the dark sector still has weak scale interaction with the SM. (c) 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).