科研之友
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摘要
We investigate a simplified model of dark matter where a Majorana fermion chi coannihilates with a colored scalar top partner (t) over tilde. We explore the cosmological history, with particular emphasis on the most relevant low- energy parameters: the mass splitting between the dark matter and the coannihilator, and the Yukawa coupling y(chi) that connects these fields to the Standard Model top quarks. We also allow a free quartic coupling lambda(h) between a pair of Higgs bosons and (t) over tilde pairs. We pay special attention to the case where the values take on those expected where (t) over tilde corresponds to the superpartner of the right-handed top, and chi is a bino. Direct detection, indirect detection, and colliders are complementary probes of this simple model.
- 出版日期2015-5-22
