New Freezeout Mechanism for Strongly Interacting Dark Matter.
Phys Rev Lett
; 125(13): 131301, 2020 Sep 25.
Article
in En
| MEDLINE
| ID: mdl-33034501
ABSTRACT
We present a new mechanism for thermally produced dark matter, based on a semi-annihilation-like process, χ+χ+SMâχ+SM, with intriguing consequences for the properties of dark matter. First, its mass is low, â²1 GeV (but â³5 keV to avoid structure-formation constraints). Second, it is strongly interacting, leading to kinetic equilibrium between the dark and visible sectors, avoiding the structure-formation problems of χ+χ+χâχ+χ models. Third, in the 3â2 process, one dark matter particle is consumed, giving the standard-model particle a monoenergetic recoil. We show that this new scenario is presently allowed, which is surprising (perhaps a "minor miracle"). However, it can be systematically tested by novel analyses in present and near-term experiments. In particular, the Co-SIMP model for thermal-relic dark matter can explain the XENON1T excess.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Phys Rev Lett
Year:
2020
Document type:
Article
Affiliation country:
United States