Abstract
We propose a new mechanism where asymmetric dark matter (ADM) and the baryon asymmetry are both generated in the same decay chain of a metastable weakly interacting massive particle (WIMP) after its thermal freezeout. Dark matter and baryons are connected by a generalized baryon number that is conserved, while the DM asymmetry and baryon asymmetry compensate each other. This unified framework addresses the DM-baryon coincidence while inheriting the merit of the conventional WIMP miracle in predicting relic abundances of matter. Examples of renormalizable models realizing this scenario are presented. These models generically predict ADM with sub-GeV to GeV-scale mass that interacts with Standard Model quarks or leptons, thus rendering potential signatures at direct detection experiments sensitive to low mass DM. Other interesting phenomenological predictions are also discussed, including: LHC signatures of new intermediate particles with color or electroweak charge and DM induced nucleon decay; the long-lived WIMP may be within reach of future high energy collider experiments.
Highlights
Collider experiments [2,3,4]
We propose a new mechanism where asymmetric dark matter (ADM) and the baryon asymmetry are both generated in the same decay chain of a metastable weakly interacting massive particle (WIMP) after its thermal freezeout
The mechanism of “Baryogenesis from Metastable WIMPs” [14] was proposed as a alternative where the prediction is robust against model details: the baryon asymmetry is generated by a long-lived WIMP that undergoes CP- and Bviolating decays after the thermal freezeout of the WIMP
Summary
We explore a specific model which directly produces a baryon asymmetry along with ADM via SM B-violating interactions. This section ends with numerical analyses of the parameter space for these types of models
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