WIMP cogenesis for asymmetric dark matter and the baryon asymmetry

• Published in: The journal of high energy physics 2020-12, Vol.2020 (12), p.1-30, Article 46
• Main Authors: Cui, Yanou, Shamma, Michael
• Format: Article
• Language: English
• Subjects: ASTRONOMY AND ASTROPHYSICS; Asymmetry; Baryons; Beyond Standard Model; Classical and Quantum Gravitation; Cosmology of Theories beyond the SM; Dark matter; Elementary Particles; High energy physics; Large Hadron Collider; Leptons; Particle decay; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Quarks; Regular Article - Theoretical Physics; Relativity Theory; Signatures; Standard model (particle physics); String Theory; Weakly interacting massive particles
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP12(2020)046

A bstract 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.