We discuss the possibility of cogenesis generating the ratio of baryon asymmetry to dark matter in a Stueckelberg U(1) extension of the standard model and of the minimal supersymmetric standard model. For the U(1) we choose $L_μ-L_τ$ which is anomaly free and can be gauged. The dark matter candidate arising from this extension is a singlet of the standard model gauge group but is charged under $L_μ-L_τ$. Solutions to the Boltzmann equations for relics in the presence of asymmetric dark matter are discussed. It is shown that the ratio of the baryon asymmetry to dark matter consistent with the current WMAP data, i.e., the cosmic coincidence, can be successfully explained in this model with the depletion of the symmetric component of dark matter from resonant annihilation via the Stueckelberg gauge boson. For the extended MSSM model it is shown that one has a two component dark matter picture with asymmetric dark matter being the dominant component and the neutralino being the subdominant component (i.e., with relic density a small fraction of the WMAP cold dark matter value). Remarkably, the subdominant component can be detected in direct detection experiments such as SuperCDMS and XENON-100. Further, it is shown that the class of Stueckelberg models with a gauged $L_μ-L_τ$ will produce a dramatic signature at a muon collider with the $σ(μ^+μ^-\to μ^+μ^-,τ^+τ^-)$ showing a detectable $Z'$ resonance while $σ(μ^+μ^-\to e^+e^-)$ is devoid of this resonance. Asymmetric dark matter arising from a $U(1)_{B-L}$ Stueckelberg extension is also briefly discussed. Finally, in the models we propose the asymmetric dark matter does not oscillate and there is no danger of it being washed out from oscillations.
Neutron Portal and Dark Matter-Baryon Coincidence: from UV Completion to Phenomenology
Center for Theoretical Physics of the Universe, Institute for Basic Science (IBS)（宇宙理论物理中心，基础科学研究院）；Tsung-Dao Lee Institute, Shanghai Jiao Tong University（上海交大东京-李政道研究所）；School of Physics and Astronomy, Shanghai Jiao Tong University（上海交通大学物理与天文学院）；School of Physics, Henan Normal University（河南师范大学物理学院）
Muonphilic asymmetric dark matter at a future muon collider
School of Physics and Astronomy, Monash University（莫纳什大学物理与天文学院）；ARC Centre of Excellence for Dark Matter Particle Physics, School of Physics, The University of Melbourne（墨尔本大学物理学院暗物质粒子物理卓越研究中心）
Heavy Dark Baryons as Self-Interacting Dark Matter: A GeV-Scale Coincidence
ARC Centre of Excellence for Dark Matter Particle Physics, School of Physics, The University of Melbourne（墨尔本大学物理学院暗物质粒子物理卓越中心）；Institut für Astroteilchen Physik, Karlsruher Institut für Technologie (KIT)（卡尔斯鲁厄理工学院天体粒子物理研究所）；Departament de Física Teòrica, Universitat de València（瓦伦西亚大学理论物理系）；Instituto de Física Corpuscular (CSIC-Universitat de València)（粒子物理研究所（瓦伦西亚大学-西班牙国家科学研究委员会））
