We leverage the CP violation in charged B meson decays to generate the observed baryon asymmetry and dark matter at O(10 MeV) temperatures. We realize this in two scenarios: Bc+ Mesogenesis and B+
Nearby in the stack
Mesogenesis. In the first, CP violating
Bc±
decays to
B±
mesons are followed by decays to dark and Standard Model baryons. In the second, CP violating
B±
decays to lighter charged mesons are accompanied by the latter's decays to dark and Standard Model leptons, which then scatter into the baryon asymmetry.
Bc+
Mesogenesis is actively being probed at Belle and LHCb, while
B+
Mesogenesis can be tested at colliders and sterile neutrino searches.