Constraints on the mass of the dark antibaryon using Bd → ΛψDS channel in light cone QCD

According to the B -mesogenesis framework, the baryon asymmetry of the Universe and dark matter can be simultaneously generated through CP-violating B -meson oscillations. In this mechanism, B -mesons decay into a Standard Model baryon and a dark-sector antibaryon, denoted by ψ DS . Within this scenario, we investigate the allowed mass window for ψ DS using Light Cone Sum Rules (LCSR) for B d → Λ ψ DS decay. To include nonperturbative effects, we employ contributions up to twist-6 of the Λ distribution amplitudes in the operator product expansion (OPE). We derive the branching fraction as a function of dark antibaryon mass and, by comparing with the experimental limits by the BaBar and Belle collaborations, determine the mass ranges of ψ DS consistent with the B -mesogenesis mechanism.