Constraints on the mass of the dark antibaryon using B_d→ Λψ_DS channel in light cone QCD

2026/05/13 by M. A. Abri, N. Hajirasouliha, K. Azizi
#hep-ph #hep-ex #hep-lat

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Abstract

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.

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