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A new dark sector antibaryon, denoted ψD, could be produced in decays of B mesons. This Letter presents a search for B+ψD+p (and the charge conjugate) decays in e+e annihilations at 10.58 GeV, using data collected in the BABAR experiment. Data corresponding to an integrated luminosity of 398 fb−1 are analyzed. No evidence for a signal is observed. Branching fraction upper limits in the range from 10−7–10−5 are obtained at 90% confidence level for masses of 1.0<D< 4.3 GeV/c2. The result is also reinterpreted to provide the first limits on a supersymmetric model with R-parity violation and a light neutralino.

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Lees, J. P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., Brown, D. N., Kolomensky, Yu. G., Fritsch, M., Koch, H., Cheaib, R., Hearty, C., Mattison, T. S., McKenna, J. A., So, R. Y., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., Kozyrev, E. A., … Wu, S. L. (2023). Search for evidence of baryogenesis and dark matter in . Physical Review Letters, 131(20).

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