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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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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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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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