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We report the results of the first search for B− decays to the Ξ¯c0Λ¯c− final state using 711 fb−1 of data collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. The results are interpreted in terms of both direct baryon-number-violating B− decay and Ξc0−Ξ¯c0 oscillations which follow the standard model decay B−→Ξc0Λ¯c−. We observe no evidence for baryon number violation and set the 95% confidence-level upper limits on the ratio of baryon-number-violating and standard model branching fractions B(B−→Ξ¯c0Λ¯c−)/B(B−→Ξc0Λ¯c−) to be 2.7% and on the effective angular frequency of mixing ω in Ξc0−Ξ¯c0 oscillations to be 0.76 ps−1 (equivalent to τmix>1.3 ps). Published by the American Physical Society 2024
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