Search for Baryon-Number-Violating Processes in B^- Decays to the Ξ_c⁰ Λ_c^- Final State

2024/01/09 by Belle Collaboration, Gu, T., Savinov, V. +161
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2401.04807

Abstract

We report the results of the first search for B^- decays to the Ξ_c⁰ Λ_c^- final state using 711~\rm 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 Ξ_c⁰-Ξ_c⁰ oscillations which follow the Standard Model decay B^- → Ξ_c⁰ Λ_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_c⁰ Λ_c^-)/B(B^- → Ξ_c⁰ Λ_c^-) to be < 2.7% and on the Ξ_c⁰ - Ξ_c⁰ oscillation angular frequency ω to be < 0.76 ps^-1 (equivalent to τ_{\rm mix} > 1.3~ps).

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