Search for Baryon-Number-Violating Processes in $B^-$ Decays to the $\barΞ_{c}^{0} \barΛ_{c}^{-}$ Final State
KEKB
Bar (unit)
Branching fraction
DOI:
10.48550/arxiv.2401.04807
Publication Date:
2024-01-01
AUTHORS (164)
ABSTRACT
We report the results of first search for $B^-$ decays to $\bar{\Xi}_{c}^{0} \bar{\Lambda}_{c}^{-}$ final state using 711~${\rm fb^{-1}}$ data collected at $\Upsilon(4S)$ resonance with Belle detector KEKB asymmetric-energy $e^+ e^-$ collider. The are interpreted in terms both direct baryon-number-violating decay and $\Xi_{c}^{0}-\bar{\Xi}_{c}^{0}$ oscillations which follow Standard Model $B^- \to \Xi_{c}^{0} \bar{\Lambda}_{c}^{-}$. observe no evidence baryon number violation set 95\% confidence-level upper limits on ratio branching fractions ${\mathcal{B}(B^- \rightarrow \bar{\Xi}_{c}^{0} \bar{\Lambda}_{c}^{-})}/{\mathcal{B}(B^- \bar{\Lambda}_{c}^{-})}$ be $< 2.7\%$ $\Xi_{c}^{0} - \bar{\Xi}_{c}^{0}$ oscillation angular frequency $\omega$ 0.76\ \mathrm{ps}^{-1}$ (equivalent $\tau_{\rm mix} > 1.3$~ps).
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