Observation of the decays $B^{+} \to \Sigma_{c}(2455)^{++} \bar{\Xi}_{c}^{\prime-}$ and $B^{0} \to \Sigma_{c}(2455)^{0} \bar{\Xi}_{c}^{\prime0}$

Sumitted to PubDB: 2026-01-08

Category: Physics / performance paper

Principal Authors	Yang Li, Chengping Shen
Date	2026-09-30
Working group	B Hadronic
Belle II Number	BELLE2-PUB-PH-2026-001
Abstract	We report the first observation of the decays $B^{+} \to \Sigma_{c}(2455)^{++} \bar{\Xi}_{c}^{\prime-}$ and $B^{0} \to \Sigma_{c}(2455)^{0} \bar{\Xi}_{c}^{\prime0}$ with significances of $6.4\sigma$ and $5.3\sigma$, respectively, including statistical and systematic uncertainties. This analysis is based on data samples containing $771.6 \times 10^{6}$ and $520.6 \times 10^{6}$ $\Upsilon(4S)$ decays collected with the Belle detector at the KEKB collider and the Belle~II detector at the SuperKEKB collider. The branching fractions are measured to be $\mathcal{B}(B^+ \to \Sigma_c(2455)^{++} \bar{\Xi}_c^{\prime -}) = (1.68 \pm 0.31 \pm 0.12^{+1.49}_{-0.54}) \times 10^{-3}$ and $\mathcal{B}(B^0 \to \Sigma_c(2455)^{0} \bar{\Xi}_c^{\prime 0}) = (1.28 \pm 0.32 \pm 0.10^{+0.30}_{-0.21}) \times 10^{-3}$, where the first and second uncertainties are statistical and systematic, respectively, and the third arise from the uncertainties in the absolute branching fractions of $\bar{\Xi}_{c}^{-}$ and $\bar{\Xi}_{c}^{0}$ decays. This result represents the first observation of $B$-meson decays into a pair of charmed baryon--antibaryon states, each belonging to the $SU(3)$ flavor sextet.
Link to LaTeX code	https://gitlab.desy.de/belle2/documents/BELLE2-PUB-PH-2026-001
ArXiv	https://arxiv.org/abs/2606.12905
Journal	Phys.Rev.D
Preprint Number	2026-011