Search for the $B^{-} \to \bar{\Sigma}_{c}(2455)^{--}\Xi_{c}^{+}$ and $\bar{B}^{0} \to \bar{\Sigma}_{c}(2455)^{0}\Xi_{c}^{0}$ decays at Belle and Belle II

Sumitted to PubDB: 2025-02-18

Category: Physics / performance paper

Tags: Run 1 Belle

Principal Authors Yang Li, Chengping Shen
Date 2026-01-29
Working group B Hadronic
Belle II Number BELLE2-PUB-PH-2025-009
Abstract We report the first observation of the two-body baryonic decays $B^{+} \to \Sigma_{c}(2455)^{++} \overline{\Xi}_{c}^{-}$ and $B^{0} \to \Sigma_{c}(2455)^{0} \overline{\Xi}_{c}^{0}$ with significances of $7.3\,\sigma$ and $6.2\,\sigma$, respectively, including statistical and systematic uncertainties. The branching fractions are measured to be $\mathcal{B}(B^{+} \to \Sigma_{c}(2455)^{++} \overline{\Xi}_{c}^{-}) = (5.74 \pm 1.11 \pm 0.42_{-1.53}^{+2.47}) \times 10^{-4}$ and $\mathcal{B}(B^{0} \to \Sigma_{c}(2455)^{0} \overline{\Xi}_{c}^{0}) = (4.83 \pm 1.12 \pm 0.37_{-0.60}^{+0.72}) \times 10^{-4}$. The first and second uncertainties are statistical and systematic, respectively, while the third ones arise from the absolute branching fractions of $\overline{\Xi}_{c}^{-}$ or $\overline{\Xi}_{c}^{0}$ decays. The data samples used for this analysis have integrated luminosities of 711~$\mathrm{fb}^{-1}$ and 365~$\mathrm{fb}^{-1}$, and were collected at the $\Upsilon(4S)$ resonance by the Belle and Belle~II detectors operating at the KEKB and SuperKEKB asymmetric-energy $e^{+}e^{-}$ colliders, respectively.
ArXiv https://arxiv.org/abs/2507.05094
Inspire https://inspirehep.net/literature/2967237
DOI 10.1103/2fhj-8vyx
Reference Phys.Rev.D 112, L051101 (2025)
Bibtex 
@article{Belle:2025nup,
    author = "Abumusabh, M. and others",
    collaboration = "Belle, Belle-II",
    title = "{Observation of the decays B+{\textrightarrow}{\ensuremath{\Sigma}}c(2455)++{\ensuremath{\Xi}}{\textasciimacron}c- and B0{\textrightarrow}{\ensuremath{\Sigma}}c(2455)0{\ensuremath{\Xi}}{\textasciimacron}c0}",
    eprint = "2507.05094",
    archivePrefix = "arXiv",
    primaryClass = "hep-ex",
    reportNumber = "Belle II Preprint 2025-019, KEK Preprint 2025-18",
    doi = "10.1103/2fhj-8vyx",
    journal = "Phys. Rev. D",
    volume = "112",
    number = "5",
    pages = "L051101",
    year = "2025"
}
Journal Phys.Rev.D
Preprint Number 2025-019

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