Phys. Rev. D 105, L011102 (2022) - Measurements of the branching fractions of ${\mathrm{\ensuremath{\Xi}}}_{c}^{0}\ensuremath{\rightarrow}\mathrm{\ensuremath{\Lambda}}{K}_{S}^{0}$, ${\mathrm{\ensuremath{\Xi}}}_{c}^{0}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Sigma}}}^{0}{K}_{S}^{0}$, and ${\mathrm{\ensuremath{\Xi}}}_{c}^{0}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Sigma}}}^{+}{K}^{\ensuremath{-}}$ decays at Belle

Letter
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Measurements of the branching fractions of $Ξ_{c}^{0} \to Λ K_{S}^{0}$ , $Ξ_{c}^{0} \to Σ^{0} K_{S}^{0}$ , and $Ξ_{c}^{0} \to Σ^{+} K^{-}$ decays at Belle

Y. Li et al. (Belle Collaboration)

Phys. Rev. D 105, L011102 – Published 6 January 2022

Abstract

Using the entire data sample of $980 {fb}^{- 1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider, we present measurements of the branching fractions of the Cabibbo-favored decays $Ξ_{c}^{0} \to Λ K_{S}^{0}$ , $Ξ_{c}^{0} \to Σ^{0} K_{S}^{0}$ , and $Ξ_{c}^{0} \to Σ^{+} K^{-}$ . Taking the decay $Ξ_{c}^{0} \to Ξ^{-} π^{+}$ as the normalization mode, we measure the branching fraction ratio $B (Ξ_{c}^{0} \to Λ K_{S}^{0}) / B (Ξ_{c}^{0} \to Ξ^{-} π^{+}) = 0.229 \pm 0.008 \pm 0.012$ with improved precision, and measure the branching fraction ratios $B (Ξ_{c}^{0} \to Σ^{0} K_{S}^{0}) / B (Ξ_{c}^{0} \to Ξ^{-} π^{+}) = 0.038 \pm 0.006 \pm 0.004$ and $B (Ξ_{c}^{0} \to Σ^{+} K^{-}) / B (Ξ_{c}^{0} \to Ξ^{-} π^{+}) = 0.123 \pm 0.007 \pm 0.010$ for the first time. Taking into account the branching fraction of the normalization mode, the absolute branching fractions are determined to be $B (Ξ_{c}^{0} \to Λ K_{S}^{0}) = (3.27 \pm 0.11 \pm 0.17 \pm 0.73) \times 10^{- 3}$ , $B (Ξ_{c}^{0} \to Σ^{0} K_{S}^{0}) = (0.54 \pm 0.09 \pm 0.06 \pm 0.12) \times 10^{- 3}$ , and $B (Ξ_{c}^{0} \to Σ^{+} K^{-}) = (1.76 \pm 0.10 \pm 0.14 \pm 0.39) \times 10^{- 3}$ . The first and second uncertainties above are statistical and systematic, respectively, while the third ones arise from the uncertainty of the branching fraction of $Ξ_{c}^{0} \to Ξ^{-} π^{+}$ .

Received 17 November 2021
Accepted 14 December 2021

DOI:https://doi.org/10.1103/PhysRevD.105.L011102

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Physics Subject Headings (PhySH)

Branching fraction

Charmed baryons Lepton colliders

Particles & Fields

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Vol. 105, Iss. 1 — 1 January 2022

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Physical Review D

covering particles, fields, gravitation, and cosmology

Measurements of the branching fractions of $Ξ_{c}^{0} \to Λ K_{S}^{0}$ , $Ξ_{c}^{0} \to Σ^{0} K_{S}^{0}$ , and $Ξ_{c}^{0} \to Σ^{+} K^{-}$ decays at Belle

Y. Li et al. (Belle Collaboration)

Phys. Rev. D 105, L011102 – Published 6 January 2022

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Physical Review D

covering particles, fields, gravitation, and cosmology

Measurements of the branching fractions of Ξc0→ΛKS0, Ξc0→Σ0KS0, and Ξc0→Σ+K− decays at Belle

Y. Li et al. (Belle Collaboration)

Phys. Rev. D 105, L011102 – Published 6 January 2022

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Measurements of the branching fractions of $Ξ_{c}^{0} \to Λ K_{S}^{0}$ , $Ξ_{c}^{0} \to Σ^{0} K_{S}^{0}$ , and $Ξ_{c}^{0} \to Σ^{+} K^{-}$ decays at Belle