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Evidence for the singly Cabibbo-suppressed decay Ωc0→Ξ−π+ {\Omega}_c^0\to {\Xi}^{-}{\pi}^{+} and search for Ωc0→Ξ−K+ {\Omega}_c^0\to {\Xi}^{-}{K}^{+} and Ω−^{−}K+^{+} decays at Belle

Collaboration
•
Sep 18, 2022
12 pages
Published in:
  • JHEP 01 (2023) 055
  • Published: Jan 12, 2023
e-Print:
DOI:
Report number:
  • Belle Preprint 2022-20,
  • KEK Preprint 2022-28,
  • Belle Preprint 2022-20; KEK Preprint 2022-28
Experiments:
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Abstract: (Springer)
Using a data sample of 980 fb−1^{−1} collected with the Belle detector at the KEKB asymmetric-energy e+^{+}e−^{−} collider, we study for the first time the singly Cabibbo-suppressed decays Ωc0→Ξ−π+ {\Omega}_c^0\to {\Xi}^{-}{\pi}^{+} and Ω−^{−}K+^{+} and the doubly Cabibbo-suppressed decay Ωc0→Ξ−K+ {\Omega}_c^0\to {\Xi}^{-}{K}^{+} . Evidence for an Ωc0 {\Omega}_c^0 signal in the Ωc0 {\Omega}_c^0 → Ξ−^{−}π+^{+} mode is reported with a significance of 4.5σ including systematic uncertainties. The ratio of branching fractions to the normalization mode Ωc0 {\Omega}_c^0 → Ω−^{−}π+^{+} is measured to beB(Ωc0→Ξ−π+)/B(Ωc0→Ω−π+)=0.253±0.052(stat.)±0.030(syst.). \mathcal{B}\left({\Omega}_c^0\to {\Xi}^{-}{\pi}^{+}\right)/\mathcal{B}\left({\Omega}_c^0\to {\Omega}^{-}{\pi}^{+}\right)=0.253\pm 0.052\left(\textrm{stat}.\right)\pm 0.030\left(\textrm{syst}.\right). No significant signals of Ωc0→Ξ−K+ {\Omega}_c^0\to {\Xi}^{-}{K}^{+} and Ω−^{−}K+^{+} modes are found. The upper limits at 90% confidence level on ratios of branching fractions are determined to beB(Ωc0→Ξ−K+)/B(Ωc0→Ω−π+)<0.070 \mathcal{B}\left({\Omega}_c^0\to {\Xi}^{-}{K}^{+}\right)/\mathcal{B}\left({\Omega}_c^0\to {\Omega}^{-}{\pi}^{+}\right)<0.070 andB(Ωc0→Ω−K+)/B(Ωc0→Ω−π+)<0.29. \mathcal{B}\left({\Omega}_c^0\to {\Omega}^{-}{K}^{+}\right)/\mathcal{B}\left({\Omega}_c^0\to {\Omega}^{-}{\pi}^{+}\right)<0.29. [graphic not available: see fulltext]
Note:
  • 11 pages, 2 figures
  • Branching fraction
  • Charm Physics
  • e+-e− Experiments
  • Particle and Resonance Production
  • electron positron: annihilation
  • electron positron: colliding beams
  • Omega/c0: hadronic decay
  • Xi-
  • Omega-
  • pi+
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