Evidence for the singly Cabibbo-suppressed decay ${\Omega }_c^0\to {\Xi }^{-}{\pi }^{+}$ and search for ${\Omega }_c^0\to {\Xi }^{-}{K}^{+}$ and ${\Omega }^{-}{K}^{+}$ decays at Belle

Abstract

Using a data sample of 980 fb${}^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider, we study for the first time the singly Cabibbo-suppressed decays ${\Omega }_c^0\to {\Xi }^{-}{\pi }^{+}$ and ${\Omega }^{-}{K}^{+}$ and the doubly Cabibbo-suppressed decay ${\Omega }_c^0\to {\Xi }^{-}{K}^{+}$. Evidence for an ${\Omega }_c^0$ signal in the ${\Omega }_c^0\to {\Xi }^{-}{\pi }^{+}$ mode is reported with a significance of $4.5\sigma$ including systematic uncertainties. The ratio of branching fractions to the normalization mode ${\Omega }_c^0\to {\Omega }^{-}{\pi }^{+}$ is measured to be $$\mathcal{B}({\Omega }_c^0\to {\Xi }^{-}{\pi }^{+})/\mathcal{B}({\Omega }_c^0\to {\Omega }^{-}{\pi }^{+})=0.253\pm 0.053(stat.)\pm 0.030(syst.).$$ No significant signals of ${\Omega }_c^0\to {\Xi }^{-}{K}^{+}$ and ${\Omega }^{-}{K}^{+}$ modes are found. The upper limits at $90\%$ confidence level on ratios of branching fractions are determined to be $$\mathcal{B}({\Omega }_c^0\to {\Xi }^{-}{K}^{+})/\mathcal{B}({\Omega }_c^0\to {\Omega }^{-}{\pi }^{+})<0.070$$ and $$\mathcal{B}({\Omega }_c^0\to {\Omega }^{-}{K}^{+})/\mathcal{B}({\Omega }_c^0\to {\Omega }^{-}{\pi }^{+})<\mathrm{0.29.}$$

11 pages, 2 figures

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• PYTHIA 6.4 Physics and Manual
• Charmed Baryon Physics Circa 2021
• Two-body hadronic weak decays of antitriplet charmed baryons
• Semileptonic Decays of Heavy Omega Baryons in a Quark Model
• Axial-Vector Emitting Weak Nonleptonic Deacys of ${\Omega }_c^0$ Baryon

Cited by in corpus (4)

• Anatomy of ${\Lambda }_c^{+}$ semileptonic decays
• Topological $SU(3{)}_f$ approach for two-body ${\Omega }_c$ weak decays
• Observation of Cabibbo-Suppressed Two-Body Hadronic Decays and Precision Mass Measurement of the ${\Omega }_c^0$ Baryon
• Semileptonic decay of double strangeness heavy flavor baryons