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arXiv · 2209.08583

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

Belle Collaboration·X. Han·S. Jia·L. Yuan·C. P. Shen·I. Adachi·J. K. Ahn·H. Aihara·D. M. Asner·T. Aushev·R. Ayad·V. Babu·S. Bahinipati·Sw. Banerjee·P. Behera·K. Belous·J. Bennett·M. Bessner·V. Bhardwaj·T. Bilka·D. Biswas·D. Bodrov·J. Borah·M. Bračko·P. Branchini·T. E. Browder·A. Budano·M. Campajola·D. Červenkov·M. -C. Chang·P. Chang·A. Chen·B. G. Cheon·K. Chilikin·H. E. Cho·K. Cho·S. -K. Choi·Y. Choi·S. Choudhury·D. Cinabro·G. De Nardo·G. De Pietro·R. Dhamija·F. Di Capua·Z. Doležal·T. V. Dong·D. Epifanov·T. Ferber·D. Ferlewicz·B. G. Fulsom·V. Gaur·A. Giri·P. Goldenzweig·E. Graziani·T. Gu·C. Hadjivasiliou·T. Hara·K. Hayasaka·H. Hayashii·W. -S. Hou·C. -L. Hsu·T. Iijima·K. Inami·N. Ipsita·A. Ishikawa·R. Itoh·M. Iwasaki·W. W. Jacobs·E. -J. Jang·Q. P. Ji·Y. Jin·A. B. Kaliyar·C. Kiesling·C. H. Kim·D. Y. Kim·Y. -K. Kim·K. Kinoshita·P. Kodyš·T. Konno·A. Korobov·S. Korpar·E. Kovalenko·P. Križan·P. Krokovny·T. Kuhr·M. Kumar·R. Kumar·K. Kumara·Y. -J. Kwon·T. Lam·M. Laurenza·S. C. Lee·C. H. Li·J. Li·L. K. Li·S. X. Li·Y. Li·Y. B. Li·L. Li Gioi·J. Libby
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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 $\Omega^0_c\to\Xi^{-}\pi^{+}$ and $\Omega^-K^+$ and the doubly Cabibbo-suppressed decay $\Omega^0_c\to \Xi^- K^{+}$. Evidence for an $\Omega^0_c$ signal in the $\Omega^0_c\to\Xi^-\pi^+$ 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 $${\cal B}(\Omega_{c}^{0} \to \Xi^{-} \pi ^{+} )/{\cal B}(\Omega_c^0\to \Omega^-\pi^+)=0.253\pm 0.053({\rm stat.})\pm 0.030({\rm syst.}).$$ No significant signals of $\Omega^0_c\to\Xi^-K^+$ and $\Omega^-K^+$ modes are found. The upper limits at $90\%$ confidence level on ratios of branching fractions are determined to be $${\cal B}(\Omega_{c}^{0} \to \Xi^{-} K ^{+})/{\cal B}(\Omega_c^0\to \Omega^-\pi^+) < 0.070$$ and $${\cal B}(\Omega_{c}^{0} \to \Omega^{-}K^{+})/{\cal B}(\Omega_c^0\to \Omega^-\pi^+) < 0.29.$$

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Belle Collaboration, X. Han, S. Jia, L. Yuan, C. P. Shen, I. Adachi, J. K. Ahn, H. Aihara, D. M. Asner, T. Aushev, R. Ayad, V. Babu, S. Bahinipati, Sw. Banerjee, P. Behera, K. Belous, J. Bennett, M. Bessner, V. Bhardwaj, T. Bilka, D. Biswas, D. Bodrov, J. Borah, M. Bračko, P. Branchini, T. E. Browder, A. Budano, M. Campajola, D. Červenkov, M. -C. Chang, P. Chang, A. Chen, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S. -K. Choi, Y. Choi, S. Choudhury, D. Cinabro, G. De Nardo, G. De Pietro, R. Dhamija, F. Di Capua, Z. Doležal, T. V. Dong, D. Epifanov, T. Ferber, D. Ferlewicz, B. G. Fulsom, V. Gaur, A. Giri, P. Goldenzweig, E. Graziani, T. Gu, C. Hadjivasiliou, T. Hara, K. Hayasaka, H. Hayashii, W. -S. Hou, C. -L. Hsu, T. Iijima, K. Inami, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, E. -J. Jang, Q. P. Ji, Y. Jin, A. B. Kaliyar, C. Kiesling, C. H. Kim, D. Y. Kim, Y. -K. Kim, K. Kinoshita, P. Kodyš, T. Konno, A. Korobov, S. Korpar, E. Kovalenko, P. Križan, P. Krokovny, T. Kuhr, M. Kumar, R. Kumar, K. Kumara, Y. -J. Kwon, T. Lam, M. Laurenza, S. C. Lee, C. H. Li, J. Li, L. K. Li, S. X. Li, Y. Li, Y. B. Li, L. Li Gioi, J. Libby. 2022-09-18. Evidence for the singly Cabibbo-suppressed decay $\Omega^0_c\to\Xi^-\pi^+$ and search for $\Omega^0_c\to\Xi^-K^+$ and $\Omega^-K^+$ decays at Belle. https://doi.org/10.1007/jhep01(2023)055

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