Journal Article

Evidence for the singly Cabibbo-suppressed decay Ωc0→Ξ−π+ and search for Ωc0→Ξ−K+ and Ω−K+ decays at Belle

Hsu, C.-L., Jin, Y., Nakazawa, H., Borah, J., Kim, Y.-K., Nakao, M., Hayashii, H., Li, Y., Starič, M., Gaur, V., Chang, P., Kiesling, C., Hayasaka, K., Onuki, Y., Shapkin, M., Yang, S. B., Kinoshita, K., Kodyš, P., Doležal, Z., Sumiyoshi, T., Belous, K., Li, S. X., Cinabro, D., Kaliyar, A. B., Nisar, N. K., Chilikin, K., Di Capua, F., Kim, C. H., Uchida, M., Itoh, R., Unno, Y., Li, C. H., Natkaniec, Z., Li, J., Yuan, C. Z., Ferber, T., Branchini, P., De Pietro, G., Dhamija, R., Miyabayashi, K., Prim, M. T., Zhang, Z. P., Epifanov, D., Nakamura, I., Gioi, L. Li, Ogawa, S., Paul, S., Hara, T., Inami, K., Han, X., Schwanda, C., Kumar, M., Ono, H., Shwartz, B., Patra, S., Jang, E.-J., Mohanty, G. B., Fulsom, B. G., van Tonder, R., Kumara, K., Aushev, T., Nishida, S., Graziani, E., Hou, W.-S., De Nardo, G., Jacobs, W. W., Schnell, G., Maurya, S. K., Bilka, T., Savinov, V., Ahn, J. K., Krokovny, P., Gu, T., Bhardwaj, V., Ji, Q. P., Kovalenko, E., Križan, P., Asner, D. M., Pestotnik, R., Konno, T., Schueler, J., Dong, T. V., Lieret, K., Park, H., Červenkov, D., Kwon, Y.-J., Lee, S. C., Trabelsi, K., Li, L. K., Ayad, R., Behera, P., Pakhlova, G., Yuan, L., Senyo, K., Tenchini,

2023

Overview

A bstract 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 Ω c 0 → Ξ − π + and Ω − K + and the doubly Cabibbo-suppressed decay Ω c 0 → Ξ − K + . Evidence for an Ω c 0 signal in the Ω c 0 → Ξ − π + mode is reported with a significance of 4 . 5 σ including systematic uncertainties. The ratio of branching fractions to the normalization mode Ω c 0 → Ω − π + is measured to be B Ω c 0 → Ξ − π + / B Ω c 0 → Ω − π + = 0.253 ± 0.052 stat . ± 0.030 syst . . No significant signals of Ω c 0 → Ξ − K + and Ω − K + modes are found. The upper limits at 90% confidence level on ratios of branching fractions are determined to be B Ω c 0 → Ξ − K + / B Ω c 0 → Ω − π + < 0.070 and B Ω c 0 → Ω − K + / B Ω c 0 → Ω − π + < 0.29 .

• Publisher: Springer Berlin Heidelberg,Springer Nature B.V
• Subject: Classical and Quantum Gravitation / Confidence intervals / Decay / Elementary Particles / High energy physics / Physics / Physics and Astronomy / Quantum Field Theories / Quantum Field Theory / Quantum Physics / Quarks / Ratios / Regular Article - Experimental Physics / Relativity Theory / Sensors / String Theory