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Jia, S.; Shen, C. P.; Ahn, J. K.; Aihara, H.; Aushev, T.; Babu, V.; Bahinipati, S.; Banerjee, Sw; Behera, P.; Belous, K.; Bennett, J.; Bhardwaj, V.; Biswas, D.; Bodrov, D.; Borah, J.; Branchini, P.; Browder, T. E.; Budano, A.; Campajola, M.; Chen, A.; Choudhury, S.; Cinabro, D.; Ferlewicz, D.; Gaur, V.; Giri, A.; Goldenzweig, P.; Hadjivasiliou, C.; Hara, T.; Hayasaka, K.; Hayashii, H.; Hou, W.-S.; Iijima, T.; Inami, K.; Ipsita, N.; Ishikawa, A.; Iwasaki, M.; Jacobs, W. W.; Jang, E.-J.; Ji, Q. P.; Kiesling, C.; Kim, D. Y.; Kodyš, P.; Korobov, A.; Korpar, S.; Kovalenko, E.; Kuhr, T.; Kumar, R.; Kumara, K.; Kwon, Y.-J.; Lam, T.; Laurenza, M.; Lee, S. C.; Li, J.; Li, L. K.; Li, Y.; Li, Y. B.; Gioi, L. Li; Lieret, K.; Masuda, M.; Miyabayashi, K.; Nakamura, I.; Ogawa, S.; Ono, H.; Onuki, Y.; Pakhlova, G.; Park, H.; Pedlar, T. K.; Pestotnik, R.; Piilonen, L. E.; Prencipe, E.; Prim, M. T.; Rout, N.; Russo, G.; Sandilya, S.; Santelj, L.; Savinov, V.; Schwanda, C.; Seino, Y.; Senyo, K.; Shan, W.; Shapkin, M.; Shiu, J.-G.; Starič, M.; Sumihama, M.; Takizawa, M.; Tanida, K.; Trabelsi, K.; Uchida, M.; Uglov, T.; Unno, Y.; Uno, K.; Uno, S.; van Tonder, R.; Yabsley, B. D.; Yan, W.; Yelton, J.; Yin, J. H.; Yuan, C. Z.; Zhang, Z. P.; Zhilich, V.
The journal of high energy physics, 01/2023, Letnik: 2023, Številka: 1Journal Article
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 $$ {\Omega}_c^0\to {\Xi}^{-}{\pi}^{+} $$ Ω c 0 → Ξ − π + and Ω − K + and the doubly Cabibbo-suppressed decay $$ {\Omega}_c^0\to {\Xi}^{-}{K}^{+} $$ Ω c 0 → Ξ − K + . Evidence for an $$ {\Omega}_c^0 $$ Ω c 0 signal in the $$ {\Omega}_c^0 $$ 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 $$ {\Omega}_c^0 $$ Ω c 0 → Ω − π + is measured to be $$ \mathcal{B}\left({\Omega}_c^0\to {\Xi}^{-}{\pi}^{+}\right)/\mathcal{B}\left({\Omega}_c^0\to {\Omega}^{-}{\pi}^{+}\right)=0.253\pm 0.052\left(\textrm{stat}.\right)\pm 0.030\left(\textrm{syst}.\right). $$ B Ω c 0 → Ξ − π + / B Ω c 0 → Ω − π + = 0.253 ± 0.052 stat . ± 0.030 syst . . No significant signals of $$ {\Omega}_c^0\to {\Xi}^{-}{K}^{+} $$ 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 $$ \mathcal{B}\left({\Omega}_c^0\to {\Xi}^{-}{K}^{+}\right)/\mathcal{B}\left({\Omega}_c^0\to {\Omega}^{-}{\pi}^{+}\right)<0.070 $$ B Ω c 0 → Ξ − K + / B Ω c 0 → Ω − π + < 0.070 and $$ \mathcal{B}\left({\Omega}_c^0\to {\Omega}^{-}{K}^{+}\right)/\mathcal{B}\left({\Omega}_c^0\to {\Omega}^{-}{\pi}^{+}\right)<0.29. $$ B Ω c 0 → Ω − K + / B Ω c 0 → Ω − π + < 0.29 .
