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Garg, R.; Bhardwaj, V.; Adachi, I.; Ahn, J. K.; Al Said, S.; Asner, D. M.; Aushev, T.; Babu, V.; Bansal, V.; Bilka, T.; Biswal, J.; Bobrov, A.; Bračko, M.; Cao, L.; Chen, A.; Cho, H. E.; Choi, S.-K.; Choi, Y.; Cunliffe, S.; Dash, N.; Dong, T. V.; Fast, J. E.; Fulsom, B. G.; Gaur, V.; Gabyshev, N.; Garmash, A.; Grzymkowska, O.; Hayasaka, K.; Hsu, C.-L.; Inguglia, G.; Ishikawa, A.; Itoh, R.; Jacobs, W. W.; Jeon, H. B.; Jia, S.; Jin, Y.; Joffe, D.; Julius, T.; Kawasaki, T.; Kim, D. Y.; Korpar, S.; Križan, P.; Kroeger, R.; Kuhr, T.; Kumar, R.; Lange, J. S.; Lee, S. C.; Li, C. H.; Li, Y. B.; Lu, P.-C.; MacNaughton, J.; Masuda, M.; Matsuda, T.; Matvienko, D.; Merola, M.; Miyabayashi, K.; Mizuk, R.; Mohanty, G. B.; Mussa, R.; Nishida, S.; Ono, H.; Onuki, Y.; Pakhlov, P.; Pakhlova, G.; Pal, B.; Pardi, S.; Patra, S.; Paul, S.; Pedlar, T. K.; Pestotnik, R.; Piilonen, L. E.; Prasanth, K.; Prencipe, E.; Resmi, P. K.; Rostomyan, A.; Russo, G.; Sakai, Y.; Sandilya, S.; Schneider, O.; Schueler, J.; Schwanda, C.; Seino, Y.; Senyo, K.; Shen, C. P.; Shibata, T.-A.; Shiu, J.-G.; Sokolov, A.; Sumiyoshi, T.; Tanida, K.; Tenchini, F.; Uchida, M.; Unno, Y.; Uno, S.; Wang, B.; Wang, C. H.; Wang, P.; Wang, X. L.; Won, E.; Yuan, C. Z.; Zhang, Z. P.
2019Report
We report the results of a search for the $B → Y(4260)K, Y(4260) → J/ψπ^+π^−$ decays. This study is based on a data sample corresponding to an integrated luminosity of $711 fb^{−1}$, collected at the $Υ(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^−$ collider. We investigate the $J/ψπ^+π^−$ invariant mass distribution in the range 4.0 to 4.6 $GeV/c^2$ using both $B^+ → J/ψπ^+π^− K^+$ and $B^0 → J/ψπ^+π^− K^0_S$ decays. We find excesses of events above the background levels, with a significances of 2.1 and 0.9 standard deviations for charged and neutral $B → Y(4260)K$ decays, respectively, taking into account the systematic uncertainties. These correspond to upper limits on the product of branching fractions, $\mathcal{B}(B^+ → Y(4260)K^+) × \mathcal{B}(Y(4260) → J/ψπ^+π^−) < 1.4 × 10^{−5}$ and $\mathcal{B}(B^0 → Y(4260)K^0) × \mathcal{B}(Y(4260) → J/ψπ^+π^−) < 1.7 × 10^{−5}$ at the 90\% confidence level.
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