Belle CollaborationGarg, R.Bhardwaj, V.Singh, J. B.Adachi, I.Ahn, J. K.Aihara, H.Al Said, S.Asner, D. M.Aulchenko, V.Aushev, T.Ayad, R.Babu, V.Bahinipati, S.Bansal, V.Beleno, C.Bilka, T.Biswal, J.Bobrov, A.Bozek, A.Bračko, M.Cao, L.Cervenkov, D. T.Chen, A.Cheon, B. G.Chilikin, K.Cho, H. E.Cho, K.Choi, S.-K.Choi, Y.Cinabro, D.Cunliffe, S.Dash, N.Di Carlo, S.Doležal, Z.Dong, T. V.Drasal, Z.Eidelman, S.Fast, J. E.Fulsom, B. G.Gaur, V.Gabyshev, N.Garmash, A.Giri, A.Golob, B.Grzymkowska, O.Haba, J.Hayasaka, K.Hayashii, H.Hou, W.-S.Hsu, C.-L.Inami, K.Inguglia, G.Ishikawa, A.Itoh, R.Iwasaki, M.Iwasaki, Y.Jacobs, W. W.Jeon, H. B.Jia, S.Jin, Y.Joffe, D.Joo, K. K.Julius, T.Kaliyar, A. B.Kawasaki, T.Kichimi, H.Kim, D. Y.Kim, J. B.Kim, S. H.Kinoshita, K.Kodyš, P.Korpar, S.Kotchetkov, D.Križan, P.Kroeger, R.Krokovny, P.Kuhr, T.Kumar, R.Kwon, Y-J.Lange, J. S.Lee, J. K.Lee, S. C.Li, C. H.Li, L. K.Li, Y. B.Gioi, L. LiLibby, J.Liventsev, D.Lu, P-C.Luo, T.MacNaughton, J.Masuda, M.Matsuda, T.Matvienko, D.Merola, M.Miyabayashi, K.Miyata, H.Mizuk, R.Mohanty, G. B.Mori, T.Mussa, R.Nakao, M.Nath, K. J.Nayak, M.Nishida, S.Nishimura, K.Ogawa, S.Ono, H.Onuki, Y.Pakhlov, P.Pakhlova, G.Pal, B.Pardi, S.Patra, S.Paul, S.Pedlar, T. K.Pestotnik, R.Piilonen, Leo E.Popov, V.Prasanth, K.Prencipe, E.Resmi, P. K.Rostomyan, A.Russo, G.Sakai, Y.Salehi, M.Sandilya, S.Sanuki, T.Schneider, O.Schnell, G.Schueler, J.Schwanda, C.Seino, Y.Senyo, K.Sevior, M. E.Shebalin, V.Shen, C. P.Shibata, T. A.Shiu, J-G.Sokolov, A.Solovieva, E.Starič, M.Stottler, Z. S.Sumihama, M.Sumiyoshi, T.Takizawa, M.Tanida, K.Tenchini, F.Trabelsi, K.Uchida, M.Uglov, T.Unno, Y.Uno, S.Usov, Y.Van Tonder, R.Varner, G.Varvell, K. E.Waheed, E.Wang, B.Wang, C. H.Wang, M-Z.Wang, P.Wang, X. L.Watanabe, M.Won, E.Yang, S. B.Ye, H.Yelton, J.Yin, J. H.Yuan, C. Z.Zhang, Z. P.Zhilich, V.Zhukova, V.Zhulanov, V.2019-08-132019-08-132019-04-122470-001071102http://hdl.handle.net/10919/93044We report the results of a search for the B -> Y(4260)K, Y(4260) -> J/psi pi(+)pi thorn p-decays. This study is based on a data sample corresponding to an integrated luminosity of 711 fb(-1), collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We investigate the J/psi pi(+)pi(-) thorn p-invariant mass distribution in the range 4.0 to 4.6 GeV/c(2) using both B+ -> J/psi pi(+)pi K--(+) and B-0 -> J/psi pi(+)pi K--(S)0 decays. We find excesses of events above the background levels, with 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, B(B+ -> Y(4260)K+) x B(Y(4260) -> J/psi pi(+)pi(-)) < 1.4 x 10(-5) and B(B-0 -> Y(4260)K-0) x B(Y(4260) -> J/psi pi(+)pi(-)) < 1.7 x 10(-5) at the 90% confidence level.application/pdfenCreative Commons CC0 1.0 Universal Public Domain DedicationArticle - Refereedhttps://doi.org/10.1103/PhysRevD.99.0711029972470-0029