Search for the $B \to Y(4260) K, ~Y(4260) \to J/\psi \pi^+\pi^-$ decays
Creators: name: Garg, R.
name: Bhardwaj, V.
name: Singh, J. B.
name: Adachi, I.
name: Ahn, J. K.
name: Aihara, H.
name: Al Said, S.
name: Asner, D. M.
name: Aulchenko, V.
name: Aushev, T.
name: Ayad, R.
name: Babu, V.
name: Bahinipati, S.
name: Bansal, V.
name: Beleño, C.
name: Bilka, T.
name: Biswal, J.
name: Bobrov, A.
name: Bozek, A.
name: Bračko, M.
name: Cao, L.
name: Červenkov, D.
name: Chen, A.
name: Cheon, B. G.
name: Chilikin, K.
name: Cho, H. E.
name: Cho, K.
name: Choi, S.-K.
name: Choi, Y.
name: Cinabro, D.
name: Cunliffe, S.
name: Dash, N.
name: Di Carlo, S.
name: Doležal, Z.
name: Dong, T. V.
name: Drásal, Z.
name: Eidelman, S.
name: Fast, J. E.
name: Fulsom, B. G.
name: Gaur, V.
name: Gabyshev, N.
name: Garmash, A.
name: Giri, A.
name: Golob, B.
name: Grzymkowska, O.
name: Haba, J.
name: Hayasaka, K.
name: Hayashii, H.
name: Hou, W.-S.
name: Hsu, C.-L.
name: Inami, K.
name: Inguglia, G.
name: Ishikawa, A.
name: Itoh, R.
name: Iwasaki, M.
name: Iwasaki, Y.
name: Jacobs, W. W.
name: Jeon, H. B.
name: Jia, S.
name: Jin, Y.
name: Joffe, D.
name: Joo, K. K.
name: Julius, T.
name: Kaliyar, A. B.
name: Kawasaki, T.
name: Kichimi, H.
name: Kim, D. Y.
name: Kim, J. B.
name: Kim, S. H.
name: Kinoshita, K.
name: Kodyš, P.
name: Korpar, S.
name: Kotchetkov, D.
name: Križan, P.
name: Kroeger, R.
name: Krokovny, P.
name: Kuhr, T.
name: Kumar, R.
name: Kwon, Y.-J.
name: Lange, J. S.
name: Lee, J. K.
name: Lee, S. C.
name: Li, C. H.
name: Li, L. K.
name: Li, Y. B.
name: Li Gioi, L.
name: Libby, J.
name: Liventsev, D.
name: Lu, P.-C.
name: Luo, T.
name: MacNaughton, J.
name: Masuda, M.
name: Matsuda, T.
name: Matvienko, D.
name: Merola, M.
name: Miyabayashi, K.
name: Miyata, H.
name: Mizuk, R.
name: Mohanty, G. B.
name: Mori, T.
name: Mussa, R.
name: Nakao, M.
name: Nath, K. J.
name: Nayak, M.
name: Nishida, S.
name: Nishimura, K.
name: Ogawa, S.
name: Ono, H.
name: Onuki, Y.
name: Pakhlov, P.
name: Pakhlova, G.
name: Pal, B.
name: Pardi, S.
name: Patra, S.
name: Paul, S.
name: Pedlar, T. K.
name: Pestotnik, R.
name: Piilonen, L. E.
name: Popov, V.
name: Prasanth, K.
name: Prencipe, E.
name: Resmi, P. K.
name: Rostomyan, A.
name: Russo, G.
name: Sakai, Y.
name: Salehi, M.
name: Sandilya, S.
name: Sanuki, T.
name: Schneider, O.
name: Schnell, G.
name: Schueler, J.
name: Schwanda, C.
name: Seino, Y.
name: Senyo, K.
name: Sevior, M. E.
name: Shebalin, V.
name: Shen, C. P.
name: Shibata, T.-A.
name: Shiu, J.-G.
name: Sokolov, A.
name: Solovieva, E.
name: Starič, M.
name: Stottler, Z. S.
name: Sumihama, M.
name: Sumiyoshi, T.
name: Takizawa, M.
name: Tanida, K.
name: Tenchini, F.
name: Trabelsi, K.
name: Uchida, M.
name: Uglov, T.
name: Unno, Y.
name: Uno, S.
name: Usov, Y.
name: Van Tonder, R.
name: Varner, G.
name: Varvell, K. E.
name: Waheed, E.
name: Wang, B.
name: Wang, C. H.
name: Wang, M.-Z.
name: Wang, P.
name: Wang, X. L.
name: Watanabe, M.
name: Won, E.
name: Yang, S. B.
name: Ye, H.
name: Yelton, J.
name: Yin, J. H.
name: Yuan, C. Z.
name: Zhang, Z. P.
name: Zhilich, V.
name: Zhukova, V.
name: Zhulanov, V.
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2019
Subjects: electron positron: annihilation
electron positron: colliding beams
B+: hadronic decay
B0: hadronic decay
Y(4260): hadronic decay
J/psi(3100)
pi: pair production
B+: branching ratio
B0: branching ratio
Y(4260): branching ratio
branching ratio: measured
Upsilon(10570): electroproduction
mass spectrum: (J/psi(3100) pi+ pi-)
background
BELLE
KEK-B
experimental results
B+ --&gt; Y(4260) K+
B0 --&gt; Y(4260) K0
Y(4260) --&gt; J/psi(3100) pi+ pi-

description: 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, $\mathcal{B}(B^+ → Y(4260)K^+) × \mathcal{B}(Y(4260) → J/ψπ^+π^−) &lt; 1.4 × 10^{−5}$ and $\mathcal{B}(B^0 → Y(4260)K^0) × \mathcal{B}(Y(4260) → J/ψπ^+π^−) &lt; 1.7 × 10^{−5}$ at the 90\% confidence level.