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arXiv · 1901.06470

Search for the $B \to Y(4260) K, ~Y(4260) \to J/\psi \pi^+\pi^-$ decays

Belle collaboration·R. Garg·V. Bhardwaj·J. B. Singh·I. Adachi·J. K. Ahn·H. Aihara·S. Al Said·D. M. Asner·V. Aulchenko·T. Aushev·R. Ayad·V. Babu·S. Bahinipati·V. Bansal·C. Beleño·T. Bilka·J. Biswal·A. Bobrov·A. Bozek·M. Bračko·L. Cao·D. Červenkov·A. Chen·B. G. Cheon·K. Chilikin·H. E. Cho·K. Cho·S. -K. Choi·Y. Choi·D. Cinabro·S. Cunliffe·N. Dash·S. Di Carlo·Z. Doležal·T. V. Dong·Z. Drásal·S. Eidelman·J. E. Fast·B. G. Fulsom·V. Gaur·N. Gabyshev·A. Garmash·A. Giri·B. Golob·O. Grzymkowska·J. Haba·K. Hayasaka·H. Hayashii·W. -S. Hou·C. -L. Hsu·K. Inami·G. Inguglia·A. Ishikawa·R. Itoh·M. Iwasaki·Y. Iwasaki·W. W. Jacobs·H. B. Jeon·S. Jia·Y. Jin·D. Joffe·K. K. Joo·T. Julius·A. B. Kaliyar·T. Kawasaki·H. Kichimi·D. Y. Kim·J. B. Kim·S. H. Kim·K. Kinoshita·P. Kodyš·S. Korpar·D. Kotchetkov·P. Križan·R. Kroeger·P. Krokovny·T. Kuhr·R. Kumar·Y. -J. Kwon·J. S. Lange·J. K. Lee·S. C. Lee·C. H. Li·L. K. Li·Y. B. Li·L. Li Gioi·J. Libby·D. Liventsev·P. -C. Lu·T. Luo·J. MacNaughton·M. Masuda·T. Matsuda·D. Matvienko·M. Merola·K. Miyabayashi·H. Miyata·R. Mizuk·G. B. Mohanty
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Abstract

We report the results of a search for the $B \to Y(4260) K, ~Y(4260)\to J/\psi\pi^+\pi^-$ 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 $J/\psi\pi^+\pi^-$ invariant mass distribution in the range 4.0 to 4.6 GeV/$c^2$ using both $B^+ \to J/\psi \pi^+\pi^- K^+$ and $B^0 \to J/\psi \pi^+\pi^- K^0_S$ 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 $B \to Y(4260) K$ decays, respectively, taking into account the systematic uncertainties. These correspond to upper limits on the product of branching fractions, ${\cal B}(B^+ \to Y(4260) K^+) \times {\cal B}(Y(4260) \to J/\psi \pi^+ \pi^-) <1.4 \times 10^{-5}$ and ${\cal B}(B^0 \to Y(4260) K^0) \times {\cal B}(Y(4260) \to J/\psi \pi^+ \pi^-) <1.7 \times 10^{-5}$ at the 90\% confidence level.

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Belle collaboration, R. Garg, V. Bhardwaj, J. B. Singh, I. Adachi, J. K. Ahn, H. Aihara, S. Al Said, D. M. Asner, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, S. Bahinipati, V. Bansal, C. Beleño, T. Bilka, J. Biswal, A. Bobrov, A. Bozek, M. Bračko, L. Cao, D. Červenkov, A. Chen, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S. -K. Choi, Y. Choi, D. Cinabro, S. Cunliffe, N. Dash, S. Di Carlo, Z. Doležal, T. V. Dong, Z. Drásal, S. Eidelman, J. E. Fast, B. G. Fulsom, V. Gaur, N. Gabyshev, A. Garmash, A. Giri, B. Golob, O. Grzymkowska, J. Haba, K. Hayasaka, H. Hayashii, W. -S. Hou, C. -L. Hsu, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, H. B. Jeon, S. Jia, Y. Jin, D. Joffe, K. K. Joo, T. Julius, A. B. Kaliyar, T. Kawasaki, H. Kichimi, D. Y. Kim, J. B. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Križan, R. Kroeger, P. Krokovny, T. Kuhr, R. Kumar, Y. -J. Kwon, J. S. Lange, J. K. Lee, S. C. Lee, C. H. Li, L. K. Li, Y. B. Li, L. Li Gioi, J. Libby, D. Liventsev, P. -C. Lu, T. Luo, J. MacNaughton, M. Masuda, T. Matsuda, D. Matvienko, M. Merola, K. Miyabayashi, H. Miyata, R. Mizuk, G. B. Mohanty. 2019-01-19. Search for the $B \to Y(4260) K, ~Y(4260) \to J/\psi \pi^+\pi^-$ decays. https://doi.org/10.1103/physrevd.99.071102

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