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arXiv · 1409.7644

Evidence of $Υ(1S) \to J/ψ+χ_{c1}$ and search for double-charmonium production in $Υ(1S)$ and $Υ(2S)$ decays

Belle Collaboration·S. D. Yang·C. P. Shen·Y. Ban·A. Abdesselam·I. Adachi·H. Aihara·S. Al Said·K. Arinstein·D. M. Asner·V. Aulchenko·T. Aushev·R. Ayad·A. M. Bakich·V. Bansal·P. Behera·B. Bhuyan·A. Bobrov·A. Bozek·M. Bračko·T. E. Browder·D. Červenkov·V. Chekelian·A. Chen·B. G. Cheon·K. Chilikin·R. Chistov·K. Cho·V. Chobanova·S. -K. Choi·Y. Choi·D. Cinabro·J. Dalseno·M. Danilov·J. Dingfelder·Z. Doležal·Z. Drásal·A. Drutskoy·K. Dutta·S. Eidelman·H. Farhat·J. E. Fast·T. Ferber·V. Gaur·N. Gabyshev·S. Ganguly·A. Garmash·R. Gillard·Y. M. Goh·B. Golob·J. Haba·T. Hara·H. Hayashii·X. H. He·W. -S. Hou·M. Huschle·T. Iijima·K. Inami·A. Ishikawa·R. Itoh·I. Jaegle·D. Joffe·K. K. Joo·T. Julius·T. Kawasaki·D. Y. Kim·H. J. Kim·J. B. Kim·J. H. Kim·K. T. Kim·K. Kinoshita·B. R. Ko·P. Kodyš·S. Korpar·P. Križan·P. Krokovny·A. Kuzmin·Y. -J. Kwon·J. S. Lange·J. Li·Y. Li·L. Li Gioi·J. Libby·D. Liventsev·P. Lukin·K. Miyabayashi·H. Miyata·A. Moll·R. Mussa·E. Nakano·M. Nakao·T. Nanut·N. K. Nisar·S. Nishida·S. Okuno·W. Ostrowicz·C. W. Park·H. Park·T. K. Pedlar·R. Pestotnik
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Abstract

Using data samples of $102\times10^6$ $Υ(1S)$ and $158\times10^6$ $Υ(2S)$ events collected with the Belle detector, a first experimental search has been made for double-charmonium production in the exclusive decays $Υ(1S,2S)\rightarrow J/ψ(ψ')+X$, where $X=η_c$, $χ_{cJ} (J=~0,~1,~2)$, $η_c(2S)$, $X(3940)$, and $X(4160)$. No significant signal is observed in the spectra of the mass recoiling against the reconstructed $J/ψ$ or $ψ'$ except for the evidence of $χ_{c1}$ production with a significance of $4.6σ$ for $Υ(1S)\rightarrow J/ψ+χ_{c1}$. The measured branching fraction $\BR(Υ(1S)\rightarrow J/ψ+χ_{c1})$ is $(3.90\pm1.21(\rm stat.)\pm0.23 (\rm syst.))\times10^{-6}$. The $90\%$ confidence level upper limits on the branching fractions of the other modes having a significance of less than $3σ$ are determined. These results are consistent with theoretical calculations using the nonrelativistic QCD factorization approach.

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Belle Collaboration, S. D. Yang, C. P. Shen, Y. Ban, A. Abdesselam, I. Adachi, H. Aihara, S. Al Said, K. Arinstein, D. M. Asner, V. Aulchenko, T. Aushev, R. Ayad, A. M. Bakich, V. Bansal, P. Behera, B. Bhuyan, A. Bobrov, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, R. Chistov, K. Cho, V. Chobanova, S. -K. Choi, Y. Choi, D. Cinabro, J. Dalseno, M. Danilov, J. Dingfelder, Z. Doležal, Z. Drásal, A. Drutskoy, K. Dutta, S. Eidelman, H. Farhat, J. E. Fast, T. Ferber, V. Gaur, N. Gabyshev, S. Ganguly, A. Garmash, R. Gillard, Y. M. Goh, B. Golob, J. Haba, T. Hara, H. Hayashii, X. H. He, W. -S. Hou, M. Huschle, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, I. Jaegle, D. Joffe, K. K. Joo, T. Julius, T. Kawasaki, D. Y. Kim, H. J. Kim, J. B. Kim, J. H. Kim, K. T. Kim, K. Kinoshita, B. R. Ko, P. Kodyš, S. Korpar, P. Križan, P. Krokovny, A. Kuzmin, Y. -J. Kwon, J. S. Lange, J. Li, Y. Li, L. Li Gioi, J. Libby, D. Liventsev, P. Lukin, K. Miyabayashi, H. Miyata, A. Moll, R. Mussa, E. Nakano, M. Nakao, T. Nanut, N. K. Nisar, S. Nishida, S. Okuno, W. Ostrowicz, C. W. Park, H. Park, T. K. Pedlar, R. Pestotnik. 2014-11-15. Evidence of $Υ(1S) \to J/ψ+χ_{c1}$ and search for double-charmonium production in $Υ(1S)$ and $Υ(2S)$ decays. https://doi.org/10.1103/physrevd.90.112008

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