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The cross section of the process e ++e −→J/ψ+η c within the QCD light-cone sum rules

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Abstract

We calculate the cross section of the exclusive process e ++e −→J/ψ+η c at the leading order approximation within the QCD light-cone sum rules approach. It is found that the form factor F VP(V=J/ψ,P=η c ) depends mainly on the behavior of the twist-2 distribution amplitude of the η c meson at the scale of this process. Thus in order to obtain a reliable estimation of the cross section, it is important to have a realistic distribution amplitude of the η c meson and to deal with the evolution of the distribution amplitude to the effective energy scale of the process. Our results show that one can obtain a compatible prediction with the Belle and BaBar experimental data.

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Authors and Affiliations

  1. Department of Modern Physics, University of Science and Technology of China, Hefei, 230026, P.R. China

    Yan-Jun Sun

  2. Institute of High Energy Physics and Theoretical Physics Enter for Science Facilities, Chinese Academy of Sciences, Beijing, 100049, P.R. China

    Yan-Jun Sun & Tao Huang

  3. Department of Physics, Chongqing University, Chongqing, 400044, P.R. China

    Xing-Gang Wu

  4. Key Laboratory of Frontiers in Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, P.R. China

    Fen Zuo

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  1. Yan-Jun Sun
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  2. Xing-Gang Wu
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  3. Fen Zuo
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  4. Tao Huang
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Correspondence to Yan-Jun Sun.

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Sun, YJ., Wu, XG., Zuo, F. et al. The cross section of the process e ++e −→J/ψ+η c within the QCD light-cone sum rules. Eur. Phys. J. C 67, 117–123 (2010). https://doi.org/10.1140/epjc/s10052-010-1280-z

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  • DOI: https://doi.org/10.1140/epjc/s10052-010-1280-z

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