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arXiv 0911.0139hep-ph
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通过色单态机制研究J/O2衰变中的包容产生

Inclusive J/ψProduction In ΥDecay Via Color-singlet Mechanism

Zhi-Guo He, Jian-Xiong Wang

摘要:

我们重新考虑了在α_{s}^{5}阶QCD过程<$\to J/<$+ \bar{c} +g和α^{2}α_s^{2}阶QED过程<$\to γ^{ \ast } \to J/<$+ \bar{c}和<$\to J/<$+gg中包含J/<$产生的树级色单态贡献.结果表明,QED过程的贡献与QCD过程的贡献是一致的,仅QCD过程的数值结果比以前的理论预测小一个数量级,我们的理论预测总体上比最近CLEO对分支分数B(\to J/X+)的测量小一个数量级.结果表明,对γ衰变中J/γ产生机制的认识还不够深入,还需要进一步的理论研究和实验分析。

英文摘要:

We reconsider the tree level color-singlet contribution for the inclusive J/ψproduction in Υdecay with the α_{s}^{5} order QCD process Υ\to J/ψ+c\bar{c}+g and α^{2}α_s^{2} order QED processes Υ\toγ^{\ast}\to J/ψ+c\bar{c} and Υ\to J/ψ+gg. It is found that the contribution of the QED process is compatible with that of the QCD process, and the numerical results for the QCD process alone is an order of magnitude smaller than the previous theoretical predictions, and our theoretical prediction in total is about an order of magnitude smaller than the recent CLEO measurement on the branching fraction B(Υ\to J/ψ+X). It indicates that the J/ψproduction mechanism in Υdecay is not well understood, and further theoretical work and experimental analysis are still necessary.

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