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arXiv 1402.5840hep-ph
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B工厂包容性$J/ψ$生产中的初始状态辐射效应

Initial state radiation effects in inclusive $J/ψ$ production at B factories

Hua-Sheng Shao

摘要:

基于蒙特卡罗方法,分析了B工厂瞬发$\jpsi$包容性生产中的初态辐射效应。ISR使截面$σ(e^-e^+\to\jpsi+gg+X)$增加了约$15-25\%$,与QCD和相对论修正的结果几乎相同。此外,ISR轻微改变了$σ(e^-e^+\to\jpsi+c\bar{c}+X)$。在初始$e^{\pm}$束辐射的光子簇射之后,$e^-e^+\to\jpsi+gg+X$和$e^-e^+\to\jpsi+c\bar{c}+X$中的$\jpsi$动量谱变得更软。结合QCD、相对论和ISR修正后,得到了更精确的理论结果。新的结果提供了一个更严格的约束色八位组的贡献$σ(e^-e^+\to\jpsi+X_{\rm{non-}c\bar{c}})$。

英文摘要:

Based on Monte Carlo techniques, we analyze the initial state radiation (ISR) effects in prompt $\jpsi$ inclusive production at B factories. ISR enhances cross section $σ(e^-e^+\to\jpsi+gg+X)$ by about $15-25\%$, which is almost the same size as the QCD and relativistic correction. Moreover, ISR slightly changes $σ(e^-e^+\to\jpsi+c\bar{c}+X)$. The $\jpsi$ momentum spectrum in $e^-e^+\to\jpsi+gg+X$ and in $e^-e^+\to\jpsi+c\bar{c}+X$ is softer after the photon showering from the initial $e^{\pm}$ beam radiation. After combining the QCD,relativistic, and ISR corrections,a more precise theoretical result is obtained. The new result provides a more stringent constraint of the color-octet contribution to $σ(e^-e^+\to\jpsi+X_{\rm{non-}c\bar{c}})$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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