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arXiv 0904.4875hep-ph
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软能区的Upperdam-> X γ光子谱

The Upsilon -> X gamma photon spectrum in the soft-energy region

Pedro Ruiz-Femenia

摘要:

对于光子能量为w ~ m_b α_s的Uppersonal-> X γ光子能谱,次至首阶微扰QCD修正的主要贡献可以从正电子偶素衰变谱的O(α)修正的知识中简单地得到。后者可以从正电子偶素光子谱的NRQED计算中获得,或者通过将阈值展开应用于单圈QED振幅,正如在这次演讲中所解释的那样。

英文摘要:

The dominant contribution of the next-to-leading order perturbative QCD corrections to the Upsilon -> X gamma photon energy spectrum for photon energies w ~ m_b alpha_s can be obtained trivially from the knowledge of the corresponding O(alpha) correction to the positronium decay spectrum in the same region. The latter can be obtained from the NRQED computation of the orthopositronium photon spectrum, or by applying the threshold expansion to the 1-loop QED amplitude, as it is explained in this talk.

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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