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arXiv 0809.0130hep-ph
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光锥QCD求和规则中的重轻跃迁形状因子及其关系

Heavy-to-light transition form factors and their relations in light-cone QCD sum rules

Tao Huang, Zuo-Hong Li, Fen Zuo

摘要:

本文系统地回顾了利用手征流相关器改进的光锥QCD求和规则,并将其应用于所有的重-轻形状因子的计算,包括所有的半轻子和企鹅形状因子。通过选择合适的手征流,使所有形状因子的光锥求和规则大大简化,并主要依赖于轻介子的一个主导扭转分布振幅。结果,这些形状因子之间的关系自然出现。在考虑的准确性下,这些关系再现了文献中获得的结果。此外,由于明确的依赖于领先的扭曲分布振幅被保存,这些关系可能是更有用的模拟实验数据和提取的信息上的分布振幅。

英文摘要:

The improved light-cone QCD sum rules by using chiral current correlator is systematically reviewed and applied to the calculation of all the heavy-to-light form factors, including all the semileptonic and penguin ones. By choosing suitable chiral currents, the light-cone sum rules for all the form factors are greatly simplified and depend mainly on one leading twist distribution amplitude of the light meson. As a result, relations between these form factors arise naturally. At the considered accuracy these relations reproduce the results obtained in the literature. Moreover, since the explicit dependence on the leading twist distribution amplitudes is preserved, these relations may be more useful to simulate the experimental data and extract the information on the distribution amplitude.

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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