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arXiv 0910.3164hep-ph
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真空-束缚态关联函数的有效连续阈值

Effective continuum threshold for vacuum-to-bound-state correlators

Wolfgang Lucha, Dmitri Melikhov, Hagop Sazdjian, Silvano Simula

摘要:

我们提出了一种新的算法,用于获得真空-束缚态关联函数中的有效连续阈值,这是QCD中光锥求和规则方法计算强子形状因子的基本对象。有效连续阈值是该方法的关键成分之一,其在很大程度上确定从相关相关器提取的形状因子的值。在一个量子力学势模型,其中确切的形状因子是已知的,我们的算法的应用程序被证明导致一个显着增加的准确性提取的形状因子相比,在QCD求和规则的方法中采用的标准程序。此外,我们的算法的应用显着扩大的范围内的动量传递的形状因子可以从相关器中提取。

英文摘要:

We formulate a new algorithm for obtaining the effective continuum threshold in vacuum-to-bound-state correlators - the basic objects for the calculation of hadron form factors in the method of light-cone sum rules in QCD. The effective continuum threshold is one of the key ingredients of the method which to a large extent determines the value of the form factor extracted from the relevant correlator. In a quantum-mechanical potential model, where the exact form factor is known, the application of our algorithm is shown to lead to a dramatic increase of the accuracy of the extracted form factor compared to the standard procedures adopted in the method of sum rules in QCD. Moreover, the application of our algorithm considerably enlarges the range of the momentum transfer where the form factor may be extracted from the correlator.

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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