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arXiv 0712.0178hep-ph
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光锥求和法提取过渡形状因子的系统误差

Systematic errors of transition form factors extracted by means of light-cone sum rules

Wolfgang Lucha, Dmitri Melikhov, Silvano Simula

摘要:

本次演讲介绍了我们的研究结果的重到轻的过渡形状因子提取的帮助下,光锥求和规则。我们采用一个模型与标量粒子通过无质量玻色子交换相互作用,并研究了重轻相关,相关的过渡形状因子的提取。我们用两种不同的方法计算这个相关器:利用光束缚态的Bethe-Salpeter波函数和利用光锥展开。这使我们能够计算完整的相关器和单独的光锥的贡献。以这种方式,我们表明,关闭光锥的贡献没有被抑制相比,光锥的任何大参数。从数值上讲,发现从完整相关器提取的形状因子的值与从光锥对该相关器的贡献提取的形状因子的值之间的差异在衰变过程中涉及的粒子的宽质量范围内约为20-30%。

英文摘要:

This talk presents results of our study of heavy-to-light transition form factors extracted with the help of light-cone sum rules. We employ a model with scalar particles interacting via massless-boson exchange and study the heavy-to-light correlator, relevant for the extraction of the transition form factor. We calculate this correlator in two different ways: by making use of the Bethe-Salpeter wave function of the light bound state and by making use of the light-cone expansion. This allows us to calculate the full correlator and separately the light-cone contribution to it. In this way we show that the off-light cone contributions are not suppressed compared to the light-cone one by any large parameter. Numerically, the difference between the value of the form factor extracted from the full correlator and from the light-cone contribution to this correlator is found to be about 20-30% in a wide range of masses of the particles involved in the decay process.

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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