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arXiv 1012.3542hep-ph
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光子到赝标介子跃迁的形状因子——更新

The form factors for the photon to pseudoscalar meson transitions - an update

P. Kroll

AI总结:

本文采用保留夸克横向自由度的修正微扰方法,更新分析π、η、η'和ηc与光子跃迁的形状因子,发现仅需小幅调整分布振幅即可符合实验,唯π-光子需强的第二Gegenbauer项贡献。

摘要:

在保留夸克横向自由度的修正微扰方法框架内,分析了π-光子、η-光子、η'-光子以及ηc-光子跃迁的形状因子。将形状因子的结果与实验进行了详细比较。与同一方法下以往的计算相比,为了与实验达成一致,通常只需要对介子分布振幅作很小的修改。仅对于π-光子形状因子,发现来自第二项Gegenbauer项的显著贡献。文中还对双虚光子情形以及类时区中的跃迁形状因子作了评论。

英文摘要:

The form factors for the transitions pi-photon, eta-photon, eta'-photon and etac-photon are analyzed within the modified perturbative approach in which quark transverse degrees of freedom are retained. The results for the form factors are compared to experiment in detail. As compared to previous calculations within the same approach only little modifications of the meson distribution amplitudes are required in general in order to achieve agreement with experiment. Only for the pi-photon form factor a strong contribution from the second Gegenbauer term is found. It is also commented on the case of two virtual photons and on the transition form factors in the time-like region.

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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