Meson-photon transition form factors

被引：91

作者：

Jakob, R

Kroll, P

Raulfs, M

机构：

[1] Fachbereich Physik, Universität Wuppertal

来源：

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS | 1996年 / 22卷 / 01期

关键词：

D O I：

10.1088/0954-3899/22/1/004

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We report results on the pi-gamma transition form factor obtained within the hard scattering approach including transverse momentum effects and Sudakov corrections. The results clearly favour distribution amplitudes dose to the asymptotic form, similar to x(1)x(2), and disfavour distribution amplitudes which are strongly concentrated in the end-point regions. This observation is backed by information on the elastic form factor of the pion and on its valence-quark distribution function. Applications of our approach to the eta-gamma and eta'-gamma transition form factors are discussed as well. Combining the form factor data with the two-photon decay widths, we determine the eta and the eta' decay constants and the eta-eta' mixing angle.

引用

页码：45 / 58

页数：14

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