The annihilation of virtual photons into pseudoscalar mesons

被引：43

作者：

Diehl, M ^{[1
]}

Kroll, P

Vogt, C

机构：

[1] DESY, Deutsch Elektronen Synchroton, D-22603 Hamburg, Germany

[2] Berg Univ Wuppertal, Fachbereich Phys, D-42097 Wuppertal, Germany

来源：

EUROPEAN PHYSICAL JOURNAL C | 2001年 / 22卷 / 03期

关键词：

D O I：

10.1007/s100520100830

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We investigate the possibility to constrain the pion distribution amplitude from the gamma*gamma* --> pi transition. For a surprisingly large range in the two photon virtualities we find that the transition form factor is essentially independent of the distribution amplitude. This in turn entails a parameter-free prediction of QCD. The gamma*gamma* --> eta,eta' form factors are also briefly discussed. We estimate that experimental studies might be feasible at the existing e(+)e(-) experiments BaBar, Belle, and CLEO.

引用

页码：439 / 450

页数：12

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