The annihilation of virtual photons into pseudoscalar mesons

Details The annihilation of virtual photons into pseudoscalar mesons The annihilation of virtual photons into pseudoscalar mesons

2001-08-27

arxiv.org/abs/hep-ph/0108220v1

Eur.Phys.J.C22:439-450,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages latex, 9 figures

Scientific paper

10.1007/s100520100830

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.

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