Eur. Phys. J. C 22, 439-450 (2001)
DOI: 10.1007/s100520100830
The annihilation of virtual photons into pseudoscalar mesons
M. Diehl1, P. Kroll2 and C. Vogt21 Deutsches Elektronen-Synchroton DESY, 22603 Hamburg, Germany
2 Fachbereich Physik, Universität Wuppertal, 42097 Wuppertal, Germany
(Received: 30 August 2001 / Published online: 23 November 2001 - © Springer-Verlag / Società Italiana di Fisica 2001 )
Abstract
We investigate the possibility to constrain the pion
distribution amplitude from the
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
form factors are also briefly discussed. We estimate that
experimental studies might be feasible at the existing
e+e-
experiments BaBar, Belle, and CLEO.
© Società Italiana di Fisica, Springer-Verlag 2001