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The annihilation of virtual photons into pseudoscalar mesons

  • M. Diehl
  • P. Kroll
  • C. Vogt
Theoretical physics

Abstract.

We investigate the possibility to constrain the pion distribution amplitude from the \(\gamma^* \gamma^* \to\pi\) 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 \(\gamma^* \gamma^* \to\eta, \eta'\) form factors are also briefly discussed. We estimate that experimental studies might be feasible at the existing \(e^+e^-\) experiments BaBar, Belle, and CLEO.

Keywords

Experimental Study Form Factor Large Range Transition Form Distribution Amplitude 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg / Società Italiana di Fisica 2001

Authors and Affiliations

  • M. Diehl
    • 1
  • P. Kroll
    • 2
  • C. Vogt
    • 2
  1. 1.Deutsches Elektronen-Synchroton DESY, 22603 Hamburg, GermanyDE
  2. 2.Fachbereich Physik, Universität Wuppertal, 42097 Wuppertal, GermanyDE

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