====== TTP04-20 Modeling the Pion and Kaon Form Factors in the Timelike Region ======
 
 
   <hidden TTP04-20  Modeling the Pion and Kaon Form Factors in the Timelike Region > New, accurate measurements of the pion and kaon electromagnetic form factors
 are expected in the near future from experiments at electron-positron
 colliders,using the radiative return method. We construct a model for the
 timelike pion electromagnetic form factor, that is valid also at momentum
 transfers far above the $\rho$ resonance. The ansatz is based on vector
 dominance and includes a pattern of radial excitations expected from dual
 resonance models.The form factor is fitted to the existing data in the timelike
 region, continued to the spacelike region and compared with the measurements
 there and with the QCD predictions. Furthermore, the model is extended to the
 kaon electromagnetic form factor. Using isospin and SU(3)-flavour symmetry
 relations we extract the isospin-one contribution and predict the kaon weak
 form factor accessible in semileptonic tau decays.
 </hidden>
|**Christine Bruch, Alexander Khodjamirian, Johann, H. Kuhn**  | 
|**  Eur.Phys.J.  C39 41-54 2005  **  |
| {{preprints:2004:ttp04-20.pdf|PDF}} {{preprints:2004:ttp04-20.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/0409080|arXiv]]   |
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