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 — preprints:2004:ttp04-20 [2016/03/17 11:03] (current) Line 1: Line 1: + ====== 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. + ​ + |**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]] ​  | + | |