====== TTP04-26 The radiative return and form factors at large $Q^2$ ======
 
 
<hidden TTP04-26  The radiative return and form factors at large $Q^2$ > The measurement of the pion form factor and, more
 generally, of the cross section for electron--positron annihilation
 into hadrons through the radiative return has become an important
 task for high luminosity colliders such as the $\Phi$- or
 $B$-meson factories. For a detailed understanding and analysis
 of this reaction, the construction of a Monte Carlo program, 
 PHOKHARA, has been undertaken. A brief overview of
 the most recent developments is presented, which include the combination
 of initial- and final-state radiation in the case of two-pion
 production. Baryon pair production is now included and 
 the pion form factor is extended into the region of large $Q^2$. 
 A model for the kaon
 form factor is discussed which is 
 fitted to $K^+K^-$ and $K^0\bar{K}^0$ data and which 
 leads to predictions for the $\tau$-decay into $K^-K^0\nu$.
 </hidden>
|**J.H. Kuhn**  | 
|**      Proceedings of the Eighth International Workshop on Tau Lepton Physics (TAU 04) 14-17 September 2004, Nara, Japan **  |
| {{preprints:2004:ttp04-26.pdf|PDF}} {{preprints:2004:ttp04-26.ps|PostScript}}   |
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