Exclusive $\rho^{0}$ and $\psi$ production from COMPASS

Preliminary results on exclusive $\rho^{0}$ and $\psi$ production from the COMPASS 2002 run are presented. The data were obtained by scattering polarized muons of 160 GeV energy on a polarized $^{6}$LiD target in the kinematic range 10$^{−3} < Q^{2} <$ 10 (GeV/c)$^{2}$ and 7.5 $< W <$ 16 GeV. The final large statistics data will allow to reduce significantly errors on both unpolarized and polarized observables for both exclusive channels. In addition, an extended range of low $Q^{2}$ will enable comprehensive studies in the region close to the photoproduction. As examples, we discuss the $t'$-dependent skewing of the two-pion invariant mass distribution and the decay angular distributions.