Hard Meson Electroproduction And Twist-3 Effects

We analyze light meson electroproduction within the handbag model. We study cross sections and spin asymmetries for various mesons. The essential role of the transversity ${\tilde{H}}_T$ and ${\tilde{E}}_T$ GPDs in electroproduction of pseudoscalar mesons is found. Our results are in good agrement with experiment.