Exclusive electro-production of pions and vector mesons at HERMES

A review is given of measurements of hard exclusive π+ production on a hydrogen target, as well as of the production of exclusive π+π− pairs and light vector mesons on hydrogen and deuterium targets at HERMES using the 27.6 GeV HERA positron beam. First preliminary results for the unpolarized total π+ production cross section in the kinematic range 1.5