Recent results from the WASA-at-COSY experiment

WASA is a 4π multidetector system for studies of light meson production and decays in light ion collisions at the COSY storage ring. The facility allows the detection of both photons and charged particles and it is equipped with an internal hydrogen pellet target. The primary objectives of the experimental program are studies of symmetry breaking patterns in η and η'-decays and in meson production reactions. Additional objectives include searches and further investigations of specific hadronic bound systems. Since the startup of the routine operation in 2007 WASA-at-COSY has collected data for about 18 weeks. The experiments involve studies of η meson decays, isospin violation in the dd→απ0 reaction, studies of the ABC effect and searches for bound states of η and light nuclei. For example, a recent six week run period in autumn 2008 was devoted to the studies of the η meson decays and a data sample of a few times 107 tagged events were collected. I give an overview of the main WASA-at-COSY activities and present some preliminary results.