The COMPASS-II program

The COMPASS experiment at CERN uses either muon or hadron beams with a longitudinally or transversely polarized solid target, liquid hydrogen or heavy nuclear targets for study of hadron structure and hadron spectroscopy. The COMPASS Collaboration has recently submitted a proposal for additional measurements in the next years and the proposal was approved by the CERN Research Board. The proposal consists of three main parts: 1) nucleon structure study via Drell- Yan process using a negative pion beam and transversely polarized proton target 2) nucleon structure study in exclusive positive and negative muon beam scattering off the unpolarized proton target 3) test of the chiral perturbative theory predictions via reactions of Primakoff scattering using hadron beam.