From theoretical analyses of the hadronic interactions a more complex picture, however, emerges. Commonly, a changed in-medium spectral function is predicted. Vector mesons, due to their coupling to the dielectron decay channels, allow a direct measurement of their spectral functions. In addition, several electromagnetic formfactors, less precise known up to now, can be measured. A long-term physical programme is envisaged with several beams, including the pion beam, bombarding various targets thus aiming at a wide systematic investigation.
Proposals supplementing hadron measurements like kaons and anti-kaons are under consideration.
In the detector laboratory the drift chambers of the third plane are designed, constructed and built up. The drift chambers, arranged as hexagon, will be installed behind the superconducting magnet and it is important for an exact tracking of charged particles.