1. Institute of Physics, Jagiellonian University, 30-348 Krakow, Poland
2. Institute for Particle Physics, Eidgenössische Technische Hochschule, CH-8093 Zürich, Switzerland
3. Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
4. Department of Physics and Astronomy, KU Leuven University, 3000 Leuven, Belguim
5. Institute of Nuclear Physics PAN, 31-342 Krakw, Poland
6. Laboratoire de Physique Corpusculaire de Caen, ENSICAEN, CNRS/IN2P3, 14050 Caen Cedex, France
7. Physikalisch Technische Bundesanstalt, 10587 Berlin, Germany