[1] CERN, CH-1211 Geneva, Switzerland
[2] LIP, P-1000 Lisbon, Portugal
[3] Vilnius State Univ, Inst Mat Sci & Appl Res, LT-2040 Vilnius, Lithuania
[4] Univ Naples Federico II, Dipartimento Fis, I-80125 Naples, Italy
[5] Ist Nazl Fis Nucl, I-80125 Naples, Italy
[6] Univ Karlsruhe, IEKP, D-76128 Karlsruhe, Germany
[7] Univ Florence, Dipartimento Energet, I-50139 Florence, Italy
[8] Univ Bern, Lab Hochenergiephys, CH-3012 Bern, Switzerland
[9] Brookhaven Natl Lab, Upton, NY 11973 USA
[10] Jozef Stefan Inst, Exp Particle Phys Dep, Ljubljana 1001, Slovenia
[11] Russian Acad Sci, AF Ioffe Physicotech Inst, St Petersburg 194021, Russia
[12] Brunel Univ, Uxbridge UB8 3PH, Middx, England
[13] Univ Geneva, Dept Radiol, CH-1211 Geneva, Switzerland
[14] ILK Dresden, D-01309 Dresden, Germany
[15] Univ Helsinki, Helsinki Inst Phys, FIN-00014 Helsinki, Finland
[16] Turku Univ, Wihuri Phys Lab, FI-20014 Turku, Finland
[17] Tech Univ Munich, Dept Phys, D-85748 Garching, Germany
[18] Univ Catholique Louvain, B-1348 Louvain, Belgium
[19] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland