[1] RHEIN WESTFAL TH AACHEN, PHYS INST 3, AACHEN, FED REP GER
[2] UNIV LIBRE BRUSSELS, INTER UNIV INST HIGH ENERGIES, BRUSSELS, BELGIUM
[3] CERN, GENEVA, SWITZERLAND
[4] ECOLE POLYTECH, PALAISEAU, FRANCE
[5] IST FIS, MILAN, ITALY
[6] JNFN, MILAN, ITALY
[7] UNIV OXFORD, DEPT NUCL PHYS, OXFORD, ENGLAND
[8] UCL, LONDON, ENGLAND