[1] IST NAZL FIS NUCL,SEZ SANITA,I-00161 ROME,ITALY
[2] UNIV MILAN,DIPARTIMENTO FIS,MILAN,ITALY
[3] IST NAZL FIS NUCL,I-20133 MILAN,ITALY
[4] LPC,COLL FRANCE,IN2P3,CNRS,PARIS,FRANCE
[5] UNIV PARIS 06,LPNHE,F-75252 PARIS,FRANCE
[6] UNIV PARIS 07,LPNHE,F-75252 PARIS,FRANCE
[7] IN2P3,CNRS,STRASBOURG,FRANCE
[8] UNIV WUPPERTAL,WUPPERTAL,GERMANY
[9] UNIV UPPSALA,DEPT RADIAT SCI,S-75105 UPPSALA,SWEDEN
[10] COMENIUS UNIV BRATISLAVA,BRATISLAVA,SLOVAKIA
[11] JOZEF STEFAN INST,LJUBLJANA,SLOVENIA
[12] CPPM,IN2P3,CNRS,MARSEILLE,FRANCE
[13] OSTERR AKAD WISSENSCH,INST HOCHENERGIEPHYS,VIENNA,AUSTRIA
[14] ACAD SCI CZECH REPUBL,INST PHYS,PRAGUE,CZECH REPUBLIC
[15] CHARLES UNIV,FAC MATH & PHYS,PRAGUE,CZECH REPUBLIC
[16] CERN,CH-1211 GENEVA,SWITZERLAND
[17] IST NAZL FIS NUCL,PADUA,ITALY
[18] UNIV GRENOBLE 1,INST NUCL SCI,IN2P3,CNRS,GRENOBLE,FRANCE