[1] UNIV PADUA,PADUA,ITALY
[2] IST NAZL FIS NUCL,PADUA,ITALY
[3] IN2P3,CNRS,LAPP,ANNECY LE VIEUX,FRANCE
[4] BUDKER INST NUCL PHYS,NOVOSIBIRSK 630090,RUSSIA
[5] UNIV ROMA LA SAPIENZA,ROME,ITALY
[6] IST NAZL FIS NUCL,SEZ ROME 1,ROME,ITALY
[7] UNIV MARYLAND,COLLEGE PK,MD 20742
[8] CALTECH,PASADENA,CA 91125