[1] UNIV BOLOGNA, I-40126 BOLOGNA, ITALY
[2] INFN, BOLOGNA, ITALY
[3] BROWN UNIV, PROVIDENCE, RI 02912 USA
[4] UNIV ESTADUAL CAMPINAS, BR-13100 CAMPINAS, SP, BRAZIL
[5] CERN, CH-1211 GENEVA 23, SWITZERLAND
[6] CHINESE ACAD SCI, BEIJING, PEOPLES R CHINA
[7] ICSC, WORLD LAB, BEIJING, PEOPLES R CHINA
[8] INFN, LNGS, ASSERGI, ITALY
[9] INFN, FLORENCE, ITALY
[10] UNIV FLORENCE, I-50121 FLORENCE, ITALY
[11] INFN, LNF, FRASCATI, ITALY
[12] UNIV HOUSTON, HOUSTON, TX 77004 USA
[13] INDIANA UNIV, BLOOMINGTON, IN 47401 USA
[14] MIT, CAMBRIDGE, MA 02139 USA
[15] NORTHEASTERN UNIV, BOSTON, MA 02115 USA
[16] RUSSIAN ACAD SCI, INR, MOSCOW, RUSSIA
[17] OKAYAMA UNIV, OKAYAMA 700, JAPAN
[18] OKAYAMA UNIV SCI, OKAYAMA, JAPAN
[19] UNIV PERUGIA, I-06100 PERUGIA, ITALY
[20] INFN, PERUGIA, ITALY
[21] SAITAMA UNIV, URAWA, SAITAMA 338, JAPAN
[22] ASHIKAGA INST TECHNOL, ASHIKAGA, JAPAN
[23] CNR, INST COSMO GEOPHY, TURIN, ITALY
[24] UNIV TURIN, I-10124 TURIN, ITALY
[25] INFN, TURIN, ITALY
[26] UNIV URBINO, I-61029 URBINO, ITALY