[1] Univ Aquila, Dipartimento Fis, I-67100 Laquila, Italy
[2] Ist Nazl Fis Nucl, I-67100 Laquila, Italy
[3] Ist Nazl Fis Nucl, Lab Nazl Gran Sasso, Assergi, Italy
[4] ETH Honggerberg, Inst Particle Phys, CH-8093 Zurich, Switzerland
[5] Univ Padua, Padua, Italy
[6] Ist Nazl Fis Nucl, Padua, Italy
[7] Univ Milan, Milan, Italy
[8] Ist Nazl Fis Nucl, Milan, Italy
[9] Silesian Univ, Inst Phys, PL-40007 Katowice, Poland
[10] Univ Pavia, I-27100 Pavia, Italy
[11] Ist Nazl Fis Nucl, I-27100 Pavia, Italy
[12] CERN, Geneva, Switzerland
[13] Politecn Milan, CESNEF, Milan, Italy
[14] Acad Sinica, IHEP, Beijing, Peoples R China
[15] H Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland
[16] Univ Calif Los Angeles, Dept Phys, Los Angeles, CA 90024 USA
[17] Univ Wroclaw, Inst Theoret Phys, PL-50138 Wroclaw, Poland
[18] Warsaw Univ, Inst Phys Expt, Warsaw, Poland
[19] A Soltan Inst Nucl Studies, Warsaw, Poland
[20] IFSI, Turin, Italy
[21] Univ Turin, Turin, Italy
[22] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy
[23] Univ Sci & Technol, AGH, Krakow, Poland
[24] Ist Nazl Fis Nucl, Paris, France