[1] Univ Cagliari, Dipartimento Fis, I-09100 Cagliari, Italy
[2] Ist Nazl Fis Nucl, Sez Cagliari, I-09100 Cagliari, Italy
[3] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England
[4] CERN, CH-1211 Geneva 23, Switzerland
[5] Joint Inst Nucl Res, Dubna, Russia
[6] Univ Edinburgh, Dept Phys & Astron, Edinburgh EH9 3JZ, Midlothian, Scotland
[7] Univ Ferrara, Dipartimento Fis, I-44100 Ferrara, Italy
[8] Ist Nazl Fis Nucl, Sez Ferrara, I-44100 Ferrara, Italy
[9] Univ Florence, Dipartimento Fis, I-50125 Florence, Italy
[10] Ist Nazl Fis Nucl, Sez Firenze, I-50125 Florence, Italy
[11] Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany
[12] Univ Paris 11, Lab Accelerateur Lineaire, CNRS, IN2P3, F-91406 Orsay, France
[13] Univ Perugia, Dipartimento Fis, I-06100 Perugia, Italy
[14] Ist Nazl Fis Nucl, Sez Perugia, I-06100 Perugia, Italy
[15] Univ Pisa, Dipartimento Fis, I-56100 Pisa, Italy
[16] Scuola Normale Super Pisa, I-56100 Pisa, Italy
[17] Ist Nazl Fis Nucl, Sez Pisa, I-56100 Pisa, Italy
[18] CEA Saclay, DAPNIA, DSM, F-91191 Gif Sur Yvette, France
[19] Univ Siegen, Fachbereich Phys, D-57068 Siegen, Germany
[20] Univ Turin, Dipartimento Fis Sperimentale, I-10125 Turin, Italy
[21] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy
[22] Soltan Inst Nucl Studies, High Energy Phys Lab, PL-00681 Warsaw, Poland
[23] Austrian Acad Sci, Inst Hochenergiephys, A-1050 Vienna, Austria
[24] Univ Bologna, Dipartimento Fis, I-40126 Bologna, Italy
[25] Ist Nazl Fis Nucl, Sez Bologna, I-40126 Bologna, Italy
[26] Univ Modena, Dipartimento Fis, I-41100 Modena, Italy
[27] Univ Los Andes, Dept Fis, Merida 5101A, Venezuela