[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, PH Div, CH-1211 Geneva 23, Switzerland
[5] Joint Nucl Res Inst, 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] Univ Mainz, Inst Phys, D-55099 Mainz, Germany
[12] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA
[13] Univ Paris 11, CNRS, IN2P3, Lab Accelerateur Lineaire, F-91898 Orsay, France
[14] Univ Perugia, Dipartimento Fis, I-06100 Perugia, Italy
[15] Ist Nazl Fis Nucl, Sez Perugia, I-06100 Perugia, Italy
[16] Univ Pisa, Dipartimento Fis, I-56127 Pisa, Italy
[17] Scuola Normale Super Pisa, I-56127 Pisa, Italy
[18] Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy
[19] CEA Saclay, DSM, DAPNIA, F-91191 Gif Sur Yvette, France
[20] Univ Siegen, Fachbereich Phys, D-57068 Siegen, Germany
[21] Univ Turin, Dipartimento Fis Sperimentale, I-10125 Turin, Italy
[22] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy
[23] Soltan Inst Nucl Studies, High Energy Phys Lab, PL-00681 Warsaw, Poland
[24] Austrian Acad Sci, Inst Hochenergiephys, A-10560 Vienna, Austria