[1] Univ Pavia, Dipartimento Fis Nucl & Teor, Via Bassi 6, I-27100 Pavia, Italy
[2] Univ Wroclaw, Inst Theoret Phys, PL-50138 Wroclaw, Poland
[3] Univ Aquila, Dipartimento Fis, I-67100 Laquila, Italy
[4] Ist Nazl Fis Nucl, Laquila, Italy
[5] Ist Nazl Fis Nucl, LNGS, Assergi, Italy
[6] ETH Honggerberg, Inst Particle Phys, CH-8093 Zurich, Switzerland
[7] Univ Padua, Dipartimento Fis, Padua, Italy
[8] Ist Nazl Fis Nucl, Padua, Italy
[9] Univ Milan, Dipartimento Fis, Milan, Italy
[10] Ist Nazl Fis Nucl, Milan, Italy
[11] Univ Pavia, Dipartimento Fis Nucl & Teor, I-27100 Pavia, Italy
[12] Ist Nazl Fis Nucl, Dipartimento Fis Nucl & Teor, I-27100 Pavia, Italy
[13] Univ Granada, Dept Fis Teor & Cosmos, E-18071 Granada, Spain
[14] Univ Granada, Ctr Andaluz Fis Particulas Elementales, E-18071 Granada, Spain
[15] Univ Naples Federico II, Dipartimento Sci Fis, Naples, Italy
[16] Ist Nazl Fis Nucl, I-80125 Naples, Italy
[17] CERN, Geneva, Switzerland
[18] Politecn Milan, Dipartimento Ingn Nucl, Milan, Italy
[19] Ist Nazl Fis Nucl, Milan, Italy
[20] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90024 USA
[21] H Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland
[22] CIEMAT, Dept Invest Basica, Madrid, Spain
[23] Silesian Univ, Inst Phys, PL-40007 Katowice, Poland
[24] Univ Warsaw, Inst Phys Expt, PL-00325 Warsaw, Poland
[25] A Soltan Inst Nucl Studies, Warsaw, Poland
[26] Ist Nazl Fis Nucl, Nazl Frascati Lab, I-00044 Frascati, Italy
[27] AGH Univ Sci & Technol, Dept Elect, Krakow, Poland
[28] INFN, Pisa, Italy
[29] Univ Warsaw, Inst Radioelect, Warsaw, Poland