[1] CIEMAT, E-28040 Madrid, Spain
[2] Rhein Westfal TH Aachen, Inst Phys 1, D-52056 Aachen, Germany
[3] Rhein Westfal TH Aachen, Inst Phys 3, D-52056 Aachen, Germany
[4] Lab Annecy Le Vieux Phys Particules, LAPP, F-74941 Annecy Le Vieux, France
[5] Louisiana State Univ, Baton Rouge, LA 70803 USA
[6] Johns Hopkins Univ, Baltimore, MD 21218 USA
[7] Chinese Acad Sci, Ctr Space Sci & Applicat, Beijing 100080, Peoples R China
[8] Chinese Acad Launching Vehicle Technol, CALT, Beijing 100076, Peoples R China
[9] Chinese Acad Sci, Inst High Energy Phys, Beijing 100080, Peoples R China
[10] Univ Bologna, I-40126 Bologna, Italy
[11] Ist Nazl Fis Nucl, Sez Bologna, I-40126 Bologna, Italy
[12] Politech Univ Bucharest, Inst Microbiol, R-76900 Bucharest, Romania
[13] Univ Bucharest, R-76900 Bucharest, Romania
[14] MIT, Cambridge, MA 02139 USA
[15] Natl Cent Univ, Chungli 32054, Taiwan
[16] LIP, Lab Instrumentacao & Fis Expt Particulas, P-3000 Coimbra, Portugal
[17] Univ Maryland, College Pk, MD 20742 USA
[18] Ist Nazl Fis Nucl, Sez Firenze, I-50125 Florence, Italy
[19] Max Planck Inst Extraterr Phys, D-85740 Garching, Germany
[20] Univ Geneva, CH-1211 Geneva 4, Switzerland
[21] Inst Nucl Sci, F-38026 Grenoble, France
[22] Helsinki Univ Technol, FIN-02540 Kylmala, Finland
[23] Inst Super Tecn, P-1096 Lisbon, Portugal
[24] LIP, Lab Instrumentacao & Fis Expt Particulas, P-1000 Lisbon, Portugal
[25] Chung Shan Inst Sci & Technol, Lungtan 11529, Taiwan
[26] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy
[27] IV Kurchatov Atom Energy Inst, Moscow 123182, Russia
[28] Inst Theoret & Expt Phys, Moscow 117259, Russia
[29] Ist Nazl Fis Nucl, Sez Perugia, I-06100 Perugia, Italy
[30] Univ Perugia, I-06100 Perugia, Italy
[31] Acad Sinica, Taipei 115, Taiwan
[32] Kyungpook Natl Univ, Taegu 702701, South Korea
[33] Univ Turku, FIN-20014 Turku, Finland
[34] ETH Zurich, CH-8093 Zurich, Switzerland
[35] Inst Phys Nucl, St Petersburg, Russia