[1] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy
[2] INFN, I-20133 Milan, Italy
[3] Tech Univ Munich, Phys Dept, D-85748 Garching, Germany
[4] Tech Univ Munich, Excellence Cluster Universe, D-85748 Garching, Germany
[5] Natl Res Ctr Kurchatov Inst, Moscow 123182, Russia
[6] Forschungszentrum Julich, Inst Kernphys, D-52425 Julich, Germany
[7] Princeton Univ, Chem Engn Dept, Princeton, NJ 08544 USA
[8] Univ Hamburg, Inst Expt Phys, D-22761 Hamburg, Germany
[9] INFN, Lab Nazl Gran Sasso, I-67010 Assergi, Italy
[10] Princeton Univ, Phys Dept, Princeton, NJ 08544 USA
[11] Univ Genoa, Dipartimento Fis, I-16126 Genoa, Italy
[12] INFN, I-16126 Genoa, Italy
[13] Virginia Polytech Inst & State Univ, Phys Dept, Blacksburg, VA 24061 USA
[14] Lomonosov Moscow State Univ, Skobeltsyn Inst Nucl Phys, Moscow 96822, Russia
[15] Univ Hawaii, Dept Phys & Astron, Honolulu, HI 96822 USA
[16] NRC Kurchatov Inst, St Petersburg Nucl Phys, Gatchina 188350, Russia
[17] Gran Sasso Sci Inst, I-67100 Laquila, Italy
[18] Joint Inst Nucl Res, Dubna 141980, Russia
[19] Univ Paris Diderot, AstroParticule & Cosmol, CNRS, Sorbonne Paris Cite,CEA,IRFU,Observ Paris,IN2P3, F-75205 Paris 13, France
[20] Univ Tubingen, Kepler Ctr Astro & Particle Phys, D-72076 Tubingen, Germany
[21] Univ Houston, Dept Phys, Houston, TX 77204 USA
[22] Jagiellonian Univ, M Smoluchowski Inst Phys, PL-30348 Krakow, Poland
[23] Kiev Inst Nucl Res, UA-03680 Kiev, Ukraine
[24] Natl Res Nucl Univ, MEPhI Moscow Engn Phys Inst, Moscow 115409, Russia
[25] Johannes Gutenberg Univ Mainz, Inst Phys & Excellence Cluster PRISMA, D-55099 Mainz, Germany
[26] Tech Univ Dresden, Dept Phys, D-01062 Dresden, Germany
[27] Univ Perugia, Dipartimento Chim Biol & Biotecnol, I-06123 Perugia, Italy
[28] INFN, I-06123 Perugia, Italy
[29] Univ Massachusetts, Amherst Ctr Fundamental Interact, Amherst, MA 01003 USA
[30] Univ Massachusetts, Phys Dept, Amherst, MA 01003 USA