[1] Univ Aquila, Gran Sasso Sci Inst, I-67100 Laquila, Italy
[2] Tech Univ Munich, Phys Dept & Excellence Cluster Universe, D-85748 Garching, Germany
[3] Kurchatov Inst, Natl Res Ctr, Moscow 123182, Russia
[4] Forschungszentrum Julich, Inst Kernphys, D-52425 Julich, Germany
[5] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy
[6] Ist Nazl Fis Nucl, I-20133 Milan, Italy
[7] Princeton Univ, Chem Engn Dept, Princeton, NJ 08544 USA
[8] Univ Hamburg, Inst Expt Phys, D-22761 Hamburg, Germany
[9] Ist Nazl Fis Nucl, Lab Nazl Gran Sasso, I-67010 Assergi, AQ, Italy
[10] Virginia Polytech Inst & State Univ, Phys Dept, Blacksburg, VA 24061 USA
[11] Princeton Univ, Phys Dept, Princeton, NJ 08544 USA
[12] Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy
[13] Ist Nazl Fis Nucl, I-16146 Genoa, Italy
[14] Moscow MV Lomonosov State Univ, Skobeltsyn Inst Nucl Phys, Moscow 119234, Russia
[15] Univ Hawaii, Dept Phys & Astron, Honolulu, HI 96822 USA
[16] NRC Kurchatov Inst, St Petersburg Nucl Phys Inst, Gatchina 188350, Russia
[17] Joint Inst Nucl Res, Dubna 141980, Russia
[18] Moscow MV Lomonosov State Univ, Phys Dept, Moscow 119234, Russia
[19] Univ Paris Diderot, CNRS, IN2P3,Observ Paris, CEA IRFU,Astroparticule & Cosmol,Sorbonne Paris C, F-75205 Paris 13, France
[20] Univ Houston, Dept Phys, Houston, TX 77204 USA
[21] Jagiellonian Univ, M Smoluchowski Inst Phys, PL-30348 Krakow, Poland
[22] Kiev Inst Nucl Res, UA-03028 Kiev, Ukraine
[23] Natl Res Nucl Univ MEPhI, Moscow Engn Phys Inst, Moscow 115409, Russia
[24] Rhein Westfal TH Aachen, D-52062 Aachen, Germany
[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] Ist Nazl Fis Nucl, I-06123 Perugia, Italy
[29] Univ Massachusetts, Amherst Ctr Fundamental Interact, Amherst, MA 01003 USA
[30] Univ Massachusetts, Phys Dept, Amherst, MA 01003 USA
[31] Univ Calif Los Angeles, Phys & Astron Dept, Los Angeles, CA 90095 USA
[32] Lab Subterraneo Canfranc, Paseo Ayerbe S-N, Canfranc Estn Huesca 22880, Spain
[33] Univ Calif San Diego, Phys Dept, San Diego, CA 92093 USA