[1] Columbia Univ, Dept Phys, 538 W 120th St, New York, NY 10027 USA
[2] Nikhef & Univ Amsterdam, Sci Pk, Amsterdam, Netherlands
[3] Ist Nazl Fis Nucl, Lab Nazl Gran Sasso, Laquila, Italy
[4] Gran Sasso Sci Inst, Laquila, Italy
[5] Univ Bologna, Dept Phys & Astrophys, Bologna, Italy
[6] Ist Nazl Fis Nucl, Bologna, Italy
[7] Johannes Gutenberg Univ Mainz, PRISMA, Inst Phys & Exzellenzcluster, Mainz, Germany
[8] Univ Coimbra, Dept Phys, Coimbra, Portugal
[9] New York Univ Abu Dhabi, Abu Dhabi, U Arab Emirates
[10] Univ Zurich, Phys Inst, Zurich, Switzerland
[11] Stockholm Univ, Dept Phys, Oskar Klein Ctr, SE-10691 Stockholm, Sweden
[12] Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY USA
[13] Max Planck Inst Kernphys, Heidelberg, Germany
[14] Weizmann Inst Sci, Dept Particle Phys & Astrophys, Rehovot, Israel
[15] Univ Bern, Albert Einstein Ctr Fundamental Phys, Bern, Switzerland
[16] Purdue Univ, Dept Phys & Astron, W Lafayette, IN USA
[17] Univ Nantes, CNRS, SUBATECH, Ecole Mines Nantes,In2p3, Nantes, France
[18] Univ Calif San Diego, Dept Phys, San Diego, CA 92103 USA
[19] Wilhelms Univ Munster, Inst Kernphys, Munster, Germany
[20] Ist Nazl Fis Nucl, Turin, Italy
[21] Osservatorio Astrofis Torino, Turin, Italy
[22] Rice Univ, Dept Phys & Astron, Houston, TX USA
[23] Coimbra Engn Inst, Coimbra, Portugal
[24] Univ Valencia, IFIC, CSIC, Valencia, Spain