Bartol Research Institute, University of Delaware, Newark, DE 19716, USA
(2) Fachbereich 8 Physik, BUGH Wuppertal, D-42097 Wuppertal, Germany
(3) Université Libre de Bruxelles, Science Faculty, CP230, B-1050 Brussels, Belgium
(4) DESY-Zeuthen, D-15735 Zeuthen, Germany
(5) Blackett Laboratory, Imperial College, London SW7 2BW, UK
(6) Dept. of Technology, Kalmar University, S-39182 Kalmar, Sweden
(7) Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
(8) Dept. of Physics, Pennsylvania State University, University Park, PA 16802, USA
(9) Dept. of Physics, University of California, Berkeley, CA 94720, USA
(10) Dept. of Physics and Astronomy, University of California, Irvine, CA 92697, USA
(11) Institute of Physics, University of Mainz, D-55099 Mainz, Germany
(12) Dept. of Physics, University of Maryland, College Park, MD 20742, USA
(13) University of Mons-Hainaut, 7000 Mons, Belgium
(14) Departamento de Física, Universidad Simón Bolívar, Caracas, 1080 Venezuela
(15) Dept. of Physics, University of Wisconsin, Madison, WI 53706, USA
(16) Physics Dept., University of Wisconsin, River Falls, WI 54022, USA
(17) Division of High Energy Physics, Uppsala University, S-75121 Uppsala, Sweden
(18) Dept. of Physics, Stockholm University, SE-10691 Stockholm, Sweden
(19) Vrije Universiteit Brussel, Dienst ELEM, B-1050 Brussel, Belgium
References
1. J. Ahrens et al., astro-ph/0305196