1. Department of Physics, Kyoto University, Kyoto, Kyoto 606-8502, Japan
2. Kamioka Observatory, Institute for Cosmic Ray Research, University of Tokyo, Kamioka, Gifu 506-1205, Japan
3. Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study,University of Tokyo, Kashiwa, Chiba 277-8583, Japan
4. Research Center for Cosmic Neutrinos, Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba 277-8582, Japan
5. Department of Theoretical Physics, University Autonoma Madrid, 28049 Madrid, Spain
6. Department of Physics, Boston University, Boston, MA 02215, USA
7. Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, V6T1Z4, Canada
8. Department of Physics and Astronomy, University of California, Irvine, Irvine, CA 92697-4575, USA
9. Department of Physics and Astronomy, UCLA, CA 90095-1547, USA
10. Department of Physics, California State University, Dominguez Hills, Carson, CA 90747, USA
11. Department of Physics, Chonnam National University, Kwangju 500-757, Korea
12. Department of Physics, Duke University, Durham NC 27708, USA
13. Ecole Polytechnique, IN2P3-CNRS, Laboratoire Leprince-Ringuet, F-91120 Palaiseau, France
14. Junior College, Fukuoka Institute of Technology, Fukuoka, Fukuoka 811-0295, Japan
15. Department of Physics, Gifu University, Gifu, Gifu 501-1193, Japan
16. GIST College, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea
17. Department of Physics and Astronomy, University of Hawaii, Honolulu, HI 96822, USA
18. Department of Physics, Imperial College London, London, SW7 2AZ, United Kingdom
19. Dipartimento Interuniversitario di Fisica, INFN Sezione di Bari and Università e Politecnico di Bari, I-70125, Bari, Italy
20. Dipartimento di Fisica, INFN Sezione di Napoli and Università di Napoli, I-80126, Napoli, Italy
21. Dipartimento di Fisica, INFN Sezione di Padova and Università di Padova, I-35131, Padova, Italy
22. INFN Sezione di Roma and Università di Roma “La Sapienza”, I-00185, Roma, Italy
23. High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
24. Department of Physics, Kobe University, Kobe, Hyogo 657-8501, Japan
25. Department of Physics, University of Liverpool, Liverpool, L69 7ZE, United Kingdom
26. Department of Physics, Miyagi University of Education, Sendai, Miyagi 980-0845, Japan
27. Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Aichi 464-8602, Japan
28. Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University, Nagoya, Aichi 464-8602, Japan
29. National Centre For Nuclear Research, 00-681 Warsaw, Poland
30. Department of Physics and Astronomy, State University of New York at Stony Brook, NY 11794-3800, USA
31. BMCC/CUNY, Science Department, NewYork, NewYork 10007, USA
32. Department of Physics, Okayama University, Okayama, Okayama 700-8530, Japan
33. Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
34. Department of Physics, Oxford University, Oxford, OX1 3PU, United Kingdom
35. STFC, Rutherford Appleton Laboratory, Harwell Oxford, and Daresbury Laboratory, Warrington, OX11 0QX, United Kingdom
36. School of Physics and Astronomy, Queen Mary University of London, London, E1 4NS, United Kingdom
37. TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T2A3, Canada
38. Department of Physics, University of Regina, 3737 Wascana Parkway, Regina, SK, S4SOA2, Canada
39. Department of Physics, Seoul National University, Seoul 151-742, Korea
40. Department of Physics and Astronomy, University of Sheffield, S3 7RH, Sheffield, United Kingdom
41. Department of Informatics in Social Welfare, Shizuoka University of Welfare, Yaizu, Shizuoka, 425-8611, Japan
42. Department of Physics, Sungkyunkwan University, Suwon 440-746, Korea
43. Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan
44. The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
45. Department of Physics, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
46. Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
47. Department of Physics, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba 278-8510, Japan
48. Department of Physics, University of Toronto, ON, M5S 1A7, Canada
49. Department of Engineering Physics, Tsinghua University, Beijing, 100084, China
50. Faculty of Engineering, Yokohama National University, Yokohama, 240-8501, Japan