[1] Univ Tokyo, Inst Cosm Ray Res, Kamioka Observ, Gifu 5061205, Japan
[2] Univ Tokyo, Inst Cosm Ray Res, Res Ctr Cosm Neutrinos, Kashiwa, Chiba 2778582, Japan
[3] Boston Univ, Dept Phys, Boston, MA 02215 USA
[4] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA
[5] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
[6] Calif State Univ Dominguez Hills, Dept Phys, Carson, CA 90747 USA
[7] Chonnam Natl Univ, Dept Phys, Kwangju 500757, South Korea
[8] Duke Univ, Dept Phys, Durham, NC 27708 USA
[9] George Mason Univ, Dept Phys, Fairfax, VA 22030 USA
[10] Gifu Univ, Dept Phys, Gifu 5011193, Japan
[11] Univ Hawaii, Dept Phys & Astron, Honolulu, HI 96822 USA
[12] Indiana Univ, Dept Phys, Bloomington, IN 47405 USA
[13] KEK, High Energy Accelerator Res Org, Tsukuba, Ibaraki 3050801, Japan
[14] Kobe Univ, Dept Phys, Kobe, Hyogo 6578501, Japan
[15] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan
[16] Los Alamos Natl Lab, Div Phys, Los Alamos, NM 87544 USA
[17] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA
[18] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
[19] MIT, Dept Phys, Cambridge, MA 02139 USA
[20] Univ Minnesota, Dept Phys, Duluth, MN 55812 USA
[21] Miyagi Univ Educ, Dept Phys, Sendai, Miyagi 9800845, Japan
[22] Nagoya Univ, Dept Phys, Nagoya, Aichi 4648602, Japan
[23] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA
[24] Niigata Univ, Dept Phys, Niigata 9502181, Japan
[25] Osaka Univ, Dept Phys, Toyonaka, Osaka 5600043, Japan
[26] Okayama Univ, Dept Phys, Okayama 7008530, Japan
[27] Seoul Natl Univ, Dept Phys, Seoul 151742, South Korea
[28] Shizuoka Seika Coll, Shizuoka 4258611, Japan
[29] Shizuoka Univ, Dept Syst Engn, Hamamatsu, Shizuoka 4328561, Japan
[30] Sungkyunkwan Univ, Dept Phys, Suwon 440746, South Korea
[31] Tohoku Univ, Res Ctr Neutrino Sci, Sendai, Miyagi 9808578, Japan
[32] Univ Tokyo, Bunkyo Ku, Tokyo 1130033, Japan
[33] Tokai Univ, Dept Phys, Hiratsuka, Kanagawa 2591292, Japan
[34] Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1528551, Japan
[35] Warsaw Univ, Inst Expt Phys, PL-00681 Warsaw, Poland
[36] Univ Washington, Dept Phys, Seattle, WA 98195 USA