[1] Univ Tokyo, Inst Cosm Ray Res, Kamioka Observ, Gifu 5061205, Japan
[2] Univ Tokyo, Inst Phys & Math Universe IPMU, Kashiwa, Chiba 2778583, Japan
[3] Univ Tokyo, Inst Cosm Ray Res, Res Ctr Cosm Neutrinos, Kashiwa, Chiba 2778582, Japan
[4] Boston Univ, Dept Phys, Boston, MA 02215 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] Fukuoka Inst Technol, Jr Coll, Fukuoka 8110214, Japan
[10] Gifu Univ, Dept Phys, Gifu 5011193, Japan
[11] Univ Hawaii, Dept Phys & Astron, Honolulu, HI 96822 USA
[12] High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki 3050801, Japan
[13] Kobe Univ, Dept Phys, Kobe, Hyogo 6578501, Japan
[14] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan
[15] Univ Autonoma Madrid, Dept Theoret Phys, E-28049 Madrid, Spain
[16] Miyagi Univ Educ, Dept Phys, Sendai, Miyagi 9800845, Japan
[17] Nagoya Univ, Solar Terr Environm Lab, Nagoya, Aichi 4648602, Japan
[18] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA
[19] Okayama Univ, Dept Phys, Okayama 7008530, Japan
[20] Osaka Univ, Dept Phys, Toyonaka, Osaka 5600043, Japan
[21] Seoul Natl Univ, Dept Phys, Seoul 151742, South Korea
[22] Shizuoka Univ Welf, Dept Informat Social Welf, Shizuoka 4258611, Japan
[23] Sungkyunlcwan Univ, Dept Phys, Suwon 440746, South Korea
[24] Tokai Univ, Dept Phys, Hiratsuka, Kanagawa 2591292, Japan
[25] Univ Tokyo, Tokyo 1130033, Japan
[26] Tsinghua Univ, Dept Engn Phys, Beijing 100084, Peoples R China
[27] Warsaw Univ, Inst Expt Phys, PL-00681 Warsaw, Poland
[28] Univ Washington, Dept Phys, Seattle, WA 98195 USA