[1] Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan
[2] Boston Univ, Dept Phys, Boston, MA 02215 USA
[3] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA
[4] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
[5] Calif State Univ Dominguez Hills, Dept Phys, Carson, CA 90747 USA
[6] George Mason Univ, Dept Phys, Fairfax, VA 22030 USA
[7] Gifu Univ, Dept Phys, Gifu 5011193, Japan
[8] Univ Hawaii, Dept Phys & Astron, Honolulu, HI 96822 USA
[9] High Energy Accelerator Res Org, Inst Particle & Nucl Studies, Tsukuba, Ibaraki 3050801, Japan
[10] Kobe Univ, Dept Phys, Kobe, Hyogo 6578501, Japan
[11] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan
[12] Univ Calif Los Alamos Natl Lab, Div Phys, Los Alamos, NM 87544 USA
[13] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA
[14] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
[15] Univ Minnesota, Dept Phys, Duluth, MN 55812 USA
[16] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA
[17] Niigata Univ, Dept Phys, Niigata 9502181, Japan
[18] Osaka Univ, Dept Phys, Toyonaka, Osaka 5600043, Japan
[19] Seoul Natl Univ, Dept Phys, Seoul 151742, South Korea
[20] Shizuoka Seika Coll, Shizuoka 4258611, Japan
[21] Shizuoka Univ, Dept Syst Engn, Shizuoka 4328561, Japan
[22] Tohoku Univ, Res Ctr Neutrino Sci, Sendai, Miyagi 9808578, Japan
[23] Univ Tokyo, Tokyo 1130033, Japan
[24] Tokai Univ, Dept Phys, Hiratsuka, Kanagawa 2591292, Japan
[25] Tokyo Inst Technol, Dept Phys, Tokyo 1528551, Japan
[26] Univ Warsaw, Inst Expt Phys, PL-00681 Warsaw, Poland
[27] Univ Washington, Dept Phys, Seattle, WA 98195 USA