1. Photon Factory, National Laboratory for High Energy Physics, Oho 1-1, Tsukuba-shi, Ibaraki 305
2. Faculty of Science, Tokyo Metropolitan University, Minamiohsawa 1-1, Hachiohji-shi, Tokyo 192-03
3. Faculty of Engineering, Utsunomiya University, Ishii-cho 2753, Utsunomiya-shi, 321