Measurement of the differential cross sections of e+e-→γγ and e+e-→γγγ at {Mathematical expression} and 57 GeV and search for unstable photino pair production

K. Abe, K. Amako, Y. Arai, M. Fukawa, Y. Fukushima, N. Ishihara, D. Haidt, J. Kanzaki, T. Kondo, T. Matsui, S. Odaka, K. Ogawa, T. Ohama, H. Sakamoto, J. Shirai, T. Sumiyoshi, F. Takasaki, T. Tsuboyama, S. Uehara, Y. UnnoY. Watase, Y. Yamada, Y. Asano, T. Koseki, S. Mori, M. Sakano, Y. Takada, Y. Yonezawa, M. Chiba, T. Fukui, T. Hirose, Y. Narita, T. Oyama, M. Utsumi, M. Minami, H. Saito, M. Minami, M. Wakai, T. Watanabe, T. Yamagata, Y. Chiba, I. Endo, I. Hayashibara, T. Ohsugi, A. Taketani, R. Tanaka, N. Terunuma, M. Daigo, T. Emura, J. Haba, T. Kamitani, N. Kanematsu, Y. Nagashima, H. Osabe, S. Sakamoto, S. Sugimoto, Y. Suzuki, A. Tsukamoto, T. Yamashita, Y. Hemmi, R. Kikuchi, H. Kurashige, K. Miyake, A. Okamoto, N. Sasao, N. Tamura, M. Higuchi, Y. Hoshi, M. Sato, Y. Hojyo, H. Sakae, Y. Homma, Y. Ikegami, I. Nakano, A. Ono, T. Nakamura, M. Shioden, K. Tobimatsu, H. Yoshida

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