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

Koji Abe, K. Amako, Y. Arai,Mineo Fukawa,Yasutaka Fukushima,Nobuhiro Ishihara, D. Haidt,Junichi Kanzaki, T. Kondo, T. Matsui,Shigeru Odaka, K. Ogawa,Taro Ohama,Hiroshi Sakamoto, J. Shirai, T. Sumiyoshi,Fumihiko Takasaki,Toru Tsuboyama, S. Uehara,Yoshinobu Unno,Yoshiyuki Watase, Y. Yamada, Y. Asano, T. Koseki,Shigeki Mori, M. Sakano, Y. Takada,Yasushige Yonezawa,Masami Chiba,Toru Fukui,Tachishige Hirose,Y. Narita, T. Oyama, M. Utsumi, M. Minami, H. Saito, M. Wakai, T. Watanabe, T. Yamagata,Y. Chiba,Ichita Endo, I. Hayashibara, T. Ohsugi, A. Taketani,R. Tanaka,N. Terunuma,Motomasa Daigo,Tsuneo Emura,J. Haba, T. Kamitani,Nobuyuki Kanematsu,Y. Nagashima, H. Osabe, S. Sakamoto, S. Sugimoto,Yoshishige Suzuki,A. Tsukamoto, T. Yamashita,Yasuo Hemmi,Ryusaburo Kikuchi,Hisaya Kurashige,Kozo Miyake, A. Okamoto, N. Sasao, N. Tamura,Masato Higuchi, Y. Hoshi, M. Sato, Y. Hojyo, H. Sakae,Yasuhiro Homma, Y. Ikegami, I. Nakano, A. Ono,Teruo Nakamura, M. Shioden, K. Tobimatsu, H. Yoshida

European Physical Journal C（1989）

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摘要

Differential cross sections fore + e −→γγ have been measured at center-of-mass energies of 55, 56, 56.5 and 57 GeV. The results are in good agreement with those predicted by QED. Possible deviations from QED are studied in terms of contact interactions, and the limits on compositeness scales are obtained. Using events with a gramma pair in the final state, a search is made for the pair production of unstable photons, $$e^ + e^ - \to \tilde \gamma \tilde \gamma $$ . No candidate events were found and a new limit on the photino mass is obtained.

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