A search for excited electrons in the e+e− reactions up to the √s of 56 GeV

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

Physics Letters B（1988）

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摘要

Abstract Excited electrons, e ∗' s, have been searched for by making use of the processes e + e − →e + e − γγ and e γ ( e ) (quasi-real Compton scattering). From the former process, we have obtained the lower limit for the mass of e ∗' , 27.9 GeV/ c . A good agreement with QED is observed in the latter process, and new upper limits have been set for the coupling strength λ as a function of the mass of e ∗ .

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