Phys. Rev. D
39,
3524–3527
(1989)
Search for a fourth-generation quark with ‖Q‖=e/3 in e+e- collisions at √s =56–57 GeV
K. Abe et al.
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K. Abe, K. Amako, Y. Arai, Y. Asano, M. Chiba, Y. Chiba, M. Daigo, T. Emura, I. Endo, M. Fukawa, T. Fukui, Y. Fukushima, J. Haba, D. Haidt, I. Hayashibara, Y. Hemmi, M. Higuchi, T. Hirose, Y. Hojyo, Y. Homma, Y. Hoshi, Y. Ikegami, N. Ishihara, T. Kamitani, N. Kanematsu, J. Kanzaki, R. Kikuchi, T. Kondo, T. Koseki, H. Kurashige, T. Matsui, M. Minami, K. Miyake, S. Mori, Y. Nagashima, T. Nakamura, I. Nakano, Y. Narita, S. Odaka, K. Ogawa, T. Ohama, T. Ohsugi, A. Okamoto, A. Ono, H. Osabe, T. Oyama, H. Saito, H. Sakae, H. Sakamoto, S. Sakamoto, M. Sakano, M. Sakuda, N. Sasao, M. Sato, M. Shioden, J. Shirai, S. Sugimoto, T. Sumiyoshi, Y. Suzuki, Y. Takada, F. Takasaki, A. Taketani, N. Tamura, R. Tanaka, N. Terunuma, K. Tobimatsu, T. Tsuboyama, A. Tsukamoto, S. Uehara, Y. Unno, M. Utsumi, M. Wakai, T. Watanabe, Y. Watase, Y. Yamada, T. Yamagata, T. Yamashita, Y. Yonezawa, and H. Yoshida
Department of Physics, Tohoku University, Sendai 980, Japan
KEK, National Laboratory for High Energy Physics, Tsukuba 305, Japan
Institute of Applied Physics, University of Tsukuba, Tsukuba 305, Japan
Department of Physics, Tokyo Metropolitan University, Tokyo 158, Japan
Department of Physics, Hiroshima University, Hiroshima 730, Japan
Wakayama Medical College, Wakayama 649-63, Japan
Faculty of Engineering, Tokyo University of Agriculture and Technology, Koganei 184, Japan
Department of Physics, Osaka University, Toyonaka 560, Japan
Department of Physics, Kyoto University, Kyoto 606, Japan
Department of Applied Physics, Tohoku-Gakuin University, Tagajo 985, Japan
Graduate School of Science and Technology, Kobe University, Kobe 657, Japan
School of Allied Medical Science, Kobe University, Kobe 654-01, Japan Institute of Physics, University of Tsukuba, Tsukuba 305, Japan
College of Liberal Arts, Kobe University, Kobe 657, Japan
Faculty of Engineering, Miyazaki University, Miyazaki 889-21, Japan
Department of Electronic and Computer Engineering, Ibaraki College of Technology, Ibaraki 312, Japan
Faculty of General Education, Meiji-Gakuin University, Yokohama 244, Japan
Faculty of Engineering, Fukui University, Fukui 910, Japan;
Received 23 December 1988; published in the issue dated 1 June 1989
A search for a fourth-generation quark with ‖Q‖=e/3 has been made with the VENUS detector at the KEK e+e- collider TRISTAN. Multihadron events with a spherical shape or containing isolated leptons were studied. There is no evidence for an excess production of such events in e+e- collision at √s =56–57 GeV and a lower limit on the mass is 27.5 GeV/c2 at the 95% C.L.
© 1989 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.39.3524
DOI:
10.1103/PhysRevD.39.3524
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