Experimental mass limit for a fourth-generation sequential lepton from e+e- annihilations at s=56 GeV

G. N. Kim,E. J. Kim,Dong-Chul Son, A. Bacala, R. Imlay,P. N. Kirk,Rr Mcneil,W. Metcalf,C. P. Cheng,Z. P. Mao, Y. Yan,Y. T. Xu,Y. C. Zhu, A. Abashian, K. Gotow,F. Kajino,E. H. Low, F. Naito,L. E. Piilonen, R. Childers, C. Darden,S. Lusin, C. Rosenfeld,S. Wilson,M. Frautschi, H. Kagan,R. D. Kass, C. G. Trahern,Winston Ko, R. L. Lander,Kaori Maeshima, R. L. Malchow, Smith,K. Sparks,M. C.S. Williams,Kazuo Abe,S. Chakrabarti,Y. Fujii,Yasuo Higashi,Yoshimasa Kurihara,A. Maki, T. Nozaki,Tsunehiko Omori, P. Perez,Hiroyuki Sagawa,Y. Sakai,Y. Sugimoto, Y. Takaiwa,Susumu Terada,Kiyosumi Tsuchiya,R. Poling,James C. Green,I. H. Park,S. Sakamoto, F. Sannes,Steve Schnetzer,Robert Stone,S. Trentalange, D. Zimmerman,K. Miyano,H. Miyata,M. Ogawa,Y. Yamashita, D. Blanis,A. Bodek,H. S. Budd, R. Coombes,Sarah Catherine Eno,C. A. Fry,H. Harada,Y. H. Ho,Yk Kim, T. Kumita, T. Mori,S. L. Olsen,N. M. Shaw,A. Sill, E. H. Thorndike,K. Ueno,H. W. Zheng,H. Asakura,K. Eguchi,H. Itoh,S. Kobayashi,A. Murakami,K. Toyoshima,J. S. Kang,Hj Kim,S. K. Kim,M. H. Lee,S. S. Myung,H. Kozuka,S. Matsumoto,T. Sasaki,T. Takeda, R. Tanaka, R. Chiba, K. Hanaoka, S. Igarashi, H. Murata, H. Yokota, Y. Ishi,T. Ishizuka,K. Ohta

Physical Review Letters（1988）

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摘要

A search for pair production for fourth-generation sequential leptons in e/sup +/e/sup -/ annihilation at a center-of-mass energy ..sqrt..s = 56 GeV is reported. Event topologies corresponding to the cases where one particle decays leptonically while the other decays hadronically as well as those where both particles decay hadronically were explored. We set a 95%-confidence-level lower limit of 27.6 GeV/c/sup 2/ for the mass of a fourth-generation lepton.

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