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

G. N. Kim, E. J. Kim, D. Son, A. Bacala, R. Imlay, P. Kirk, R. R. McNeil, W. Metcalf, C. P. Cheng, Z. P. Mao, Y. Yan, Y. T. Xu, Y. C. Zhu, A. Abashian, K. Gotow, F. Kajino, E. Low, F. Naito, L. Piilonen, R. ChildersC. Darden, S. Lusin, C. Rosenfeld, S. Wilson, M. Frautschi, H. Kagan, R. Kass, C. G. Trahern, Winston Ko, R. L. Lander, K. Maeshima, R. L. Malchow, J. R. Smith, K. Sparks, M. C.S. Williams, K. Abe, S. Chakrabarti, Y. Fujii, Y. Higashi, Y. Kurihara, A. Maki, T. Nozaki, T. Omori, P. Perez, H. Sagawa, Y. Sakai, Y. Sugimoto, Y. Takaiwa, S. Terada, K. Tsuchiya, R. Poling, J. Green, I. H. Park, S. Sakamoto, F. Sannes, S. Schnetzer, R. Stone, S. Trentalange, D. Zimmerman, K. Miyano, H. Miyata, M. Ogawa, Y. Yamashita, D. Blanis, A. Bodek, H. Budd, R. Coombes, S. Eno, C. A. Fry, H. Harada, Y. H. Ho, Y. K. 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, H. J. 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

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8 Scopus citations


A search for pair production of fourth-generation sequential leptons in e+e- annihilation at a center-of-mass energy 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/c2 for the mass of a fourth-generation lepton.

Original languageEnglish (US)
Pages (from-to)911-914
Number of pages4
JournalPhysical review letters
Issue number8
StatePublished - 1988


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