Search for a fourth-generation charge -(1/3 quark

S. Eno, P. Auchincloss, D. Blanis, A. Bodek, H. Budd, 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, R. Imlay, P. Kirk, J. LimR. R. McNeil, W. Metcalf, S. S. Myung, C. P. Cheng, P. Gu, J. Li, Y. K. Li, Z. P. Mao, Y. T. Xu, Y. C. Zhu, A. Abashian, K. Gotow, K. P. Hu, E. H. Low, M. E. Mattson, L. Piilonen, K. L. Sterner, S. Lusin, C. Rosenfeld, A. T.M. Wang, S. Wilson, M. Frautschi, H. Kagan, R. Kass, C. G. Trahern, R. E. Breedon, G. N. Kim, Winston Ko, R. L. Lander, K. Maeshima, R. L. Malchow, J. R. Smith, D. Stuart, M. C.S. Williams, K. Abe, Y. Fujii, Y. Higashi, S. K. Kim, Y. Kurihara, A. Maki, T. Nozaki, T. Omori, H. Sagawa, Y. Sakai, Y. Sugimoto, Y. Takaiwa, S. Terada, R. Walker, F. Kajino, D. Perticone, R. Poling, T. Thomas, Y. Ishi, K. Miyano, H. Miyata, T. Sasaki, Y. Yamashita, A. Bacala, I. H. Park, F. Sannes, S. Schnetzer, R. Stone, J. Vinson, H. Asakura, H. Itoh, S. Kobayashi, A. Murakami, K. Toyoshima, J. S. Kang, H. J. Kim, M. H. Lee, D. H. Han, E. J. Kim, D. Son, T. Kojima, S. Matsumoto, R. Tanaka, Y. Yamagishi, T. Yasuda, H. Yokota, T. Ishizuka, K. Ohta

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15 Scopus citations

Abstract

By studying e+e- annihilations in the center-of-mass energy range between 50 and 60.8 GeV, we have established a 95%-confidence-level lower limit on the mass of a fourth-generation charge -(1/3 quark b of 27.2 GeV. In contrast with all previous searches, this limit has been obtained through consideration of the decay processes b'b and b'bg aswell as b'cW-. For the cases where any one of the three decay modes dominates, we obtain higher mass limits.

Original languageEnglish (US)
Pages (from-to)1910-1913
Number of pages4
JournalPhysical review letters
Volume63
Issue number18
DOIs
StatePublished - 1989

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