Measurement of R and search for new heavy quarks in e+e- annihilation at 50 and 52 GeV centre-of-mass energies

H. Yoshida, Y. Chiba, I. Endo, I. Hayashibara, T. Ohsugi, A. Taketani, R. Tanaka, K. Amako, Y. Arai, H. Boerner, M. Fukawa, Y. Fukushima, N. Ishihara, J. Kanzaki, T. Kondo, K. Maehata, T. Matsui, S. Odaka, K. Ogawa, T. OhamaH. Sakamoto, M. Sakuda, J. Shirai, T. Sumiyoshi, F. Suekane, Y. Teramoto, F. Takasaki, T. Tsuboyama, S. Uehara, Y. Unno, M. Wake, Y. Watase, Y. Yamada, Y. Noguchi, A. Ono, Y. Homma, Y. Hojyo, H. Sakae, Y. Hemmi, R. Kikuchi, K. Kubo, H. Kurashige, K. Miyake, T. Nakamura, N. Sasao, N. Tamura, K. Tobimatsu, J. Haba, T. Kamitani, N. Kanematsu, Y. Nagashima, H. Osabe, S. Sakamoto, S. Sugimoto, Y. Suzuki, A. Tsukamoto, T. Yamashita, K. Abe, M. Higuchi, Y. Hoshi, M. Sato, T. Emura, M. Chiba, T. Fukui, T. Hirose, Y. Nakagawa, M. Minami, H. Saito, M. Wakai, T. Watanabe, T. Yamagata, Y. Asano, T. Koseki, S. Mori, M. Sakano, M. Shioden, Y. Takada, Y. Ikegami, I. Nakano, M. Daigo

研究成果: Contribution to journalArticle査読

51 被引用数 (Scopus)

抄録

The total cross section for the process of the e+e- annihilation into hadrons has been measured at the centre-of-mass energies of 50 GeV and 52 GeV and a search has been made for new heavy quarks. The ratios R = σ(e+e- → hadrons)/σpoint(e+e- → μ+μ-) obtained are 4.4±0.5 at 50 GeV and 4.7±0.3 at 52 GeV, respectively. An additional systematic uncertainty is 10%. From the event shape analysis we found no evidence for a new quark with charge 2 3e.

本文言語英語
ページ(範囲)570-576
ページ数7
ジャーナルPhysics Letters B
198
4
DOI
出版ステータス出版済み - 12 3 1987

All Science Journal Classification (ASJC) codes

  • 核物理学および高エネルギー物理学

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