EPJ

2024 Impact factor 4.8
EPJ C - Particles and Fields
Particles and Fields
Eur. Phys. J. C 18, 273-282
DOI 10.1007/s100520000541

Measurement of the cross-section
and forward-backward charge asymmetry for the b and c-quark in e+e- annihilation with inclusive muons at $\sqrt{s} = 58$ GeV

Y. Inoue1 - A. Miyamoto2 - E. Nakano1 - T. Takahashi1 - T. Tauchi2 - Y. Teramoto1 - K. Abe3 - T. Abe3 - I. Adachi2 - K. Adachi4 - M. Aoki3 - M. Aoki5 - R. Enomoto2 - K. Emi2 - H. Fujii2 - K. Fujii2 - T. Fujii6,9 - J. Fujimoto2 - N. Fujiwara4 - H. Hirano5 - B. Howell7 - H. Hayashii4 - N. Iida2 - H. Ikeda2 - S. Itami3 - R. Itoh2 - H. Iwasaki2 - M. Iwasaki4 - R. Kajikawa3 - K. Kaneyuki5 - S. Kato2 - S. Kawabata2 - H. Kichimi2 - M. Kobayashi2 - D. Koltick7 - I. Levine7 - H. Mamada8 - K. Miyabayashi4 - K. Muramatsu4 - K. Nagai9 - K. Nakabayashi3 - M. Nakamura1 - S. Noguchi4 - O. Nitoh8 - A. Ochi5 - F. Ochiai10 - N. Ohishi3 - Y. Ohnishi2 - Y. Ohshima5 - H. Okuno2 - T. Okusawa11 - E. Shibata7 - A. Sugiyama3 - H. Sugiyama4 - S. Suzuki3 - K. Takahashi2 - T. Tanimori5 - M. Tomoto3 - T. Tsukamoto2 - T. Tsumura8 - S. Uno2 - Y. Watanabe5 - A. Yamamoto2 - M. Yamauchi2

1 Institute for Cosmic Ray Physics, Osaka City University, Osaka 558-8585, Japan
2 KEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
3 Department of Physics, Nagoya University, Nagoya 464-8601, Japan
4 Department of Physics, Nara Women's University, Nara 630-8506, Japan
5 Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan
6 Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
7 Department of Physics, Purdue University, West Lafayette, IN 47907, USA
8 Department of Applied Physics, Tokyo University of Agriculture and Technology, Tokyo 184-8588, Japan
9 Department of Physics, The Graduate School of Science and Technology, Kobe University, Kobe 657-8501, Japan
10 Department of Physics, Faculty of Liberal Arts, Tezukayama Gakuin University, Nara 631, Japan
11 Department of Physics, Osaka City University, Osaka 558-8585, Japan

Received: 18 October 2000 / Revised version: 2 November 2000 /
Published online: 27 November 2000 - © Springer-Verlag 2000

Abstract
We have studied inclusive muon events using all the data collected by the TOPAZ detector at $\sqrt{s} = 58$GeV with an integrated luminosity of 273pb-1. From 1328 inclusive muon events, we measured the ratio $R_{q\bar{q}}$ of the cross section for $q\bar{q}$ production to the total hadronic cross section and forward-backward asymmetry AFBq for b and c quarks. The obtained results are $R_{b\bar{b}}=0.13\pm0.02(stat)\pm0.01(syst)$, $R_{c\bar{c}}=0.36\pm0.05(stat)\pm0.05(syst)$, $A_{FB}^{b}=-0.20\pm0.16(stat)\pm0.01(syst)$ and $A_{FB}^{c}=-0.17\pm0.14(stat)\pm0.02(syst)$, in fair agreement with a prediction of the standard model.

Copyright Società Italiana di Fisica, Springer-Verlag 2000

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