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. Inoue - et al.

doi:doi:10.1007/s100520000541

2024 Impact factor 4.8

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. Fujii^6,9 - 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 A_FB^q 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.