## Abstract

The forward-backward asymmetry of {Mathematical expression} has been measured using approximately 2.15 million hadronic Z^{0} decays collected at the LEP e^{+}e^{-} collider with the OPAL detector. A lifetime tag technique was used to select an enriched {Mathematical expression} event sample. The measurement of the {Mathematical expression} asymmetry was then performed using a jet charge algorithm to determine the direction of the primary quark. Values of: {Mathematical expression} were measured where, in each case, the first error is statistical, the second is systematic and the third term gives the variation due to a change {Mathematical expression} in the value of {Mathematical expression} assumed. The dependence on the assumed charm asymmetry at the same energy is Δ(A_{FB} ^{b})≈+0.07Δ(A_{FB} ^{c }). Assuming the Standard Model form for the couplings, these measurements correspond to an effective weak mixing angle of: {Mathematical expression} giving M_{top}=196_{-38-19} ^{+33+16}GeV/c^{2}, where the first error is statistical and the second is systematic. The Higgs mass assumed is 300 GeV/c^{2}. A variation in the assumed mass of the Higgs boson between 60 and 1000 GeV/c^{2} corresponds to an uncertainty in sin^{2}θ_{W} ^{eff,e} of ±0.00006 and on M_{top} of_{-26} ^{+20}GeV/c^{2}.

Original language | English |
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Pages (from-to) | 365-378 |

Number of pages | 14 |

Journal | European Physical Journal C |

Volume | 67 |

Issue number | 3 |

DOIs | |

State | Published - 1 Sep 1995 |

Externally published | Yes |

## ASJC Scopus subject areas

- Engineering (miscellaneous)
- Physics and Astronomy (miscellaneous)

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