Measurements of cross sections and forward-backward asymmetries at the Z resonance and determination of electroweak parameters

Abstract. We report on measurements of hadronic and leptonic cross sections and leptonic forward-backward asymmetries performed with the L3 detector in the years 1993–95. A total luminosity of $$103 {\rm pb}^{-1}$$ was collected at centre-of-mass energies $$\sqrt s \approx m_{\rm Z}$$ and $$\sqrt s \approx m_{\rm Z} \pm 1.8{\rm GeV}$$ which corresponds to 2.5 million hadronic and 245 thousand leptonic events selected. These data lead to a …