Cross-Sections and Leptonic Forward-Backward Asymmetries from the $Z^0$Running of LEP

Abstract : During 1993 and 1995 LEP was run at 3 energies near the Z$^0$ peak in order to give improved measurements of the mass and width of the resonance. During 1994, LEP operated only at the Z$^0$peak. In total DELPHI accumulated data corresponding to an integrated luminosity of approximately 116~pb$^{-1}$. Analyses ofthe hadronic cross-sections and of the cross-sections and forward-backward asymmetries in the leptonic channels used the most precise evaluations of the LEP energies. In the dimuon channel, events with a photon radiated from the initialstate have been used to probe the cross-sections and asymmetries down to PETRA energies.Model independent fits to all DELPHI lineshape and asymmetry data from 1990 to 1995have been carried out giving values ofthe resonance parameters:\MZ & = & 91.1863\pm0.0028~\GeV \\\GZ & = & ~2.4876\pm0.0041~\GeV \\ \sigma_{0} & = & 41.578\pm0.069~\nb \\R_l & = & 20.730\pm0.060 \\\Afbzero & = & 0.0187\pm0.0019.These values are significantly more precise than those previously published. The results are interpreted in terms of the Standard Model.
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Submitted on : Wednesday, September 6, 2000 - 4:41:38 PM
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• HAL Id : in2p3-00005354, version 1

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P. Abreu, W. Adam, T. Adye, P. Adzic, G D. Alekseev, et al.. Cross-Sections and Leptonic Forward-Backward Asymmetries from the $Z^0$Running of LEP. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2000, 16, pp.371-405. ⟨in2p3-00005354⟩

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