A measurement of the forward-backward asymmetry of e(+)e(-) --> c (c) over bar and e(+)e(-) --> b (b) over bar on the Z resonance is performed using about 3.5 million hadronic Z decays collected by the DELPHI detector at LEP in the years 1992 to 1995. The heavy quark is tagged by the exclusive reconstruction of several D meson decay modes. The forward-backward asymmetries for c and b quarks at the Z resonance are determined to be: A(FB)(c)(root s = 91.235 GeV) = 0.0659 +/- 0.0094(stat) +/- 0.0035(syst) A(FB)(b)(root s = 91.235 GeV) = 0.0762 +/- 0.0194(stat) +/- 0.0085(syst) A(FB)(c)(root s = 89.434GeV) = -0.0496 +/- 0.0368(stat) +/- 0.0053(syst) A(FB)(b)(root s = 89.434 GeV) = 0.0567 +/- 0.0756(stat) +/- 0.0117(syst) A(FB)(c)(root s = 92.990 GeV) = 0.1180 +/- 0.0318(stat) +/- 0.0062(syst) A(FB)(b)(root s = 92.990 GeV) = 0.0882 +/- 0.0633(stat) +/- 0.0122(syst) The combination of these results leads to an effective electroweak mixing angle of: sin(2) theta(eff)(lept) = 0.2332 +/- 0.0016.

Measurement of the forward backward asymmetry of c and b quarks at the Z pole using reconstructed D mesons

BIANCHI, Fabrizio;MIGLIORE, Ernesto;ROMERO, Alessandra;
1999-01-01

Abstract

A measurement of the forward-backward asymmetry of e(+)e(-) --> c (c) over bar and e(+)e(-) --> b (b) over bar on the Z resonance is performed using about 3.5 million hadronic Z decays collected by the DELPHI detector at LEP in the years 1992 to 1995. The heavy quark is tagged by the exclusive reconstruction of several D meson decay modes. The forward-backward asymmetries for c and b quarks at the Z resonance are determined to be: A(FB)(c)(root s = 91.235 GeV) = 0.0659 +/- 0.0094(stat) +/- 0.0035(syst) A(FB)(b)(root s = 91.235 GeV) = 0.0762 +/- 0.0194(stat) +/- 0.0085(syst) A(FB)(c)(root s = 89.434GeV) = -0.0496 +/- 0.0368(stat) +/- 0.0053(syst) A(FB)(b)(root s = 89.434 GeV) = 0.0567 +/- 0.0756(stat) +/- 0.0117(syst) A(FB)(c)(root s = 92.990 GeV) = 0.1180 +/- 0.0318(stat) +/- 0.0062(syst) A(FB)(b)(root s = 92.990 GeV) = 0.0882 +/- 0.0633(stat) +/- 0.0122(syst) The combination of these results leads to an effective electroweak mixing angle of: sin(2) theta(eff)(lept) = 0.2332 +/- 0.0016.
1999
10
219
237
P. Abreu;T. Adye;P. Adzic;Z. Albrecht;T. Alderweireld;G. D. Alekseev;R. Alemany;T. Allmendinger;P. P. Allport;S. Almehed;U. Amaldi;S. Amat...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/103405
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