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 / Delphi, C., Abreu, P., Adam, W., Canale, V.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - STAMPA. - 10:(1999), pp. 219-237. [10.1007/s100520050584]
Measurement of the forward backward asymmetry of c and b quarks at the Z pole using reconstructed D mesons
CANALE, VINCENZO
1999
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
