Measurement of the forward backward asymmetry of c and b quarks at the Z pole using reconstructed D mesons
DELPHI Collaboration · al, P. Abreu et
Original · EN
A measurement of the forward--backward asymmetry of e⁺e⁻ → cc and e⁺e⁻ → bb 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: 1.6 arrayrcr@l (√s = 91.235 GeV) &=& &0.0659 ± 0.0094 (stat) ± 0.0035 (syst) (√s = 91.235 GeV) &=& &0.0762 ± 0.0194 (stat) ± 0.0085 (syst) (√s = 89.434 GeV) &=&-&0.0496 ± 0.0368 (stat) ± 0.0053 (syst) (√s = 89.434 GeV) &=& &0.0567 ± 0.0756 (stat) ± 0.0117 (syst) (√s = 92.990 GeV) &=& &0.1180 ± 0.0318 (stat) ± 0.0062 (syst) (√s = 92.990 GeV) &=& &0.0882 ± 0.0633 (stat) ± 0.0122 (syst) array The combination of these results leads to an effective electroweak mixing angle of: SINEFF = 0.2332 ± 0.0016
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