[SLAC] [SLAC Pubs and Reports]

SLAC-PUB-7069
First Measurement of the Left-Right Charge Asymmetry in Hadronic 1 Boson Decays and a New Determination of sin2 qeffw

Abstract

We present the first measurement of the left-right charge asymmetry $A_Q^{obs}$ in hadronic $Z$ boson decays. This was performed at E$_{\rm cm}$ = 91.27~GeV with the SLD at the SLAC Linear Collider with a polarized electron beam. Using 89838 events, we obtain $A_Q^{obs}=0.225 \pm 0.056~\pm 0.019$ which leads to a measurement of the electron left-right asymmetry parameter, $A_e = 0.162 \pm 0.041~\pm 0.014~$, and $\swein = 0.2297\pm 0.0052 \pm 0.0018$. Also, the $A_Q^{obs}$ measurement combined with the left-right cross section asymmetry determines $A_e$ independent of the value of the electron-beam polarization. %If we include the %$A^{obs}_{LR}$ measurement we get $A_e = 0.1546 \pm 0.0196~(stat.)\pm 0.00067~ %(syst.) $ and $\swein = 0.2306 \pm 0.0025~(stat.) \pm 0.0009~(syst.)$.

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