We present the first measurement of the left-right charge asymmetry A(Q)(obs) in hadronic Z boson decays. This was performed at E(c.m.) = 91.27 GeV with the SLD at the SLAG Linear Collider with a polarized electron beam. Using 89 838 events we obtain A(Q)(obs) = 0.225 +/- 0.056 +/- 0.019, which leads to a measurement of the electron left-right asymmetry parameter. A(e) = 0.162 +/- 0.041 +/- 0.014, and sin(2) theta(W)(eff) = 0.2297 +/- 0.0052 +/- 0.0018, Also, the Ag measurement combined with the left-right cross section asymmetry determines A(e) independent of the value of the electron-beam polarization.
First measurement of the left-right charge asymmetry in hadronic Z boson decays and a new determination of sin(2)O(w)(eff)
BISELLO, DARIO;
1997
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(c.m.) = 91.27 GeV with the SLD at the SLAG Linear Collider with a polarized electron beam. Using 89 838 events we obtain A(Q)(obs) = 0.225 +/- 0.056 +/- 0.019, which leads to a measurement of the electron left-right asymmetry parameter. A(e) = 0.162 +/- 0.041 +/- 0.014, and sin(2) theta(W)(eff) = 0.2297 +/- 0.0052 +/- 0.0018, Also, the Ag measurement combined with the left-right cross section asymmetry determines A(e) independent of the value of the electron-beam polarization.File in questo prodotto:
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