We present a precise measurement of the left-right cross section asymmetry (A(LR)) for Z boson production by e+e-. The measurement was perfomed at a center-of-mass energy of 91.26 GeV with the SLD detector at the SLAC Linear Collider (SLC). The luminosity-weighted average polarization of the SLC electron beam was (63.0 +/- 1.1)%. Using a sample of 49392 Z decays, we measure A(LR) to be 0.1628 +/- 0.0071 (stat) +/- 0.0028 (syst) which determines the effective weak mixing angle to be sin2 theta(W)eff = 0.2292 +/- 0.0009 (stat) +/- 0.0004 (syst).
Precise Measurement of the Left-right Cross-section Asymmetry In Z Boson Production By E+e- Collisions
BISELLO, DARIO;LORETI, MAURIZIO;
1994
Abstract
We present a precise measurement of the left-right cross section asymmetry (A(LR)) for Z boson production by e+e-. The measurement was perfomed at a center-of-mass energy of 91.26 GeV with the SLD detector at the SLAC Linear Collider (SLC). The luminosity-weighted average polarization of the SLC electron beam was (63.0 +/- 1.1)%. Using a sample of 49392 Z decays, we measure A(LR) to be 0.1628 +/- 0.0071 (stat) +/- 0.0028 (syst) which determines the effective weak mixing angle to be sin2 theta(W)eff = 0.2292 +/- 0.0009 (stat) +/- 0.0004 (syst).File in questo prodotto:
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