An Improved Measurement of the Left-Right Z0 Cross Section Asymmetry

Details An Improved Measurement of the Left-Right Z0 Cross Section Asymmetry An Improved Measurement of the Left-Right Z0 Cross Section Asymmetry

1996-11-18

arxiv.org/abs/hep-ex/9611011v1

Phys.Rev.Lett.78:2075-2079,1997

Physics

High Energy Physics

High Energy Physics - Experiment

16 pages, RevTeX document, no figures. Also available in gzip-compressed postscript form (58 Kb) at ftp://ftp.slac.stanford.

Scientific paper

10.1103/PhysRevLett.78.2075

We present a new measurement of the left-right cross section asymmetry (ALR) for Z boson production by e+e- collisions. The measurement was performed at a center-of-mass energy of 91.28 GeV with the SLD detector at the SLAC Linear Collider (SLC). The luminosity-weighted average polarization of the SLC electron beam was (77.23+-0.52)%. Using a sample of 93,644 Z decays, we measure the pole-value of the asymmetry, ALR0, to be 0.1512+-0.0042(stat.)+-0.0011(syst.) which is equivalent to an effective weak mixing angle of sin**2(theta_eff)=0.23100+-0.00054(stat.)+-0.00014(syst.).

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