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

Abstract

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.).

arXiv comment16 pages, RevTeX document, no figures. Also available in gzip-compressed postscript form (58 Kb) at ftp://ftp.slac.stanford.edu/users/morris/alr95_preprint.ps.gz and /afs/slac.stanford.edu/public/users/morris/alr95_preprint.ps.gz. Uncompressed postscript file (214 Kb) available to DECNET users as SLC::USER_DISK_SLC1:[MORRIS]alr95_preprint.ps

References in corpus (3)

• Observation of Top Quark Production in Pbar-P Collisions
• Observation of the Top Quark
• Precise Measurement of the Left-Right Cross Section Asymmetry in $Z$ Boson Production by $\ee$ Collisions

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