Improved Measurement of the Left-Right $Z^{0}$ Cross Section Asymmetry

17 March 1997

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 78 (11) , 2075-2079
https://doi.org/10.1103/physrevlett.78.2075

Abstract

We present a new measurement of the left-right cross section asymmetry

(A_{LR})

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 \pm 0.52) %

. Using a sample of 93 644

Z

decays, we measure the pole value of the asymmetry,

A_{LR}^{0}

, to be

0.1512 \pm 0.0042 (stat) \pm 0.0011 (syst)

, which is equivalent to an effective weak mixing angle of

\sin^{2} θ_{W}^{eff} = 0.231 00 \pm 0.000 54 (stat) \pm 0.000 14 (syst)

Keywords

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Version 1, 1996-11-18, ArXiv

This publication has 9 references indexed in Scilit:

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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1995
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Physical Review Letters, 1994
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Physical Review Letters, 1993
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Physical Review B, 1992
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Improved Measurement of the Left-RightZ0Cross Section Asymmetry

Abstract

Keywords

All Related Versions

Improved Measurement of the Left-Right $Z^{0}$ Cross Section Asymmetry