High-Precision Measurement of the Left-Right $Z$ Boson Cross-Section Asymmetry

26 June 2000

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

Vol. 84 (26) , 5945-5949
https://doi.org/10.1103/physrevlett.84.5945

Abstract

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

A_{LR}

) for

Z

boson production by

e^{+} e^{-}

collisions. The measurement includes the final data taken with the SLD detector at the SLAC Linear Collider during the period 1996–1998. Using a sample of 383 487

Z

decays collected during the 1996–1998 runs we measure the pole value of the asymmetry,

A_{LR}^{0}

, to be

0.150 56 \pm 0.002 39

which is equivalent to an effective weak mixing angle of

{sin}^{2} θ_{W}^{eff} = 0.231 07 \pm 0.000 30

. Our result for the complete 1992–1998 data set comprising approximately 537 000

Z

decays is

{sin}^{2} θ_{W}^{eff} = 0.230 97 \pm 0.000 27

Keywords

CROSS SECTION

All Related Versions

Version 1, 2000-04-25, ArXiv

This publication has 9 references indexed in Scilit:

Measurement of electron beam polarization from the energy asymmetry of Compton scattered photons
IEEE Transactions on Nuclear Science, 1998
A Møller polarimeter for high energy electron beams
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1997
Improved Measurement of the Left-Right $Z^{0}$ Cross Section Asymmetry
Physical Review Letters, 1997
Performance of the SLD central drift chamber
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1995
Precise Measurement of the Left-Right Cross Section Asymmetry in $Z$ Boson Production by $e^{+} e^{-}$ Collisions
Physical Review Letters, 1994
The lead-liquid argon sampling calorimeter of the SLD detector
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1993
First measurement of the left-right cross section asymmetry inZboson production by $e^{+}$ $e^{-}$ collisions
Physical Review Letters, 1993
First results from the SLD silicon calorimeters
IEEE Transactions on Nuclear Science, 1992
Compton Scattering of 2.62-Mev Gamma Rays by Polarized Electrons
Physical Review B, 1953

High-Precision Measurement of the Left-RightZBoson Cross-Section Asymmetry

Abstract

Keywords

All Related Versions

High-Precision Measurement of the Left-Right $Z$ Boson Cross-Section Asymmetry