Precise measurement of the left-right cross-section asymmetry in Z boson production by e+ e- collisions

Abe, K.; Abt, I.; Ash, W.W.; Aston, D.; Bacchetta, N.; Baird, K.G.; Baltay, C.; Band, H.R.; Barakat, M.B.; Baranko, G.J.

doi:10.1103/PhysRevLett.73.25

Precise measurement of the left-right cross-section asymmetry in Z boson production by e+ e- collisions

SLD

Collaboration

Mar, 1994

15 pages

Published in:

Phys.Rev.Lett. 73 (1994) 25-29

e-Print:

hep-ex/9404001 [hep-ex]

DOI:

10.1103/PhysRevLett.73.25

Report number:

SLAC-PUB-6456

Experiments:

SLAC-SLC-SLD

View in:

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Abstract: (arXiv)

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

A_{LR}

) for

Z

boson production by \ee collisions. The measurement was performed 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

\pm

1.1)%. Using a sample of 49,392 \z0 decays, we measure

A_{LR}

to be 0.1628

\pm

0.0071(stat.)

\pm

0.0028(syst.) which determines the effective weak mixing angle to be \swein=0.2292\pm0.0009({\rm stat.})\pm0.0004({\rm syst.}).}

Note:

15 pages, no figures

electron positron: colliding beams
electron positron: annihilation
Z0: electroproduction
electron: polarized beam
polarization: longitudinal
Z0: nonleptonic decay
Z0: leptonic decay
tau: pair production
polarization: asymmetry
Weinberg angle

References(10)

Figures(0)

First measurement of the left-right cross-section asymmetry in Z boson production by e+ e- collisions

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