Determination of the effective electroweak mixing angle from Z decay

Adriani, O.; Aguilar-Benitez, M.; Ahlen, S.P.; Alcaraz, J.; Aloisio, A.; Alverson, G.; Alviggi, M.G.; Ambrosi, G.; An, Q.; Anderhub, H.

doi:10.1016/0370-2693(93)90961-G

Determination of the effective electroweak mixing angle from Z decay

L3

Collaboration

Apr, 1993

18 pages

Published in:

Phys.Lett.B 309 (1993) 451-462

DOI:

10.1016/0370-2693(93)90961-G

Report number:

CERN-PPE-93-68

Experiments:

CERN-LEP-L3

View in:

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Abstract: (Elsevier)

The effective electroweak mixing angle sin 2 θ w is measured from the production and decay of the Z boson in e + e − interactions. The data sample corresponds to an integrated luminosity of 18pb −1 with about 420 000 hadronic and 40 000 leptonic Z decays. The mixing angle sin 2 θ w is determined from several independent measurements: the leptonic and hadronic cross sections, the forward-backward asymmetries of charged leptons and b-quarks, and the τ-polarization. The results are found to be in good agreement with each other. The value of sin 2 θ w from a fit to the asymmetries in a model independent method is 0.2321±0.0021 and from a global fit to the data in the Standard Model framework is 0.2328±0.0013.

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
Z0: electroproduction
electroproduction: Z0
Weinberg angle
cross section: hadronic
angular distribution: asymmetry
asymmetry: angular distribution

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Figures(0)

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