A Combination of preliminary electroweak measurements and constraints on the standard model - INSPIRE

DataBETA

A Combination of preliminary electroweak measurements and constraints on the standard model

Collaborations

and

•

D. Abbaneo

Dec, 2001

151 pages

e-Print:

hep-ex/0112021 [hep-ex]

Report number:

SLAC-PUB-9498,
CERN-EP-2001-098,
LEPEWWG-2001-02,
ALEPH-2001-078-PHYS-2001-028,
DELPHI-2001-131-PHYS-906,
L3-NOTE-2723,
OPAL-PR-350

Experiments:

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Abstract: (arXiv)

This note presents a combination of published and preliminary electroweak results from the four LEP collaborations and the SLD collaboration which were prepared for the 2001 summer conferences. Averages from Z resonance results are derived for hadronic and leptonic cross sections, the leptonic forward-backward asymmetries, the tau polarisation asymmetries, the b-bbar and c-cbar partial widths and forward-backward asymmetries and the q-qbar charge asymmetry. Above the Z resonance, averages are derived for di-fermion cross sections and forward-backward asymmetries, W-pair, Z-pair and single-W production cross section, electroweak gauge boson couplings, W mass and width and W decay branching ratios. For the first time, total and differential cross sections for di-photon production are combined. The main changes with respect to the experimental results presented in summer 2000 are updates to the Z-pole heavy flavour results from SLD and LEP and to the W mass from LEP. The results are compared with precise electroweak measurements from other experiments. Using a new evaluation of the hadronic vacuum polarisation, the parameters of the Standard Model are evaluated, first using the combined LEP electroweak measurements, and then using the full set of electroweak results.

Note:

152 pages, minor changes to the title page only

review: experimental results
electron positron: colliding beams
electron positron: annihilation
electroweak interaction
Z0: electroproduction
Z0: decay modes
angular distribution: asymmetry
tau: polarization
heavy quark
hadron: multiple production

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Figures(57)

A Combination of preliminary electroweak measurements and constraints on the standard model

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