Publication
Title
Measurements of the lineshape of the and determination of electroweak parameters from its hadronic and leptonic decays
Author
Abstract
During the LEP running periods in 1990 and 1991 DELPHI has accumulated approximately 450000 Z0 decays into hadrons and charged leptons. The increased event statistics coupled with improved analysis techniques and improved knowledge of the LEP beam energies permit significantly better measurements of the mass and width of the Z0 resonance. Model independent fits to the cross sections and leptonic forward-backward asymmetries yield the following Z0 parameters: the mass and total width M(Z) = 91.187 +/- 0.009 GeV, GAMMA(Z) = 2.486 +/- 0.012 GeV, the hadronic and leptonic partial widths GAMMA(had) = 1.725 +/- 0.012GeV, GAMMA(l) = 83.01 +/- 0.52 MeV, the invisible width GAMMA(inv) = 512 +/- 10 MeV, the ratio of hadronic to leptonic partial widths R(l) = 20.78 +/- 0.15, and the Born level hadronic peak cross section sigma0 = 40.90 +/- 0.28 nb. Using these results and the value of alpha(s) determined from DELPHI data, the number of light neutrino species is determined to be 3.08 +/- 0.05. The individual leptonic widths are found to be: GAMMA(e) = 82.93 +/- 0.70 MeV, GAMMA(mu) = 83.20 +/- 1.11 MeV and GAMMA(tau) = 82.89 +/- 1.31 MeV. Using the measured leptonic forward-backward asymmetries and assuming lepton universality, the squared vector and axial-vector couplings of the Z0 to charged leptons are found to be g(V)l2 = (1.47 +/- 0.51) x 10(-3) and g(A)l2 = 0.2483 +/- 0.0016. A full Standard Model fit to the data yields a value of the top mass m(t) = 115(-82)+52 (expt.)-24(+23) (Higgs) GeV, corresponding to a value of the weak mixing angle sin2 theta(eff)lept = 0.2339 +/- 0.0015(expt.)-0.0004(+0.0001) (Higgs). Values are obtained for the variables S and T, or epsilon1 and epsilon3 which parameterize electroweak loop effects.
Language
English
Source (journal)
Nuclear physics: B. - Amsterdam
Publication
Amsterdam : 1994
ISSN
0550-3213
0029-5582
Volume/pages
417:1-2(1994), p. 3-57
ISI
A1994NK18300001
Full text (Publisher's DOI)
Full text (publisher's version - intranet only)
UAntwerpen
Faculty/Department
Research group
[E?say:metaLocaldata.cgzprojectinf]
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 19.07.2012
Last edited 20.11.2017
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