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 forwardbackward 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 forwardbackward asymmetries and assuming lepton universality, the squared vector and axialvector 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 



05503213
00295582
 
Volume/pages 



417:12(1994), p. 357
 
ISI 



A1994NK18300001
 
Full text (Publishers DOI) 


  
Full text (publishers version  intranet only) 


  
