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Precision electroweak measurements on the Z resonance
ALEPH Collaborat; DELPHI Collaborat; OPAL Collaborat; SLD Collaborat;  LEP ElectroweakWorking Group;   SLD Electroweak and Heavy Flavour Groups
2006
Source PublicationPHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
Volume427Issue:5--6Pages:257-454
Corresponding AuthorSchael, S (reprint author), Univ Coll Dublin, Sch Phys, Dublin 4, Ireland.
AbstractWe report on the final electroweak measurements performed with data taken at the Z resonance by the experiments operating at the electron-positron colliders SLC and LEP. The data consist of 17 million Z decays accumulated by the ALEPH, DELPHI, L3 and OPAL experiments at LEP, and 600 thousand Z decays by the SLID experiment using a polarised beam at SLC. The measurements include cross-sections, forward-backward asymmetries and polarised asymmetries. The mass and width of the Z boson, m(Z) and Gamma(Z), and its couplings to fermions, for example the p parameter and the effective electroweak mixing angle for leptons, are precisely measured: m(Z) = 91.1875 +/- 0.0021 GeV, Gamma(Z) = 2.4952 +/- 0.0023 GeV, rho(l) = 1.0050 +/- 0.0010, sin(2)theta(eff)(lept) = 0.23153 +/- 0.00016. The number of light neutrino species is determined to be 2.9840 +/- 0.0082, in agreement with the three observed generations of fundamental fermions. The results are compared to the predictions of the Standard Model (SM). At the Z-pole, electroweak radiative corrections beyond the running of the QED and QCD coupling constants are observed with a significance of five standard deviations, and in agreement with the Standard Model. Of the many Z-pole measurements, the forward-backward asymmetry in b-quark production shows the largest difference with respect to its SM expectation, at the level of 2.8 standard deviations. Through radiative corrections evaluated in the framework of the Standard Model, the Z-pole data are also used to predict the mass of the top quark, m(t) = 173(+10)(+13) GeV, and the mass of the W boson, m(W) = 80.363 +/- 0.032 GeV. These indirect constraints are compared to the direct measurements, providing a stringent test of the SM. Using in addition the direct measurements of m(t) and m(W), the mass of the as yet unobserved SM Higgs boson is predicted with a relative uncertainty of about 50% and found to be less than 285 GeV at 95% confidence level. (c) 2006 Elsevier B.V. All rights reserved.
KeywordFORWARD-BACKWARD ASYMMETRY FERMION-PAIR PRODUCTION HADRONIC-Z-DECAYS TOP-QUARK MASS ANGLE BHABHA SCATTERING W-BOSON MASS CROSS-SECTION ASYMMETRY Z-LINE-SHAPE SEMILEPTONIC BRANCHING RATIOS CARLO EVENT GENERATOR
Subject AreaPhysics
DOI10.1016/j.physrep.2005.12.006
Indexed BySCI
Language英语
WOS SubjectPhysics, Multidisciplinary
WOS IDWOS:000236815000001
Citation statistics
Cited Times:955[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/212653
Collection实验物理中心
Affiliation中国科学院高能物理研究所
Recommended Citation
GB/T 7714
ALEPH Collaborat,DELPHI Collaborat,OPAL Collaborat,et al. Precision electroweak measurements on the Z resonance[J]. PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS,2006,427(5--6):257-454.
APA ALEPH Collaborat,DELPHI Collaborat,OPAL Collaborat,&SLD Collaborat;LEP ElectroweakWorking Group; SLD Electroweak and Heavy Flavour Groups.(2006).Precision electroweak measurements on the Z resonance.PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS,427(5--6),257-454.
MLA ALEPH Collaborat,et al."Precision electroweak measurements on the Z resonance".PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS 427.5--6(2006):257-454.
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