Standard Model Electroweak Measurements at Lep
نویسنده
چکیده
Electron-positron collision allow a detailed investigation of the standard model (SM) thanks to their clean experimental conditions. The Large Electron-Positron collider (LEP) was operated at CERN for about 12 years (1989 2000) at increasing center of mass energies ( √ s): both at the Z pole ( √ s ≈ 91 GeV) and beyond ( √ s = 160-209 GeV). Its maximum instantaneous luminosity was 0.5-1 10 cm s with a 45 kHz bunch-crossing rate. The four LEP multi-purpose detectors (ALEPH, DELPHI, L3, OPAL) collected an integrated luminosity of about 1000 pb each (with about 700 pb beyond the Z pole ). These data correspond to about 4.5 million Z and about 11000 W pair events per experiment.
منابع مشابه
v 1 3 1 M ay 2 00 1 Electroweak Results from LEP and SLC and Tests of the Standard Model
An update of the electroweak measurements at LEP and SLC is presented. These measurements are used to perform precise tests of the Standard Model. A constraint on the Standard Model Higgs mass is obtained when the direct measurements of mtop and MW are included in the fit. A combination with the direct Higgs search is also shown.
متن کاملFor Publisher’s use ELECTROWEAK MEASUREMENTS
The measurements of electroweak sector of the Standard Model are presented, including most recent results from LEP, Tevatron and HERA colliders. The robustness of the Standard Model is illustrated with the precision measurements, the electroweak fits and the comparisons to the results obtained from low energy experiments. The status of the measurements of the W boson properties and rare product...
متن کاملPrecision Electroweak Tests of the Standard Model
The present status of precision electroweak data is reviewed. These data include measurements of ee → ff , taken at the Z resonance at LEP, which are used to determine the mass and width of the Z boson. In addition, measurements have also been made of the forward-backward asymmetries for leptons and heavy quarks, and also the final state polarisation of the τ -lepton. At SLAC, where the electro...
متن کاملTests of the Standard Model at Lep
Measurements made by the four LEP experiments of electroweak parameters and the strong couphng constant are presented. These are used in an overaU Standard Model fit and a constraint on the mass of the top quark is derived. 1. Precision Measurements of Electroweak Parameters During 1989, 1990 and 1991 the four main experiments at the LEP e+ecollider (ALEPH, DELPHI, L3 and OPAL) have recorded da...
متن کاملPrecision Measurements at Lep and Lep-2
The status of the LEP precision measurements is reviewed, covering the electroweak measurements at the Z0, the studies of fermion pair production, and the totally new subject of W physics at LEP-2. The results presented here include both published and preliminary ones. These precision results are used to check the overall consistency of the Standard Model, and in its framework, constraints on i...
متن کاملPrecision Tests of Electroweak Interactions * Arif Akhundov
The status of the precision tests of the electroweak interactions is reviewed in this paper. An emphasis is put on the Standard Model analysis based on measurements at LEP/SLC and the Tevatron. The results of the measurements of the electroweak mixing angle in the NuTeV experiment and the future prospects are discussed.
متن کامل