Performance of the Opal Si-W Luminometer at Lep I-Ii

Abbiendi, G.; Kellogg, R. G.; Strom, D.

doi:10.1142/9789812704894_0032

Cited by 40 publications

(75 citation statements)

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“…Within errors, the full NLO calculation can describe the ZEUS data without any intrinsic ͗k T ͘ effects. The production of direct photons and jets in direct, single-, and double-resolved photon-photon collisions has also recently been calculated in next-to-leading order (Fontannaz, Guillet, and Heinrich, 2002), and good agreement with preliminary OPAL data (Abbiendi et al, 2001d) was found. In the future, NLO calculations should be performed for the production of two photons and photons in association with light and heavy hadrons in order to obtain more information about the flavor content of photons and protons.…”

Section: Photons and Jetssupporting

confidence: 61%

Theory of hard photoproduction

2002

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The present theoretical knowledge about photons and hard photoproduction processes, i.e. the production of jets, light and heavy hadrons, quarkonia, and prompt photons in photon-photon and photon-hadron collisions, is reviewed. Virtual and polarized photons and prompt photon production in hadron collisions are also discussed. The most important leading and next-to-leading order QCD results are compiled in analytic form. A large variety of numerical predictions is compared to data from TRISTAN, LEP, and HERA and extended to future electron and muon colliders. The sources of all relevant results are collected in a rich bibliography.Comment: Habilitationsschrift, scheduled for publication in Rev. Mod. Phys., 126 pages, 61 figure

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Section: Photons and Jetssupporting

confidence: 61%

Theory of hard photoproduction

2002

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“…The data is not published yet and will therefore not be considered in this presentation. The OPAL data used in this analysis was obtained by G. Abbiendi et al, members of the OPAL collaboration, at center-of-mass energy near the Z 0 peak of 91.5 GeV/c 2 [16].…”

Section: Datamentioning

confidence: 99%

QCD Analysis of Hadron Multiplicities from e+e−-annihilation and Determination of Fragmentation Functions

Francisconi

2010

Nuclear Physics B - Proceedings Supplements

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“…Its width is given by the total decay width of the W boson and the detector resolution. These distributions are analysed by the four LEP experiments in order to extract the pole mass and total decay width of the W boson [161,162,163,164], where a definition of mass and width using a Breit-Wigner with s-dependent width is used. The results of the experiments for the different channels and their combinations [156] are compared in Figures 1.39 and 1.40.…”

Section: Determination Of W-boson Mass and Widthmentioning

confidence: 99%

6 Experimental Precision Tests for the Electroweak Standard Model

Grünewald¹

2008

Theory and Experiments

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This paper contains a review of recent precision measurements of electroweak observables and resulting tests of the electroweak Standard Model. Invited Chapter for a Handbook of Particle Physics IntroductionThe last twenty years have seen enormous progress in experimental precision measurements in particle physics and tests of the electroweak Standard Model. New generations of experiments using advanced detectors at high-energy particle colliders perform measurements with a precision unprecedented in high-energy particle physics. This review summarises the major exciting experimental results measured at the highest energies and pertaining to the electroweak interaction.Comparisons with the theory, the Standard Model of particle physics (SM) [1], are used to test the theory and to constrain its free parameters. The data sets analysed for the precision measurements presented here have been accumulated at the world's highest-energy particle colliders over the last two decades. They verify the SM as a renormalisable field theory correctly describing nature. Electron-positron collisions at 91 GeV centre-of-mass energy were studied by the SLD detector [8], operating at Stanford's Linear Collider (SLC) [12] (1989-1998), and by the experiments ALEPH [13], DELPHI [15], L3 [17] and OPAL [21], taking data at the Large Electron Positron collider (LEP) [25] (1989-1995) at the European Laboratory for Particle Physics, CERN, Geneva, Switzerland. This centre-of-mass energy corresponds to the mass of the Z boson, the heavy neutral exchange particle of the electroweak interaction, which is thus produced in resonance, e + e − → Z. While SLC provided interactions at a fixed centre-of-mass energy corresponding to the maximum of the Z resonance cross section, the LEP-I collider provided collisions at several centre-of-mass energy points, thereby scanning the Z resonance lineshape in the range from 88 GeV to 94 GeV. By increasing the LEP center-of-mass energy up to 209 GeV (LEP-II, 1996, the precision measurements of Z-boson properties at LEP-I were complemented by measurements of the properties of the W-boson, the charged carrier of the electroweak interaction, in the reaction e + e − → W + W − at LEP-II. Proton-antiproton collisions are provided by the Tevatron collider operating at the Fermi Na-2 tional Accelerator Laboratory close to Chicago in the USA, at centre-of-mass energies of 1.8 TeV (Run-I, 1992(Run-I, -1996 and 2.0 TeV (Run-II, since 2001), and are studied by the experiments CDF [29] and DØ [30]. Results from the Tevatron experiments important for the electroweak interaction include measurements of the mass of the W boson, as well as the discovery of the sixth and heaviest quark known today, the top quark, in 1995 and the measurements of its properties, in particular its mass. In addition, key measurements were performed in dedicated experiments at lower interaction energies, notably the measurement of the anomalous magnetic moment of the muon [32], as well as the measurements of parity violation effects in a...

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Performance of the Opal Si-W Luminometer at Lep I-Ii

Abstract: A pair of compact Silicon-Tungsten calorimeters was operated in the OPAL experiment at LEP to measure the integrated luminosity from detection of Bhabha e ± scattered at small angles from the beam line. The performance of the detector at both LEP-I and LEP-II is reviewed.

Cited by 40 publications

References 1 publication

Theory of hard photoproduction

Theory of hard photoproduction

QCD Analysis of Hadron Multiplicities from e+e−-annihilation and Determination of Fragmentation Functions

6 Experimental Precision Tests for the Electroweak Standard Model

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