# OPAL Miscellaneous

2009-07-28
04:52
 OPAL and More / Giacomelli, G (Bologna U. ; INFN, Bologna) ; Giacomelli, P (INFN, Bologna) We shall summarize some of the research activities performed in collaboration with Ben Shen in the OPAL experiment at LEP and in the CMS experiment at the LHC. [...] arXiv:0907.4632. - 2009. Preprint

2005-01-22
06:02
 Precision tests of the standard model in LEP experiments / Olshevskii, A G (Joint Inst for Nucl Res, Dubna, Russia) Measurements performed in experiments at LEP are presented. The combined measurements are in good agreement with the theoretical predictions. [...] 2003 - Published in : Phys. Part. Nucl. 34 (2003) 557-76

2005-01-22
06:02
 Investigation of induced radioactivity in the CERN Large Electron Positron collider for its decommissioning / Silari, Marco ; Ulrici, Luisa The future installation of the Large Hadron Collider in the tunnel formerly housing the Large Electron Positron collider (LEP) required the dismantling of the latter after 11-year operation. As required by the French legislation, an extensive theoretical study was conducted before decommissioning to establish the possible activation paths both in the accelerator and in the four experiments (L3, ALEPH, OPAL and DELPHI) installed around the ring. [...] 2004 - Published in : Nucl. Instrum. Methods Phys. Res., A 526 (2004) 510-536

2004-01-22
01:16
 Review of the Properties of the W Boson at LEP, and the Precision Determination of its Mass / Ströhmer, R (Munich U.) We review the precision measurement of the mass and couplings of the W Boson at LEP. The total and differential W+W- cross section is used to extract the WWZ and WWgamma couplings. [...] hep-ph/0401146.- 2003 - 97 p. - Published in : Int. J. Mod. Phys. A 18 (2003) 5127-5220 Access to fulltext document: PDF; External link: hep-ph/0401146 PDF

2003-06-18
12:39
 Quarks and gluons : tests of QCD in $e^{+}e^{-}$ annihilations / Duchesneau, D ; Field, J H ; Jeremie, H This article gives an overview of the main experimental tests of perturbative QCD performed at LEP. It covers the following topics: determination of alpha /sub s/ from event shapes, tests of flavour independence of alpha /sub s/, studies of heavy quark mass effects, differences between quark and gluon jet fragmentation and study of the triple gluon vertex. [...] 2002 - Published in : C. R. Acad. Sci. Paris: 3 (2002) , no. 9, pp. 1211-22

2003-06-18
12:39
 High spatial resolution detectors and particle lifetime measurements at LEP / Coyle, P ; Schneider, O The design and performance of the LEP Si vertex detectors are described. Their application to the measurement of the tau -lepton and b-hadron lifetimes is discussed and the current status of these measurements is reviewed. [...] 2002 - Published in : C. R. Acad. Sci. Paris: 3 (2002) , no. 4, pp. 1143-54 Fulltext: PDF;

2003-06-18
12:39
 Direct search for the standard model Higgs boson / Janot, Patrick (CERN) ; Kado, M For twelve years, LEP revolutionized the knowledge of electroweak symmetry breaking within the standard model, and the direct discovery of the Higgs boson would have been the crowning achievement. Searches at the Z resonance and above the W/sup +/W/sup -/ threshold allowed an unambiguous lower limit on the mass of the standard model Higgs boson to set be at 114.1 GeV.c/sup -2/. [...] 2002 - Published in : C. R. Acad. Sci. Paris: 3 (2002) , no. 4, pp. 1193-1202

2003-06-18
12:34
 The LEP detectors / Callot, O ; Charpentier, P This article describes the four detectors which took data at LEP from 1989 to 2000. After a review of the design requirements and of the various answers, a more detailed description is given of some of the important detector components. [...] 2002 - Published in : C. R. Acad. Sci., 4: 3 (2002) , no. 9, pp. 1131-41

2003-06-18
12:34
 The number of neutrinos and the Z line shape / Blondel, A (Faculte des Sci) Thanks to a precise calibration and monitoring of the LEP beam energy the Z resonance line shape has been precisely measured, hence permitting accurate determinations of the Z mass and width. A large effort was spent on experiments for the measurement of the LEP luminosity, enabling the number of neutrino types to be precisely determined. [...] 2002 - Published in : C. R. Acad. Sci., 4: 3 (2002) , no. 9, pp. 1155-64

2003-06-18
12:29
 Coherence effects and perturbative QCD tests with the OPAL detector at LEP / Boutemeur, M (Munich U.) I report on results and methods from a set of analyses performed within the OPAL collaboration at CERN. The full available data sample collected at and near the Z/sup 0/ resonance is used. [...] 2002 - Published in : Fortschr. Phys. 50 (2002) 1001-1250