Article
Studies of hadronic event structure and comparisons with QCD models at theZ0 resonance
III. Physikalisches Institut RWTH W5100 Aachen Germany
Zeitschrift für Physik C 02/1992; 55(1):3961. DOI: 10.1007/BF01558288 Fulltext
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Article: Tests of QCD at LEP
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ABSTRACT: The four experiments, ALEPH, DELPHI, L3 and OPAL at LEP, have performed a large number of precise measurements to test Quantum Chromodynamics. The strong coupling constant has been measured with high precision:α s (Mz) = 0.123±0.004. The coupling constant has been found to be independent of quark flavour. The running ofα s has been demonstrated by the data. Second order QCD matrix element calculations have been tested from several measured distributions in 3jet and 4jet events. These distributions give evidence of the vector nature of the gluon and provide measurements of the QCD colour factors. The hadronic distributions are well reproduced by QCD Monte Carlo programs as well as by analytical calculations with soft gluon coherence effects.Pramana 07/1993; 41:5574. DOI:10.1007/BF02908076 · 0.65 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: From 1 105 045 hadronic Z0 decays observed with the OPAL detector at the LEP e+e– collider, 21 732 fourjet events are selected. A simultaneous fit of three selected angular variables from these events by the second order QCD matrix element calculation yieldsC A /C F =2.110.16(stat.)0.28(syst.)T F /C F =0.400.11(stat.)0.14(syst.) for the ratios of colour factors, in agreement with SU(3) expectations ofC A /C F =9/4 andT F /C F =3/8.Zeitschrift für Physik C 08/1995; 65(3):367377. DOI:10.1007/BF01556127  [Show abstract] [Hide abstract]
ABSTRACT: We discuss two ways in which parton shower algorithms can be supplemented by matrixelement corrections to ensure the correct hard limit: by using complementary phasespace regions, or by modifying the shower itself. In the former case, existing algorithms are selfconsistent only if the total correction is small. In the latter case, existing algorithms are never selfconsistent, a problem that is particularly severe for angularordered parton shower algorithms. We show how to construct selfconsistent algorithms in both cases.Computer Physics Communications 09/1995; 90(190):95101. DOI:10.1016/00104655(95)00064M · 3.11 Impact Factor