High precision tests of QCD at LEP
- IFIC, Centro Mixto Universitat de Valencia-CSIC, Doctor Moliner 50, E-46100 Burjassot, Valencia (Spain)
In this report, the latest measurements involving high precision tests of QCD at LEP are reviewed. The status of the strong coupling constant, {alpha}{sub s}, is discussed and summarized. The relative ratio of the normalized three-jet cross-section of b and light, l=u{sub 1}d,s, quarks has been determined by the DELPHI collaboration in agreement with the QCD prediction including NLO radiative corrections with mass effects. In this study the running b quark mass at the M{sub Z} scale has been measured providing the first experimental evidence of the running of the b quark mass. As a consequence of this study the flavour independence of {alpha}{sub s} for b and l quarks is established within 1% accuracy. The charged multiplicity of quark and gluon jets has been investigated for various three-jet event topologies and compared for different energy and transverse momentum-like scales. An increase of the gluon jet multiplicity with the scale was observed and this was twice as strong as the corresponding increase for quarks.
- OSTI ID:
- 21202145
- Journal Information:
- AIP Conference Proceedings, Vol. 444, Issue 1; Conference: 1. tropical workshop on particle physics and cosmology; 2. Latin American symposium on high energy physics, San Juan (Puerto Rico), 1-11 Apr 1998; Other Information: DOI: 10.1063/1.56616; (c) 1998 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ACCURACY
B QUARKS
COUPLING CONSTANTS
CROSS SECTIONS
ELECTRON-POSITRON INTERACTIONS
GLUONS
JET MODEL
LEP STORAGE RINGS
MULTIPLE PRODUCTION
MULTIPLICITY
QUANTUM CHROMODYNAMICS
RADIATIVE CORRECTIONS
REST MASS
S QUARKS
STRONG-COUPLING MODEL
TRANSVERSE MOMENTUM
Z NEUTRAL BOSONS