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QCD measurements with heavy quarks at LEP

Abstract

Recent experimental results from LEP on strong interactions using heavy quarks are reviewed. By identifying bottom and charm decays, a model independent evidence for the string effect has been found together with a softer fragmentation function of gluons compared to quarks. The comparison of jet properties and the value of the strong coupling constant {alpha}{sub s} in bottom events and average events provides evidence for the flavour independence of QCD: {alpha}{sup b0tt0m}{sub s}/{alpha}{sub s}{sup udsc} = 1.00 {+-} 0.05 {+-} 0.06. The average scaled energy of charmed and bottom hadrons at Z{sup 0} energies is found to be <{chi}sub(D{sup +})> = 0.507{sup +0.012}{sub -0.015} {+-} 0.010 <{chi}sub(b{yields}l)> = 0.705 {+-} 0,008 {+-} 0.010. A comparison with results at lower c.m. energies exhibits significant scaling violations. These are interpreted in the context of various QCD calculations. (orig.).
Authors:
Publication Date:
Oct 01, 1991
Product Type:
Technical Report
Report Number:
BONN-HE-91-19; CONF-9106272-
Reference Number:
SCA: 662310; 662230; PA: DEN-92:000499; SN: 92000645378
Resource Relation:
Conference: 4. international symposium on heavy flavor physics,Orsay (France),25-29 Jun 1991; Other Information: PBD: Oct 1991
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ELECTRON-POSITRON INTERACTIONS; REVIEWS; ANNIHILATION; GEV RANGE 10-100; NEUTRAL-CURRENT INTERACTIONS; QUANTUM CHROMODYNAMICS; PROGRESS REPORT; Z NEUTRAL BOSONS; WEAK HADRONIC DECAY; HADRONS; MULTIPLE PRODUCTION; ENERGY DEPENDENCE; STRING MODELS; LIMITING FRAGMENTATION; BEAUTY PARTICLES; CHARM PARTICLES; GLUONS; QUARKS; SCALE INVARIANCE; SYMMETRY BREAKING; COUPLING CONSTANTS; STRONG INTERACTIONS; JET MODEL; FLAVOR MODEL; 662310; 662230; WEAK AND ELECTROMAGNETIC INTERACTIONS OF LEPTONS
OSTI ID:
10114353
Research Organizations:
Bonn Univ. (Germany). Physikalisches Inst.
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ON: DE92759080; TRN: DE9200499
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
DEN
Size:
12 p.
Announcement Date:
Jun 30, 2005

Citation Formats

Maettig, P. QCD measurements with heavy quarks at LEP. Germany: N. p., 1991. Web.
Maettig, P. QCD measurements with heavy quarks at LEP. Germany.
Maettig, P. 1991. "QCD measurements with heavy quarks at LEP." Germany.
@misc{etde_10114353,
title = {QCD measurements with heavy quarks at LEP}
author = {Maettig, P}
abstractNote = {Recent experimental results from LEP on strong interactions using heavy quarks are reviewed. By identifying bottom and charm decays, a model independent evidence for the string effect has been found together with a softer fragmentation function of gluons compared to quarks. The comparison of jet properties and the value of the strong coupling constant {alpha}{sub s} in bottom events and average events provides evidence for the flavour independence of QCD: {alpha}{sup b0tt0m}{sub s}/{alpha}{sub s}{sup udsc} = 1.00 {+-} 0.05 {+-} 0.06. The average scaled energy of charmed and bottom hadrons at Z{sup 0} energies is found to be <{chi}sub(D{sup +})> = 0.507{sup +0.012}{sub -0.015} {+-} 0.010 <{chi}sub(b{yields}l)> = 0.705 {+-} 0,008 {+-} 0.010. A comparison with results at lower c.m. energies exhibits significant scaling violations. These are interpreted in the context of various QCD calculations. (orig.).}
place = {Germany}
year = {1991}
month = {Oct}
}