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Determination of the b quark mass at the Z mass scale

handle: 11587/332027
In hadronic decays of Z bosons recorded with the OPAL detector at LEP, events containing b quarks were selected using the long lifetime of b flavoured hadrons. Comparing the 3-jet rate in b events with that in d,u,s and c quark events, a significant difference was observed. Using Order(alpha_s squared) calculations for massive quarks, this difference was used to determine the b quark mass in the MSbar renormalisation scheme at the scale of the Z boson mass. By combining the results from seven different jet finders the running b quark mass was determined to be mb(MZ) = (2.67 +/- 0.03(stat) +0.29/-0.37(syst) +/- 0.19(theo.)) GeV. Evolving this value to the b quark mass scale itself yields mb(mb) = (3.95 +0.52/-0.62) GeV, consistent with results obtained at the b quark production threshold. This determination confirms the QCD expectation of a scale dependent quark mass. A constant mass is ruled out by 3.9 standard deviations.
26 pages, 7 figures, Submitted to Eur.Phys.J.C
- University of Tokyo Japan
- University of Salford United Kingdom
- Alma Mater Studiorum University of Bologna Italy
- University of Freiburg Germany
- University College London United Kingdom
FOS: Physical sciences, electron positron: annihilation, yield: (3jet), energy dependence, High Energy Physics - Experiment, dependence: flavor, High Energy Physics - Experiment (hep-ex), info:eu-repo/classification/ddc/530, Z0: hadronic decay, jet: particle identification, tables, OPAL, bibliography, CERN LEP Stor, electron positron: colliding beams, approx. 91 GeV-cms, quark: pair production, mass: bottom, Particle Physics - Experiment, Z0: electroproduction, experimental results
FOS: Physical sciences, electron positron: annihilation, yield: (3jet), energy dependence, High Energy Physics - Experiment, dependence: flavor, High Energy Physics - Experiment (hep-ex), info:eu-repo/classification/ddc/530, Z0: hadronic decay, jet: particle identification, tables, OPAL, bibliography, CERN LEP Stor, electron positron: colliding beams, approx. 91 GeV-cms, quark: pair production, mass: bottom, Particle Physics - Experiment, Z0: electroproduction, experimental results
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