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European Physical Journal C: Particles and Fields
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Determination of the b quark mass at the Z mass scale

Authors: Stephen Lloyd; A. Macchiolo; R. J. Hemingway; Klaus Desch; C. Y. Chang; F. Meijers; P. Ferrari; +193 Authors

Determination of the b quark mass at the Z mass scale

Abstract

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

Countries
Germany, United Kingdom, Italy, Germany, Germany, Germany
Keywords

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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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
28
Top 10%
Top 10%
Top 10%
Green
gold