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Measurement of the Running b-Quark Mass Using e+e- --> b anti-bg Events


We have studied the determination of the running b-quark mass, mb(MZ), using Z0 decays into 3 or more hadronic jets. We calculated the ratio of greater-than-or-equal 3-jet fractions in e+e- --> b anti-b vs. e+e- --> ql anti-ql (ql = u or d or s) events at next-to-leading order in perturbative QCD using six different infra-red- and collinear-safe jet-finding algorithms. We compared with corresponding measurements from the SLD Collaboration and found a significant algorithm-dependence of the fitted mb(MZ) value. Our best estimate, taking correlations into account, is mb(MZ) = 2.52 ± 0.27(stat.) +0.33/-0.47(syst.) +0.54/-1.46(theor.) GeV/c2.

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