Experimental determination of the b quark mass in DELPHI
Abstract
The running mass of the b quark as defined in the MS-bar renormalization scheme, mb, was measured at the MZ scale using 2.8 million hadronic Z0 decays collected by the DELPHI experiment at LEP. The result is mb(MZ) = 2.67 +- 0.25 (stat.) +- 0.34 (frag.) +- 0.27(theo.) GeV/c2 which differs from that obtained at the Upsilon scale, by mb(M/2)-mb(MZ) = 1.49 +- 0.52 GeV/c2. This measurement, performed far from the bb production threshold, provides the first experimental observation of the running of the quark masses.
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