A measurement of the b-quark mass from hadronic Z decays
The ALEPH Collaboration
R. Barate - et al.
Laboratoire de Physique des Particules (LAPP), IN2P3-CNRS,
74019 Annecy-le-Vieux Cedex, France
Received: 6 July 2000 / Published online: 13 November 2000 - © Springer-Verlag 2000
Hadronic Z decay data taken with the ALEPH detector at LEP1 are used to measure the three-jet rate as well as moments of various event-shape variables. The ratios of the observables obtained from b-tagged events and from an inclusive sample are determined. The mass of the b quark is extracted from a fit to the measured ratios using a next-to-leading order prediction including mass effects. Taking the first moment of the y3 distribution, which is the observable with the smallest hadronization corrections and systematic uncertainties, the result is
The measured ratio is alternatively employed to test the flavour independence of the strong coupling constant for b and light quarks.
Copyright Società Italiana di Fisica, Springer-Verlag 2000