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 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.
A measurement of the b-quark mass from hadronic Z decays / R. Barate et al.;V.Ciulli; E. Focardi. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - ELETTRONICO. - 18:(2000), pp. 1-13. [10.1007/s100520000533]
A measurement of the b-quark mass from hadronic Z decays
CIULLI, VITALIANO;FOCARDI, ETTORE
2000
Abstract
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 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.
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