A Measurement of the b-quark Mass from Hadronic Z Decays

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 y_3 distribution, which is the observable with the smallest hadronization corrections and systematic uncertainties, the result is m_b(M_Z) = [3.27 +- 0.22(stat) +- 0.22(exp) +- 0.38(had) +- 0.16(theo)] GeV/c2. The measured ratio is alternatively employed to test the flavour independence of the strong coupling constant for b and light quarks.
Document type :
Journal articles

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Submitted on : Monday, March 19, 2001 - 12:57:58 PM
Last modification on : Tuesday, April 20, 2021 - 12:00:04 PM

Citation

R. Barate, D. Decamp, P. Ghez, C. Goy, J P. Lees, et al.. A Measurement of the b-quark Mass from Hadronic Z Decays. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2000, 18, pp.1-13. ⟨in2p3-00007832⟩

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