DOI 10.1007/s100520000533
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
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
y3 distribution, which is the observable with
the smallest hadronization corrections and systematic uncertainties,
the result is
![\begin{displaymath}m_b(M_{\mathrm Z}) = \left[3.27 \,\pm\,0.22 (\mathrm{stat})
\...
...)\right]
\;{\ifmmode \mathrm{GeV}/c^2\else GeV/$c^2$\fi}\quad.\end{displaymath}](/articles/epjc/abs/2000/22/epjc0533/img4.gif){kind=small}
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
