Eur. Phys. J. C 24, 177-191 (2002)
DOI: 10.1007/s100520200950
Measurement of the forward-backward asymmetry
in
and
decays with leptons
The ALEPH Collaboration (Received: 7 January 2002 / Published online: 26 April 2002 - © Springer-Verlag / Società Italiana di Fisica 2002 )
Abstract
The sample of hadronic Z decays collected by the ALEPH detector
at LEP in the years 1991-1995 is analysed in order to measure
the forward-backward asymmetry in
and
events and
the
average mixing parameter
. Quark
charges are tagged by the charges of electrons and muons produced in
b and
c semileptonic decays. Multivariate analyses are used
to separate the event flavours and
/
processes. The
b
and
c quark asymmetries are measured simultaneously; the average
mixing parameter and the pole asymmetries are determined to be

These asymmetries, combined with the ALEPH measurements of the b asymmetry using inclusive b hadron decays and of the c asymmetry using reconstructed D mesons, correspond to a value of the effective electroweak mixing angle of

© Società Italiana di Fisica, Springer-Verlag 2002