DOI 10.1007/s100520000387
Measurements of
Rb,
AFBb, and
AFBc
in
collisions at 130 - 189 GeV
The OPAL Collaboration
G. Abbiendi
- et al.
Dipartimento di Fisica dell' Università di Bologna and INFN,
40126 Bologna, Italy
Received: 29 November 1999 / Published online: 8 May 2000 - © Springer-Verlag 2000
Abstract
The cross-section ratio
and the bottom and charm
forward-backward asymmetries
AFBb and
AFBcare measured using event samples collected by the OPAL detector
at centre-of-mass energies between 130 and 189 GeV.
Events with bottom quark production are selected with
a secondary vertex tag, and a hemisphere charge algorithm is used to
extract
AFBb.
In addition, the bottom and charm
asymmetries are measured using leptons from semileptonic decays of heavy
hadrons and pions from
decays.
The results are in agreement with the Standard Model predictions.
Copyright Società Italiana di Fisica, Springer-Verlag 2000