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
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