Advertisement

Measurements of inclusive semileptonic branching fractions of b hadrons in \(\boldmath Z^0z\) decays

  • The OPAL Collaboration
  • G. Abbiendi et al.
Experimental physics

Abstract.

A measurement of inclusive semileptonic branching fractions of b hadrons produced in Z\(^0\) decays is presented. An enriched Z\(^0 \to \mathrm{b \bar b}\) sample is obtained with a lifetime flavour-tagging technique. The leptonic events are then selected from this sample, and classified according to their origin, which is determined by comparing the distribution of several kinematic variables using artificial neural network techniques. Using 3.6 million multihadronic events collected with the OPAL detector at energies near the Z\(^0\) resonance, the values

\(\)

are measured, where b denotes all weakly decaying b hadrons and \(\ell\) represents either e or \(\mu\). The second error includes all experimental systematic uncertainties whereas the last error is due to uncertainties in modelling of the lepton momentum spectrum in semileptonic decays and b quark fragmentation. The average fraction of the beam energy carried by the weakly decaying b hadron, \(\langle x_E \rangle\), is measured to be

\(\)

where the modelling error is dominated by the choice of b fragmentation model. The agreement between data and various semileptonic decay models and fragmentation functions is also investigated.

Keywords

Neural Network Artificial Neural Network Modelling Error Beam Energy Systematic Uncertainty 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • The OPAL Collaboration
  • G. Abbiendi et al.
    • 1
  1. 1.Dipartimento di Fisica dell' Università di Bologna and INFN, 40126 Bologna, ItalyIT

Personalised recommendations