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Measurements of \(R_{\rm b}\), \(A_{\rm FB}^{\rm b}\), and \(A_{\rm FB}^{\rm c}\) in \({\rm e^+ e^-}\) collisions at 130 – 189 GeV

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

Abstract.

The cross-section ratio \(R_{\mathrm{b}} = \sigma( \rm e^+ e^- \to{\rm b\overline{\rm b}} )/\sigma(\rm e^+ e^-\to{\mathrm q\bar{\mathrm q}} )\) and the bottom and charm forward-backward asymmetries \(A_{\mathrm{FB}}^{\mathrm{b}}\) and \(A_{\mathrm{FB}}^{\mathrm c}\) are 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 \(A_{\mathrm{FB}}^{\mathrm{b}}\). In addition, the bottom and charm asymmetries are measured using leptons from semileptonic decays of heavy hadrons and pions from \(\mathrm{D}^{*+}\to\rm D^0{\pi^+}\) decays. The results are in agreement with the Standard Model predictions.

Keywords

Model Prediction Opal Detector Event Sample Standard Model Prediction Bottom Quark 
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.

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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, Italy IT

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