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Angular analysis of the muon pair asymmetry at LEP 1

Authors
Journal
Physics Letters B
0370-2693
Publisher
Elsevier
Publication Date
Volume
516
Identifiers
DOI: 10.1016/s0370-2693(01)00896-6
Keywords
  • Experiments
Disciplines
  • Physics

Abstract

Abstract Data on muon pair production obtained by the OPAL Collaboration at centre of mass energies near the Z peak are analysed. Small angular mismatches between the directions of the two muons are used to assess the effects of initial state photon radiation and initial-final-state radiation interference on the forward–backward asymmetry of muon pairs. The dependence of the asymmetry on the invariant mass of the pair is measured in a model-independent way. Effective vector and axial-vector couplings of the Z boson are determined and compared to the Standard Model expectations.

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