Angular Analysis of the Muon Pair Asymmetry at LEP 1
The OPAL collaboration, G. Abbiendi, et al
TL;DR
This paper analyzes muon pair production data from LEP 1 to measure the forward-backward asymmetry and extract Z boson couplings, accounting for radiation effects, providing model-independent insights into electroweak interactions.
Contribution
It introduces a model-independent method to measure asymmetry dependence on invariant mass and determines Z boson couplings from LEP 1 data.
Findings
Measured asymmetry dependence on invariant mass.
Determined effective Z boson couplings.
Compared couplings with Standard Model predictions.
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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