Elsevier

Physics Letters B

Volume 516, Issues 1–2, 6 September 2001, Pages 1-20
Physics Letters B

Angular analysis of the muon pair asymmetry at LEP 1

https://doi.org/10.1016/S0370-2693(01)00896-6Get rights and content
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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.

Cited by (0)

1

And at TRIUMF, Vancouver, Canada V6T 2A3.

2

And Royal Society University Research Fellow.

7

And Research Institute for Particle and Nuclear Physics, Budapest, Hungary.

3

And Institute of Nuclear Research, Debrecen, Hungary.

10

And CERN, EP Div, 1211 Geneva 23.

11

And Tel Aviv University, School of Physics and Astronomy, Tel Aviv 69978, Israel.

6

And MPI München.

8

Now at University of Liverpool, Dept. of Physics, Liverpool L69 3BX, UK.

4

And Heisenberg Fellow.

5

And Department of Experimental Physics, Lajos Kossuth University, Debrecen, Hungary.

9

And University of California, Riverside, High Energy Physics Group, CA 92521, USA.