Measurement of neutral current four fermion production at LEP-2

Four-fermion final states q q ̄ e + e − and q q ̄ μ + μ − from neutral-current interactions in e + e − collisions are studied in the OPAL detector at LEP at centre-of-mass energies from 183 GeV to 209 GeV. The data analysed correspond to a total integrated luminosity of about 650 pb −1 recorded from 1997 to 2000. Corresponding to the acceptance of the OPAL detector, a signal definition is applied requiring both leptons to have a scattering angle satisfying |cos θ |<0.95. Further requirements are made on the invariant masses of the fermion pairs. The extracted cross-sections for the processes e + e − → q q ̄ e + e − and e + e − → q q ̄ μ + μ − are consistent with the expectations from the Standard Model.

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20 pages, 6 figures, Submitted to Physics Letters B

electron positron: colliding beams
electron positron: annihilation
neutral current
lepton: multiple production
quark: pair production
final state: (4fermion)
lepton: angular distribution
quark antiquark: mass spectrum
mass spectrum: dilepton
channel cross section: energy dependence

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