Measurement of muon pair production at 50-GeV < s**(1/2) < 86-GeV at LEP

Using the data recorded with the L3 detector at LEP, we study the process e + e − → μ + μ − ( γ ) for events with hard initial-state photon radiation. The effective centre-of-mass energies of the muons range from 50 GeV to 86 GeV. The data sample corresponds to an integrated luminosity of 103.5 pb −1 and yields 293 muon-pair events with a hard photon along the beam direction. The events are used to determine the cross sections and the forward-backward charge asymmetries at centre-of-mass energies below the Z resonance.

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
muon: pair production
pair production: muon
photon: radiation
initial-state interaction: bremsstrahlung
bremsstrahlung: initial-state interaction
energy spectrum: (muon+ muon-)

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