Study of neutral current four fermion and Z Z production in e+ e- collisions at S**(1/2) = 183-GeV

A study of neutral-current four-fermion processes is performed using a data sample corresponding to 55.3 pb −1 of integrated luminosity collected by the L3 detector at LEP at an average centre-of-mass energy of 183 GeV. The neutral-current four-fermion cross sections for final states with a pair of charged leptons plus jets and with four charged leptons are measured to be consistent with the Standard Model predictions. Events with fermion pair masses close to the Z boson mass are selected in all observable final states and the ZZ production cross section is measured to be σ ZZ =0.30 +0.22 +0.07 −0.16 −0.03 pb, in agreement with the Standard Model expectation. No evidence for the existence of anomalous triple gauge boson ZZZ and ZZ γ couplings is found and limits on these couplings are set.

electron positron: colliding beams
electron positron: annihilation
fermion: multiple production
final state: (4fermion)
Z0: pair production
Z0: leptonic decay
Z0: hadronic decay
channel cross section
coupling: (3Z0)
coupling: (2Z0 photon)

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