Measurement of hadron and lepton-pair production in e+ e- collisions at s**(1/2) = 192-GeV to 208-GeV at LEP.

L3 COLL., P. ACHARD , M.T.DOVA ET AL

EUROPEAN PHYSICAL JOURNAL C - PARTICLES AND FIELDS

elsevier

Año: 2006 vol. 47 p. 1 - 19

1434-6044

Hadron production and lepton-pair production in e+e- collisions are studied with data collected with the L3 detector at LEP at centre-of-mass energies sqrt{s}=192-208GeV. Using a total integrated luminosity of 453/pb, 36057 hadronic events and 12863 lepton-pair events are selected. The cross sections for hadron production and lepton-pair production are measured for the full sample and for events where no high-energy initial-state-radiation photon is emitted prior to the collisions. Lepton-pair events are further investigated and forward-backward asymmetries are measured. Finally, the differential cross sections for electron-positron pair-production is determined as a function of the scattering angle. An overall good agreement is found with Standard Model predictions.