Measurement of the Cross Section of W-boson pair production at LEP

Details Measurement of the Cross Section of W-boson pair production at LEP Measurement of the Cross Section of W-boson pair production at LEP

2004-09-03

arxiv.org/abs/hep-ex/0409016v1

Phys.Lett.B600:22-40,2004

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1016/j.physletb.2004.08.060

The cross section of W-boson pair-production is measured with the L3 detector at LEP. In a data sample corresponding to a total luminosity of 629.4/pb, collected at centre-of-mass energies ranging from 189 to 209 GeV, 9834 four-fermion events with W bosons decaying into hadrons or leptons are selected. The total cross section is measured with a precision of 1.4 % and agrees with the Standard Model expectation. Assuming charged-lepton universality, the branching fraction for hadronic W-boson decays is measured to be: Br(W-->hadrons) = 67.50 +- 0.42 (stat.) +- 0.30(syst.) %, in agreement with the Standard Model. Differential cross sections as a function of the W- production angle are also measured for the semi-leptonic channels qqev and qqmv.

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