Measurement of W-pair production in e+e- collisions at 189GeV

Details Measurement of W-pair production in e+e- collisions at 189GeV Measurement of W-pair production in e+e- collisions at 189GeV

2000-05-29

arxiv.org/abs/hep-ex/0005043v1

Phys.Lett.B484:205-217,2000

Physics

High Energy Physics

High Energy Physics - Experiment

14 pages, 5 figures

Scientific paper

10.1016/S0370-2693(00)00624-9

The production of W-pairs is analysed in a data sample collected by ALEPH at a mean centre-of-mass energy of 188.6 GeV, corresponding to an integrated luminosity of 174.2 pb^-1. Cross sections are given for different topologies of W decays into leptons or hadrons. Combining all final states and assuming Standard Model branching fractions, the total W-pair cross section is measured to be 15.71 +- 0.34 (stat) +- 0.18 (syst) pb. Using also the W-pair data samples collected by ALEPH at lower centre-of-mass energies, the decay branching fraction of the W boson into hadrons is measured to be BR (W > hadrons) = 66.97 +- 0.65 (stat) +- 0.32 (syst) %, allowing a determination of the CKM matrix element |V(cs)|= 0.951 +- 0.030 (stat) +- 0.015 (syst).

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