Abstract : The production of W-pairs is analysed in a data samplecollected by ALEPH at a mean centre-of-mass energy of 188.6 GeV,corresponding to an integrated luminosity of 174.2 pb^-1. Crosssections are given for different topologies of W decays intoleptons or hadrons. Combining all final states and assumingStandard Model branching fractions, the total W-pair cross sectionis measured to be 15.71 +- 0.34 (stat) +- 0.18 (syst) pb.Using also the W-pair data samples collected by ALEPH at lowercentre-of-mass energies, the decay branching fraction of the W bosoninto hadrons is measured to be BR (W hadrons) = 66.97+- 0.65 (stat) +- 0.32 (syst) %, allowing a determination of theCKM matrix element |V(cs)|= 0.951 +- 0.030 (stat) +- 0.015 (syst).
http://hal.in2p3.fr/in2p3-00005380 Contributor : Claudine BOMBARConnect in order to contact the contributor Submitted on : Tuesday, August 1, 2000 - 11:33:13 AM Last modification on : Sunday, June 26, 2022 - 11:42:42 AM Long-term archiving on: : Monday, June 21, 2010 - 3:53:56 PM
R. Barate, D. Decamp, P. Ghez, C. Goy, S. Jezequel, et al.. Measurement of W-pair production in $e^+ e^-$ collisions at 189 GeV. Physics Letters B, Elsevier, 2000, 484, pp.205-217. ⟨in2p3-00005380⟩