Measurement of the W-pair cross section in e+e- collisions at 172 GeV

ALEPH Collaboration

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The e+e- → W+W- cross section is measured in a data sample collected by ALEPH at a mean centre-of-mass energy of 172.09 GeV, corresponding to an integrated luminosity of 10.65 pb-1. Cross sections are given for the three topologies, fully leptonic, semi-leptonic and hadronic of a W-pair decay. Under the assumption that no other decay modes are present, the W-pair cross section is measured to be 11.7 ± 1.2(stat.) ± 0.3(syst.)pb. The existence of the triple gauge boson vertex of the Standard Model is clearly preferred by the data. The decay branching ratio of the W boson into hadrons is measured to be B(W → hadrons) = 67.7 ± 3.1(stat.) ± 0.7(syst.)%, allowing a determination of the CKM matrix element |Vcs = 0.98 ± 0.14(stat.) ± 0.03(syst.).

Original languageEnglish (US)
Pages (from-to)435-444
Number of pages10
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number4
StatePublished - Dec 25 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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