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 language||English (US)|
|Number of pages||10|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Dec 25 1997|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics