Author/Authors :
DELPHI Collaboration، نويسنده , , P. Abreu، نويسنده , , W. Adam، نويسنده , , T. Adye، نويسنده , , P. Adzic، نويسنده , , Z. Albrecht، نويسنده , , T. Alderweireld، نويسنده , , G.D. Alekseev، نويسنده , , R. Alemany، نويسنده , , T. Allmendinger، نويسنده , , P.P. Allport، نويسنده , , S. Almehed، نويسنده , , U. Amaldi، نويسنده , , N. Amapane، نويسنده , , S. Amato، نويسنده , , E.G Anassontzis، نويسنده , , P. Andersson، نويسنده , , A. Andreazza، نويسنده , , S. Andringa، نويسنده , , P. Antilogus، نويسنده , , et al.، نويسنده ,
Abstract :
The cross-section for the process e+e−→W+W− has been measured with the data sample collected by DELPHI at an average centre-of-mass energy of 189 GeV and corresponding to an integrated luminosity of 155 pb−1. Based on the 2392 events selected as WW candidates, the cross-section for the doubly resonant process e+e−→W+W− has been measured to be 15.83±0.38 (stat)±0.20 (syst) pb. The branching fractions of the W decay were also measured and found to be in good agreement with the Standard Model expectation. From these a value of the CKM mixing matrix element |Vcs|=1.001±0.040 (stat)±0.020 (syst) was derived.
