W pair production cross-section and W branching fractions in e+e− interactions at 183 GeV

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Treille ,F Verbeure ,S Marti-Garcia ,C Bérat ,G Barbiellini ,A Deghorain ,B Åsman ,V Nomokonov ,W Bonivento ,P Lutz ,G Sajot ,A Ferrer ,S Navas ,G Zumerle

doi:10.1016/s0370-2693(99)00488-8

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 182.65 GeV and corresponding to an integrated luminosity of 53 pb −1. Based on the 770 events selected as WW candidates, the cross-section for the doubly resonant process σ(e +e −→W +W −)=15.86 ±0.69 (stat) ±0.26 (syst) pb has been measured and found to be in good agreement with the Standard Model expectation. The branching fractions of the W decay were also measured. From these a value of the CKM mixing matrix element |V cs|=0.985±0.073 (stat)±0.025 (syst) was derived. Our previously published WW cross-section measurements and the derived measurement of m W have been revised and updated with the present cross-section measurement to yield m W=80.49±0.43 (stat)±0.09( syst)±0.03( LEP) GeV/c 2 .

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