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W pair production cross-section and W branching fractions in $e^{+}e^{-}$ interactions at 189 GeV / DELPHI Collaboration
The cross-section for the process $e^+e^-\rightarrow W^+W^-$has been measured with the data sample collected by DELPHIat an average centre-of-mass energy of 189~GeV andcorresponding to an integrated luminosity of 155~pb$^{-1}$. Based on the 2392 events selected as $WW$ candidates, the croedoubly resonant process $e^+e^-\rightarrow W^+W^-$ has been me$15.83 \pm 0.38~\mbox{(stat)} \pm 0.20~\mbox{(syst)~pb}$.The branching fractions of the $W$ decay were also measured ato be in good agreement with the Standard Model expectation.From these a value of the CKM mixing matrix element$ |V_{cs}| = 1.001 \pm 0.040~\mbox{(stat)} \pm 0.020~\mbox{(s$was derived..
hep-ex/0103013; CERN-EP-2000-035; CERN-EP-2000-035.- Geneva : CERN, 2000 - 16 p. - Published in : Phys. Lett. B 479 (2000) 89-100 Fulltext: ep-2000-035 - PDF; arXiv:hep-ex_0103013 - PDF; External link: Preprint - Please contact the library if you need to access this document.

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