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## W pair production cross-section and W branching fractions in $e^+ e^-$ interactions at 189 GeV

### Abstract

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

Topics: electronic publishing, neteconomy, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex]
Publisher: Elsevier
Year: 2000
OAI identifier: oai:HAL:in2p3-00004721v1
Provided by: Hal-Diderot