# 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.
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Journal articles

Cited literature [5 references]

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Contributor : Sylvie Flores <>
Submitted on : Wednesday, June 14, 2000 - 3:09:12 PM
Last modification on : Monday, March 29, 2021 - 3:22:08 PM
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### Identifiers

• HAL Id : in2p3-00004721, version 1

### Citation

P. Abreu, W. Adam, T. Adye, P. Adzic, Z. Albrecht, et al.. W pair production cross-section and W branching fractions in $e^+ e^-$ interactions at 189 GeV. Physics Letters B, Elsevier, 2000, 479, pp.89-100. ⟨in2p3-00004721⟩

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