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# Measurement of the W-pair cross section in $e^+ e^-$ collisions at 172 GeV

Abstract : The e+e- --> W+W- cross section is measured in a data sample collected by ALEPH at a mean centre--of--mass energy of 172.09 GEV, corresponding to an integrated luminosity of 10.65 pb-1. Cross sections are given for the three topologies, fully leptonic, semi-leptonic and hadronic of a W-pair decay. Under the assumption that no other decay modes are present, the W-pair cross section is measured to be 11.7 +- 1.2 (stat.) +- 0.3 (syst.) pb. The existence of the triple gauge boson vertex of the Standard Model is clearly preferred by the data. The decay branching ratio of the W boson into hadrons is measured to be B(W --> hadrons) = 67.7 +- 3.1 (stat.) +- 0.7 (syst.)%, allowing a determination of the CKM matrix element |Vcs|= 0.98 +- 0.14 (stat.) +- 0.03 (syst.).
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http://hal.in2p3.fr/in2p3-00010776
Contributor : Hélène Kerec <>
Submitted on : Monday, March 8, 1999 - 11:57:26 AM
Last modification on : Monday, March 29, 2021 - 3:22:09 PM
Long-term archiving on: : Tuesday, June 2, 2015 - 12:11:24 PM

### Identifiers

• HAL Id : in2p3-00010776, version 1

### Citation

R. Barate, D. Buskulic, D. Decamp, P. Ghez, C. Goy, et al.. Measurement of the W-pair cross section in $e^+ e^-$ collisions at 172 GeV. Physics Letters B, Elsevier, 1997, 415, pp.435-444. ⟨in2p3-00010776⟩

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