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

Research output: Contribution to journalJournal article

Published

Journal publication date1997
JournalPhysics Letters B
Journal number4
Volume415
Number of pages10
Pages435-444
Original languageEnglish

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 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 , allowing a determination of the CKM matrix element |Vcs|=0.98±0.14(stat.)±0.03(syst.).