CERN Accelerating science

Article
Report number CERN-PPE-97-102
Title Measurement of the W-pair cross section in e+e collisions at 172 GeV
Author(s) ALEPH Collaboration  Show all 396 authors
Publication 1997
Imprint 29 Jul 1997
Number of pages 15
Series (ALEPH Papers)
In: Phys. Lett. B 415 (1997) 435-444
DOI 10.1016/S0370-2693(97)01266-5
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LEP ; ALEPH
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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 Záznam vytvorený 1997-08-07, zmenený 2018-09-24


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