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Measurement of the cross section of W-boson pair production at LEP

CollaborationWith : Achard, Pablo / Bourquin, Maurice / Braccini, Saverio / Chamizo Llatas, Maria / Deglon, Patrick / Delmeire, Evelyne / Echenard, Bertrand / Extermann, Pierre / Field, John / Kienzle, Maria-Novella / Natale, Sonia / Pohl, Martin / Straessner, Arno
Published in Physics Letters. B. 2004, vol. 600, no. 1-2, p. 22-40
Abstract The cross section of W-boson pair-production is measured with the L3 detector at LEP. In a data sample corresponding to a total luminosity of 629.4 pb−1, collected at centre-of-mass energies ranging from 189 to 209 GeV, 9834 four-fermion events with W bosons decaying into hadrons or leptons are selected. The total cross section is measured with a precision of 1.4% and agrees with the Standard Model expectation. Assuming charged-lepton universality, the branching fraction for hadronic W-boson decays is measured to be: Br(W→hadrons)=67.50±0.42(stat.)±0.30(syst.)%Br(W→hadrons)=67.50±0.42(stat.)±0.30(syst.)%, in agreement with the Standard Model. Differential cross sections as a function of the W− production angle are also measured for the semi-leptonic channels qqeν and qqμν.
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L3 COLLABORATION. Measurement of the cross section of W-boson pair production at LEP. In: Physics Letters. B, 2004, vol. 600, n° 1-2, p. 22-40. https://archive-ouverte.unige.ch/unige:42273

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Deposited on : 2014-11-28

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