Measurement of $W$ pair cross-sections in $e^{+} e^{-}$ interactions at $\sqrt{s}$ = 172-GeV and $W$ decay branching fractions

We report on the measurement of W-boson pair-production with the L3 detector at LEP at an average centre-of-mass energy of 172.13 GeV. In a data sample corresponding to a total luminosity of 10.25 pb −1 we select 110 four-fermion events with pairs of hadronic jets or leptons with high invariant masses. Branching fractions of W decays into different fermion-antifermion pairs are determined with and without the assumption of charged-current lepton universality. The branching fraction for hadronic W decays is measured to be: B (W → hadrons) = 64.2 −3.8 +3.7 (stat.) ± 0.5 (syst.) %. Combining all final states the total cross section for W-pair production is measured to be: σ WW = 12.27 −1.32 +1.41 (stat.) ± 0.23 (syst.) pb. The results are in good agreement with the Standard Model.

electron positron: colliding beams
electron positron: annihilation
W: electroproduction
W: pair production
W: hadronic decay
W: branching ratio
W: leptonic decay
final state: (4fermion)
lepton: universality
channel cross section

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Figures(0)

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Measurement of WWW pair cross-sections in e+e−e^{+} e^{-}e+e− interactions at s\sqrt{s}s​ = 172-GeV and WWW decay branching fractions

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Measurement of $W$ pair cross-sections in $e^{+} e^{-}$ interactions at $\sqrt{s}$ = 172-GeV and $W$ decay branching fractions