In this thesis I present a study of W pair production in e+e- annihilation usingfully hadronic W+W- events. Data collected by the L3 detector at LEP in 1996-1998, at collision center-of-mass energies between 161 and 189 GeV, was used in my analysis.
Analysis of the total and differential W+W- cross sections with the resultingsample of 1,932 W+W- → qqqq event candidates allowed me to make precision measurementsof a number of properties of the W boson. I combined my measurementswith those using other W+W- final states to obtain stringent constraints on the Wboson's couplings to fermions, other gauge bosons, and scalar Higgs field by measuringthe total e+e- → W+W- cross section and its energy dependence
σ(e+e- → W+W-) =
{2.68+0.98-0.67(stat.)± 0.14(syst.) pb,√s = 161.34 GeV
{12.04+1.38-1.29(stat.)± 0.23(syst.) pb, √s = 172.13 GeV
{16.45 ± 0.67(stat.) ± 0.26(syst.) pb,√s = 182.68 GeV
{16.28 ± 0.38(stat.) ± 0.26(syst.) pb,√s = 188.64 GeV
the fraction of W bosons decaying into hadrons
BR(W →qq') = 68.72 ± 0.69(stat.) ± 0.38(syst.) %,invisible non-SM width of the W boson
ΓinvisibleW less than MeV at 95% C.L.,the mass of the W boson
MW = 80.44 ± 0.08(stat.)± 0.06(syst.) GeV,the total width of the W boson
ΓW = 2.18 ± 0.20(stat.)± 0.11(syst.) GeV,the anomalous triple gauge boson couplings of the W
ΔgZ1 = 0.16+0.13-0.20(stat.) ± 0.11(syst.)
Δkγ = 0.26+0.24-0.33(stat.) ± 0.16(syst.)
λγ = 0.18+0.13-0.20(stat.) ± 0.11(syst.)
No significant deviations from Standard Model predictions were found in any ofthe measurements.
