MEASUREMENT OF THE PRODUCTION AND MUONIC DECAY-RATE OF W AND Z BOSONS IN P(P)BAR COLLISIONS AT ROOT-S = 1.8 TEV

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doi:10.1103/PhysRevLett.69.28

An analysis of proton-antiproton collisions at square-root s = 1.8 TeV recorded with the Collider Detector at Fermilab (CDF) yields sigma(ppBAR --> WX)B(W --> mu-nu) = 2.21 +/- 0.22 nb and sigma(ppBAR --> ZX)B(Z --> mu+mu-) = 0.226 +/- 0.032 nb. The ratio is R(mu) = sigma(W)B(W --> mu-nu)/sigma(Z)B(Z --> mu+mu-) = 9.8 +/- 1.2. Combining with previous CDF electron results gives sigma(W)B(W --> l-nu) = 2.20 +/- 0.20 nb, sigma(Z)B(Z- l+l-) = 0.214 +/- 0.023 nb, and R(l) = 10.0 +/- 0.8. We extract the ratios of the coupling constants g(mu)/g(e) and g(tau)/g(mu). Using standard model assumptions we deduce the inverse branching ratio B-1(W --> l-nu), the width GAMMA(W), and a decay-mode-independent lower bound on the top quark mass of 45 GeV/c2 (95% C.L.).