Measurement of the muonic cross section times branching ratio of the W boson and Z boson, the muonic ratio of W boson to Z boson and extraction of the muonic branching fraction of W bosons and W boson width in proton-antiproton collisions at 1.8 TeV.

Abstract

We analyze the production of high transverse momentum muons produced by the proton-antiproton colliding beams at the Fermilab Tevatron and detected by the Collider Detector at Fermilab. We measure the W and Z production cross sections times muon branching ratio at a pp center of mass energy of $\sqrt{s}$ = 1.8 TeV and determine: $\sigma(p\bar p\to W)\cdot B(W\to\mu\nu) = 2.521\pm 0.032(stat)\pm 0.106(syst)\pm 0.095(lum)\ nb$ and $\sigma(p\bar p\to Z)\cdot B(Z\to\mu\mu) = 0.1895\pm 0.0092(stat)\pm 0.0083(syst)\pm 0.0072(lum)\ nb$. The data set corresponds to an integrated luminosity of $\int\ {\cal L} = 18.82\pm 0.68\ pb\sp{-1}$. We also measure the ratio of these cross sections to be $R\sb\mu = \sigma\cdot B(W\to\mu\nu)/\sigma\cdot B(Z\to\mu\mu) = 13.30\pm 0.67(stat)\pm 0.42(syst)$. From $R\sb\mu$, we extract a value for the W muonic branching ratio: $B(W\to\mu\nu) = \Gamma(W\to\mu\nu)/\Gamma(W) = 0.1345\pm 0.0068(stat)\pm 0.0045(syst)$ and the total W width: $\Gamma(W) = 1.689\pm 0.085(stat)\pm 0.057(syst)\ GeV$. We use the branching ratio to look for unknown decay modes of the W. We compare the cross sections and W width to the recent theory predictions.