Measurements of inclusiveWandZcross sections in p\overline{p} collisions at \sqrt{s} = 1\hbox{.}96\, {{\rm TeV}}

Abstract

We report the first measurements of inclusive W and Z boson cross sections times the corresponding leptonic branching ratios for pp collisions at √ s = 1.96 TeV based on the decays of the W and Z bosons into electrons and muons. The data were recorded with the CDF II detector at the Fermilab 4Tevatron and correspond to an integrated luminosity of 72.0 ± 4.3 pb −1 . We test e-µ lepton universality in W decays by measuring the ratio of the W → µν to W → eν cross sections and determine a value of 0.991 ± 0.004(stat.) ± 0.011(syst.) for the ratio of W −ℓ−ν couplings (gµ/ge). Since there is no sign of non-universality, we combine our cross section measurements in the different lepton decay modes and obtain σW ×Br(pp → W → ℓν) = 2.749 ± 0.010(stat.) ± 0.053(syst.) ± 0.165(lum.) nb and σ γ * /Z × Br(pp → γ * /Z → ℓℓ) = 254.9 ± 3.3(stat.) ± 4.6(syst.) ± 15.2(lum.) pb for dilepton pairs in the mass range between 66 GeV/c 2 and 116 GeV/c 2 . We compute the ratio R of the W → ℓν to Z → ℓℓ cross sections taking all correlations among channels into account and obtain R = 10.84 ± 0.15(stat.) ± 0.14(syst.) including a correction for the virtual photon exchange component in our measured γ * /Z → ℓℓ cross section. Based on the measured value of R, we extract values for the W leptonic branching ratio, Br(W → ℓν) = 0.1082 ± 0.0022; the total width of the W boson, Γ(W ) = 2092 ± 42 MeV; and the ratio of W and Z boson total widths, Γ(W )/Γ(Z) = 0.838 ± 0.017. In addition, we use our extracted value of Γ(W ) whose value depends on various electroweak parameters and certain CKM matrix elements to constrain the Vcs CKM matrix element, |Vcs| = 0.976± 0.030.

Measurement of theW+W−Production Cross Section and Search for AnomalousWWγandWWAaltonen1, Adelman2, Amerio3 et al. 2010Phys. Rev. Lett.641240View full textAdd to dashboardCite

“…In the CDF II detector [10], a particle's direction is characterized by the azimuthal angle and the pseudorapidity ¼ À ln½tanð =2Þ , where is the polar angle measured from the proton beam direction. The transverse energy E T is defined as E sin , where E is the energy in the calorimeter towers associated with a cluster of energy deposition.…”

Measurement of the inclusive-isolated prompt-photon cross section in pp¯ collisions using the full CDF data set

“…The uncertainty from the energy scale introduces an uncertainty on the measured cross section that varies between ≈3% and ≈8% as E γ T increases. Finally, there is an additional 6% uncertainty on the integrated luminosity [45].…”

Invariant-mass distribution of jet pairs produced in association with aWboson inpp¯collisions atAaltonen1, Amerio2, Amidei3 et al. 2014Phys. Rev. D7030View full textAdd to dashboardCite

“…Details on the CDF II detector and the event reconstruction are described elsewhere [10]. The detector is cylindrically symmetric around the z direction, which is oriented along the proton beam axis.…”