Measurement of W±Z production in proton-proton collisions at ?s
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文摘
A study of W ± Z production in proton-proton collisions at ?s = 7 TeV\sqrt{s} = 7~\mbox{TeV} is presented using data corresponding to an integrated luminosity of 4.6 fb?1 collected with the ATLAS detector at the Large Hadron Collider in 2011. In total, 317 candidates, with a background expectation of 68±10 events, are observed in double-leptonic decay final states with electrons, muons and missing transverse momentum. The total cross-section is determined to be sWZtot = 19.0+1.4-1.3\text(stat.)±0.9\text(syst.)±0.4\text(lumi.) pb\sigma _{WZ}^{\mathrm {tot}}= 19.0^{+1.4}_{-1.3}\text{(stat.)}\pm0.9\text{(syst.)}\pm 0.4\text{(lumi.)}~\mbox{pb}, consistent with the Standard Model expectation of 17.6+1.1-1.0 pb17.6^{+1.1}_{-1.0}~\mbox{pb}. Limits on anomalous triple gauge boson couplings are derived using the transverse momentum spectrum of Z bosons in the selected events. The cross-section is also presented as a function of Z boson transverse momentum and diboson invariant mass.

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