Abstract
A study of WZ production in proton-proton collisions at sqrt(s) = 7 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 sigma_WZ(tot) = 19.0+1.4/-1.3(stat.)+/-0.9(syst.)+/-0.4(lumi.) pb, consistent with the Standard Model expectation of 17.6+1.1/-1.0 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.
Highlights
The underlying structure of electroweak interactions in the Standard Model (SM) is the non-abelian SU(2)L × U (1)Y gauge group
This paper presents measurements of the W ±Z production cros√s-section with the ATLAS detector in pp collisions at s = 7 TeV
The analysis considers four channels of double-leptonic decays W ±Z → ±ν + − involving electrons and muons, i.e. e±e+e−, μ±e+e−, e±μ+μ− and μ±μ+μ−, plus large missing transverse momentum
Summary
The underlying structure of electroweak interactions in the Standard Model (SM) is the non-abelian SU(2)L × U (1)Y gauge group This model has been very successful in describing measurements to date. In√proton-proton (pp) collisions at a ergy s = 7 TeV, the SM cross-section centre-of-mass enfor W ±Z production is predicted at NLO to be 17.6+−11..10 pb. This has been computed for 66 < m < 116 GeV, where m is the invariant mass of the dilepton system from the Z boson decay, using MCFM [4] with the CT10 [5] parton distribution functions (PDFs). For the W ±Z events that pass all selection criteria, the trigger efficiency is in the range of (96–99) % depending on the final state being considered
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