Measurement of z0 gamma production in ppbar collisions at s**(1/2) = 1.96 TeV

The cross-section of p(bar p) → Z0γ + X production at √s = 1.96 TeV using the CDF II detector at the Fermilab Tevatron is measured using 202 pb-1 of data from March 2002 to September 2003, collected with high PT lepton triggers. The number of events observed and their kinematic distributions are compared to the NLO Standard Model prediction in both the Z0 → e+e- and Z0 → μ+μ- channels. For a minimum lepton-photon separation of ΔRlγ > 0.7, ETγ > 7 GeV and a dilepton invariant mass m(l,l) > 40 GeV/c2, the cross-section times branching ratio is measured to be 4.6 ± 0.5(stat) ± 0.2(sys) ± 0.3(lumi) pb compared to the NLO Standard Model prediction of 4.5 ± 0.3(th) pb