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A measurement is presented of the phi to K+K- production cross section atsqrt(s) = 7 TeV using pp collision data corresponding to an integratedluminosity of 383 mub-1, collected with the ATLAS experiment at the LHC.Selection of phi(1020) mesons is based on the identification of charged kaonsby their energy loss in the pixel detector. The differential cross section ismeasured as a function of the transverse momentum, pTphi, and rapidity, |yphi|,of the phi(1020) meson in the fiducial region 500 < pTphi< 1200 MeV, |yphi| <0.8, kaon pTK> 230 MeV and kaon momentum pK< 800 MeV.The integratedphi(1020)-meson production cross section in this fiducial range is measured tobe s(phi K+K-) = 570 pm 8 (stat) pm 66 (syst) pm 20 (lumi) mub.

The differential production cross section of the phi(1020) meson in sqrt(s)=7 TeV pp collisions measured with the ATLAS detector