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We present a measurement of two-particle angular correlations inproton-proton collisions at sqrt(s) = 900 GeV and 7 TeV. The collision eventswere collected during 2009 and 2010 with the ATLAS detector at the Large HadronCollider using a single-arm minimum bias trigger. Correlations are measured forcharged particles produced in the kinematic range of transverse momentum pT >100 MeV and pseudorapidity |eta| < 2.5. A complex structure in pseudorapidityand azimuth is observed at both collision energies. Results are compared toPythia 8 and Herwig++ as well as to the AMBT2B, DW and Perugia 2011 tunes ofPythia 6. The data are not satisfactorily described by any of these models.

Measurement of inclusive two-particle angular correlations in pp collisions with the ATLAS detector at the LHC