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

ATLAS COLLABORATION, G. AAD, MT DOVA ET AL

JOURNAL OF HIGH ENERGY PHYSICS

SPRINGER

Lugar: Berlin; Año: 2012 vol. 5 p. 157 - 177

1126-6708

We present a measurement of two-particle angular correlations in protonproton collisions at p s = 900 GeV and 7TeV. The collision events were collected during 2009 and 2010 with the ATLAS detector at the Large Hadron Collider using a single-arm minimum bias trigger. Correlations are measured for charged particles produced in the kinematic range of transverse momentum pT > 100MeV and pseudorapidity jj < 2.5. A complex structure in pseudorapidity and azimuth is observed at both collision energies. Results are compared to pythia 8 and herwig++ as well as to the AMBT2B, DW and Perugia 2011 tunes of pythia 6. The data are not satisfactorily described by any of these models.