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

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Article number157
<mark>Journal publication date</mark>05/2012
<mark>Journal</mark>Journal of High Energy Physics
Issue number5
Volume2012
Number of pages45
Publication StatusPublished
<mark>Original language</mark>English

Abstract

We present a measurement of two-particle angular correlations in proton- proton collisions at s√=900 GeV and 7 TeV. 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 p T  > 100 MeV and pseudorapidity |η| < 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.

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This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.