Abstract
Abstract We present a measurement of two-particle angular correlations in proton- proton collisions at $ \sqrt {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.
Highlights
Additional interactions, and other collective effects, in the hot and dense medium present in heavy ion collisions
This study focuses on the two-particle angular correlations in pseudorapidity, η, and azimuthal angle, φ, using proton-proton collision data collected by the ATLAS experiment1 at the Large Hadron Collider (LHC)
Most obvious are the near-side correlations, which are seen as a sharp peak around (0,0) that can be attributed to particles originating from the same high-pT process
Summary
Additional interactions, and other collective effects, in the hot and dense medium present in heavy ion collisions. This study focuses on the two-particle angular correlations in pseudorapidity, η, and azimuthal angle, φ, using proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider (LHC). Proton-proton collisions at centre-of-mass collision energies of s = 900 GeV and 7 TeV. For the 7 TeV centre-of-mass energy, an additional region of phase space is considered for which the charged-particle multiplicity per event is at least twenty.
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