Long-range angular correlations at the LHC with ALICE

Abstract

The observation of long-range correlations on the near and away side -the double ridge- in high-multiplicity p-Pb collisions at sqrt(s_NN) = 5.02 TeV and its similarity to Pb-Pb collisions remains one of the open questions from the p-Pb run at the Large Hadron Collider (LHC). It has been attributed to mechanisms that involve initial-state effects, such as gluon saturation and colour connections forming along the longitudinal direction, and final-state effects, such as parton-induced interactions and collective effects developing in a high-density system possibly formed in these collisions. In order to understand the nature of this double- ridge structure the two-particle correlation analysis has been extended to identified particles. The observed mass dependence in p-Pb resembles the pattern observed in Pb-Pb collisions and is compatible with expectations from hydrodynamics. The subtraction of the long-range structures allows the study of the hadron production belonging to the fragmentation of jets originating from low momentum-transfer scatterings (minijets).

contribution to the Quark Matter 2014 conference proceedings

References in corpus (4)

• Observation of long-range near-side angular correlations in proton-lead collisions at the LHC
• Multi-particle azimuthal correlations in p-Pb and Pb-Pb collisions at the CERN Large Hadron Collider
• Elliptic flow of identified hadrons in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Multiplicity dependence of jet-like two-particle correlations in p-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV

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• A CGC/saturation approach for angular correlations in proton-proton scattering
• Bose-Einstein correlations in perturbative QCD: $v_n$ dependence on multiplicity
• Azimuthal angle correlations at large rapidities: revisiting density variation mechanism
• Cumulant Expansion in Gluon Saturation, and Five and Six-Gluon Azimuthal Correlations