Abstract
Two-particle correlations in collisions at a nucleon-nucleon center-of-mass energy of are studied as a function of the pseudorapidity separation () of the particle pair at small relative azimuthal angle (). The correlations are decomposed into a jet component that dominates the short-range correlations (), and a component that persists at large and may originate from collective behavior of the produced system. The events are classified in terms of the multiplicity of the produced particles. Finite azimuthal anisotropies are observed in high-multiplicity events. The second and third Fourier components of the particle-pair azimuthal correlations, and , are extracted after subtraction of the jet component. The single-particle anisotropy parameters and are normalized by their laboratory frame midrapidity value and are studied as a function of . The normalized distribution is found to be asymmetric about , with smaller values observed at forward pseudorapidity, corresponding to the direction of the proton beam, while no significant pseudorapidity dependence is observed for the normalized distribution within the statistical uncertainties.
- Received 18 April 2016
- Revised 28 April 2017
DOI:https://doi.org/10.1103/PhysRevC.96.014915
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©2017 CERN, for the CMS Collaboration