Pseudorapidity dependence of long-range two-particle correlations in pPb collisions at sNN=5.02 TeV

2016/04/30 by V. Khachatryan, CMS Collaboration, A. M. Sirunyan +98
Mathematics · Physics and Astronomy · #Charged particle #Combinatorics #Crystallography #Distribution function #Energy (signal processing) #Geometry #High-Energy Particle Collisions Research #Ion #Mathematics #Multiplicity (mathematics) #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Physics #Pseudorapidity #Quantum Chromodynamics and Particle Interactions #hep-ex #nucl-ex

paper · pdf · doi:10.1103/physrevc.96.014915

published as Phys. Rev. C 96 (2017) 014915 · Replaced with the published version. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-14-008/index.html (CMS Public Pages)

openalex created_date 2016/06/24 · openalex publication_date 2017/07/31 · arxiv created 2017/09/28 · arxiv updated 2017/10/02 · openalex updated_date 2026/08/06

Abstract

Two-particle correlations in pPb collisions at a nucleon-nucleon center-of-mass energy of 5.02\phantom\rule0.16em0exTeV are studied as a function of the pseudorapidity separation (\mathrm\ensuremathΔ\ensuremathη) of the particle pair at small relative azimuthal angle (|\mathrm\ensuremathΔ\ensuremathφ|<\ensuremathπ/3). The correlations are decomposed into a jet component that dominates the short-range correlations (|\mathrm\ensuremathΔ\ensuremathη|<1), and a component that persists at large \mathrm\ensuremathΔ\ensuremathη 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, V₂ and V₃, are extracted after subtraction of the jet component. The single-particle anisotropy parameters v₂ and v₃ are normalized by their laboratory frame midrapidity value and are studied as a function of \ensuremathη_c.m.. The normalized v₂ distribution is found to be asymmetric about \ensuremathη_c.m.=0, 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 v₃ distribution within the statistical uncertainties.

Citations

• Producing Hard Processes Regarding the Complete Event: The EPOS Event Generator
• Longitudinal decorrelation of anisotropic flows in heavy-ion collisions at the CERN Large Hadron Collider
• Centrality dependence of dihadron correlations and azimuthal anisotropy harmonics in PbPb collisions at √s_NN= 2.76 TeV
• Long range rapidity correlations and jet production in high energy nuclear collisions
• Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC
• Experimental and theoretical challenges in the search for the quark–gluon plasma: The STAR Collaboration's critical assessment of the evidence from RHIC collisions