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Pseudorapidity dependence of long-range two-particle correlations in $pPb$ collisions at $\sqrt{s_{NN}}= 5.02$ TeV


CMS Collaboration; Canelli, Florencia; Kilminster, Benjamin; Aarestad, Thea; Caminada, Lea; De Cosa, Annapaoloa; Del Burgo, Riccardo; Donato, Silvio; Galloni, Camilla; Hinzmann, Andreas; Hreus, Tomas; Ngadiuba, Jennifer; Pinna, Deborah; Rauco, Giorgia; Robmann, Peter; Salerno, Daniel; Schweiger, Korbinian; Seitz, Claudia; Takahashi, Yuta; Zucchetta, Alberto; et al (2017). Pseudorapidity dependence of long-range two-particle correlations in $pPb$ collisions at $\sqrt{s_{NN}}= 5.02$ TeV. Physical review. C, Nuclear physics, C96(1):014915.

Abstract

Two-particle correlations in $pPb$ collisions at a nucleon-nucleon center-of-mass energy of $5.02$TeV are studied as a function of the pseudorapidity separation ($Δη$) of the particle pair at small relative azimuthal angle ($|Δϕ|<\pi/3$). The correlations are decomposed into a jet component that dominates the short-range correlations ($|Δη|<1$), and a component that persists at large $Δη$ 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, $V_2$ and $V_3$, are extracted after subtraction of the jet component. The single-particle anisotropy parameters $v_2$ and $v_3$ are normalized by their laboratory frame midrapidity value and are studied as a function of $η_{c.m.}$. The normalized $v_2$ distribution is found to be asymmetric about $η_{c.m.}$=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 $v_3$ distribution within the statistical uncertainties.

Abstract

Two-particle correlations in $pPb$ collisions at a nucleon-nucleon center-of-mass energy of $5.02$TeV are studied as a function of the pseudorapidity separation ($Δη$) of the particle pair at small relative azimuthal angle ($|Δϕ|<\pi/3$). The correlations are decomposed into a jet component that dominates the short-range correlations ($|Δη|<1$), and a component that persists at large $Δη$ 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, $V_2$ and $V_3$, are extracted after subtraction of the jet component. The single-particle anisotropy parameters $v_2$ and $v_3$ are normalized by their laboratory frame midrapidity value and are studied as a function of $η_{c.m.}$. The normalized $v_2$ distribution is found to be asymmetric about $η_{c.m.}$=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 $v_3$ distribution within the statistical uncertainties.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2017
Deposited On:11 Dec 2017 15:27
Last Modified:19 Feb 2018 08:53
Publisher:American Physical Society
ISSN:0556-2813
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1103/PhysRevC.96.014915

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