Importance of non-flow in mixed-harmonic multi-particle correlations in small collision systems

Huo, Peng; Gajdosova, Katarina; Jia, Jiangyong; Zhou, You

doi:10.1016/j.physletb.2017.12.035

Title: Importance of non-flow in mixed-harmonic multi-particle correlations in small collision systems

Abstract

Recently CMS Collaboration measured mixed-harmonic four-particle azimuthal correlations, known as symmetric cumulants SC(n, m), in pp and p+Pb collisions, and interpreted the non-zero SC(n, m) as evidence for long-range collectivity in these small collision systems. Using the PYTHIA and HIJING models which do not have genuine long-range collectivity, we show that the CMS results, obtained with standard cumulant method, could be dominated by non-flow effects associated with jet and dijets, especially in pp collisions. We show that the non-flow effects are largely suppressed using the recently proposed subevent cumulant methods by requiring azimuthal correlation between two or more pseudorapidity ranges. As a result, we argue that the reanalysis of SC(n, m) using the subevent method in experiments is necessary before they can used to provide further evidences for a long-range multi-particle collectivity and constraints on theoretical models in small collision systems.

Authors:

Huo, Peng ^[1]; Gajdosova, Katarina ^[2];

^[3];

^[2]

Stony Brook Univ., Stony Brook, NY (United States)
Univ. of Copenhagen, Copenhagen (Denmark)
Stony Brook Univ., Stony Brook, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

Publication Date:: Mon Dec 18 00:00:00 EST 2017

Research Org.:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP)

OSTI Identifier:: 1439313

Report Number(s):: BNL-205708-2018-JAAM
Journal ID: ISSN 0370-2693; TRN: US1900601

Grant/Contract Number:: SC0012704

Resource Type:: Accepted Manuscript

Journal Name:: Physics Letters. B

Additional Journal Information:: Journal Volume: 777; Journal Issue: C; Journal ID: ISSN 0370-2693

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats


                    Huo, Peng, Gajdosova, Katarina, Jia, Jiangyong, and Zhou, You. Importance of non-flow in mixed-harmonic multi-particle correlations in small collision systems.  United States: N. p., 2017. 
Web.  doi:10.1016/j.physletb.2017.12.035.

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                    Huo, Peng, Gajdosova, Katarina, Jia, Jiangyong, & Zhou, You. Importance of non-flow in mixed-harmonic multi-particle correlations in small collision systems.  United States.  https://doi.org/10.1016/j.physletb.2017.12.035

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                    Huo, Peng, Gajdosova, Katarina, Jia, Jiangyong, and Zhou, You. Mon .  
"Importance of non-flow in mixed-harmonic multi-particle correlations in small collision systems".  United States.  https://doi.org/10.1016/j.physletb.2017.12.035.  https://www.osti.gov/servlets/purl/1439313.

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@article{osti_1439313,

  title        = {Importance of non-flow in mixed-harmonic multi-particle correlations in small collision systems},

  author       = {Huo, Peng and Gajdosova, Katarina and Jia, Jiangyong and Zhou, You},

  abstractNote = {Recently CMS Collaboration measured mixed-harmonic four-particle azimuthal correlations, known as symmetric cumulants SC(n, m), in pp and p+Pb collisions, and interpreted the non-zero SC(n, m) as evidence for long-range collectivity in these small collision systems. Using the PYTHIA and HIJING models which do not have genuine long-range collectivity, we show that the CMS results, obtained with standard cumulant method, could be dominated by non-flow effects associated with jet and dijets, especially in pp collisions. We show that the non-flow effects are largely suppressed using the recently proposed subevent cumulant methods by requiring azimuthal correlation between two or more pseudorapidity ranges. As a result, we argue that the reanalysis of SC(n, m) using the subevent method in experiments is necessary before they can used to provide further evidences for a long-range multi-particle collectivity and constraints on theoretical models in small collision systems.},

  doi          = {10.1016/j.physletb.2017.12.035},

  journal      = {Physics Letters. B},

  number       = C,

  volume       = 777,

  place        = {United States},

  year         = {Mon Dec 18 00:00:00 EST 2017},

  month        = {Mon Dec 18 00:00:00 EST 2017}

}

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https://doi.org/10.1016/j.physletb.2017.12.035

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Cited by: 25 works

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Figure 1: The SC(n,m) calculated for charged particles with 0.3 < p_T < 3 GeV with the standard cumulant method in 13 TeV pp collisions (left panel) and 5.02 TeV p+Pb collisions (right panel) compared between data (solid symbols) and Monte Carlo models (open symbols).

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Title: Importance of non-flow in mixed-harmonic multi-particle correlations in small collision systems

Abstract

Citation Formats

Figures / Tables:

Observation of long-range, near-side angular correlations in pPb collisions at the LHC journal, January 2013

Collective dynamics in high-energy proton-nucleus collisions journal, July 2013

New method for measuring azimuthal distributions in nucleus-nucleus collisions journal, April 2001

Generic framework for anisotropic flow analyses with multiparticle azimuthal correlations journal, June 2014

Flow analysis from multiparticle azimuthal correlations journal, September 2001

Evidence for collectivity in pp collisions at the LHC journal, February 2017

Measurement of multi-particle azimuthal correlations in pp, p + Pb and low-multiplicity Pb + Pb collisions with the ATLAS detector journal, June 2017

A brief introduction to PYTHIA 8.1 journal, June 2008

HIJING 1.0: A Monte Carlo program for parton and particle production in high energy hadronic and nuclear collisions journal, December 1994

Investigations of anisotropic collectivity using multi-particle correlations in pp, p–Pb and Pb–Pb collisions journal, November 2017

Centrality fluctuations in heavy-ion collisions journal, October 2018

Multiparticle azimuthal cumulants in p + Pb collisions from a multiphase transport model journal, September 2018

CERN Large Hadron Collider system size scan predictions for PbPb, XeXe, ArAr, and OO with relativistic hydrodynamics journal, August 2019

Investigations of Anisotropic Flow Using Multiparticle Azimuthal Correlations in $pp$, $p-Pb$, Xe-Xe, and Pb-Pb Collisions at the LHC text, January 2019

Investigations of Anisotropic Flow Using Multiparticle Azimuthal Correlations in p p , p − Pb , Xe-Xe, and Pb-Pb Collisions at the LHC journal, October 2019

Centrality fluctuations in heavy-ion collisions text, January 2018

Investigations of Anisotropic Flow Using Multiparticle Azimuthal Correlations in p p , p − Pb , Xe-Xe, and Pb-Pb Collisions at the LHC journal, October 2019

Anisotropic flow in Xe-Xe collisions at $\mathbf{\sqrt{s_{\rm{NN}}} = 5.44}$ TeV text, January 2018

Correlated long-range mixed-harmonic fluctuations measured in $pp$, $p$+Pb and low-multiplicity Pb+Pb collisions with the ATLAS detector text, January 2018

Investigations of anisotropic flow using multi-particle azimuthal correlations in pp, p-Pb, Xe-Xe, and Pb-Pb collisions at the LHC text, January 2019

Correlations of azimuthal anisotropy Fourier harmonics with subevent cumulants in pPb collisions at $\sqrt{s_\mathrm{NN}} =$ 8.16 TeV text, January 2019

Hadronic Rescattering in pA and AA Collisions text, January 2021

Correlations of azimuthal anisotropy Fourier harmonics with subevent cumulants in pPb collisions at √$^{S}$NN = 8.16 TeV text, January 2021

Observation of long-range, near-side angular correlations in pPb collisions at the LHC
journal, January 2013

Collective dynamics in high-energy proton-nucleus collisions
journal, July 2013

New method for measuring azimuthal distributions in nucleus-nucleus collisions
journal, April 2001

Generic framework for anisotropic flow analyses with multiparticle azimuthal correlations
journal, June 2014

Flow analysis from multiparticle azimuthal correlations
journal, September 2001

Evidence for collectivity in pp collisions at the LHC
journal, February 2017

Measurement of multi-particle azimuthal correlations in pp, p + Pb and low-multiplicity Pb + Pb collisions with the ATLAS detector
journal, June 2017

A brief introduction to PYTHIA 8.1
journal, June 2008

HIJING 1.0: A Monte Carlo program for parton and particle production in high energy hadronic and nuclear collisions
journal, December 1994

Investigations of anisotropic collectivity using multi-particle correlations in pp, p–Pb and Pb–Pb collisions
journal, November 2017

Centrality fluctuations in heavy-ion collisions
journal, October 2018

Multiparticle azimuthal cumulants in $p + Pb$ collisions from a multiphase transport model
journal, September 2018

CERN Large Hadron Collider system size scan predictions for PbPb, XeXe, ArAr, and OO with relativistic hydrodynamics
journal, August 2019

Investigations of Anisotropic Flow Using Multiparticle Azimuthal Correlations in $pp$, $p-Pb$, Xe-Xe, and Pb-Pb Collisions at the LHC
text, January 2019

Investigations of Anisotropic Flow Using Multiparticle Azimuthal Correlations in $p p$ , $p − Pb$ , Xe-Xe, and Pb-Pb Collisions at the LHC
journal, October 2019

Centrality fluctuations in heavy-ion collisions
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Correlated long-range mixed-harmonic fluctuations measured in $pp$, $p$+Pb and low-multiplicity Pb+Pb collisions with the ATLAS detector
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