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

S., Acharya ; Adolfsson, J. LU ; Christiansen, P. LU ; Ljunggren, H. LU ; Nassirpour, A. LU orcid ; Oskarsson, A. LU ; Richert, T. LU ; Rueda, Oscar M LU ; Silvermyr, D. LU orcid and Stenlund, E. LU , et al. (2019) In Physical Review Letters 123(14).
Abstract
Measurements of anisotropic flow coefficients (vn) and their cross-correlations using two- and multiparticle cumulant methods are reported in collisions of pp at s=13 TeV, p-Pb at a center-of-mass energy per nucleon pair sNN=5.02 TeV, Xe-Xe at sNN=5.44 TeV, and Pb-Pb at sNN=5.02 TeV recorded with the ALICE detector. The multiplicity dependence of vn is studied in a very wide range from 20 to 3000 particles produced in the midrapidity region |η|v3>v4 is found in pp and p-Pb collisions, similar to that seen in large collision systems, while a weak v2 multiplicity dependence is observed relative to nucleus-nucleus collisions in the same multiplicity range. Using a novel subevent method, v2 measured with four-particle cumulants is found to... (More)
Measurements of anisotropic flow coefficients (vn) and their cross-correlations using two- and multiparticle cumulant methods are reported in collisions of pp at s=13 TeV, p-Pb at a center-of-mass energy per nucleon pair sNN=5.02 TeV, Xe-Xe at sNN=5.44 TeV, and Pb-Pb at sNN=5.02 TeV recorded with the ALICE detector. The multiplicity dependence of vn is studied in a very wide range from 20 to 3000 particles produced in the midrapidity region |η|v3>v4 is found in pp and p-Pb collisions, similar to that seen in large collision systems, while a weak v2 multiplicity dependence is observed relative to nucleus-nucleus collisions in the same multiplicity range. Using a novel subevent method, v2 measured with four-particle cumulants is found to be compatible with that from six-particle cumulants in pp and p-Pb collisions. The magnitude of the correlation between vn2 and vm2, evaluated with the symmetric cumulants SC(m,n) is observed to be positive at all multiplicities for v2 and v4, while for v2 and v3 it is negative and changes sign for multiplicities below 100, which may indicate a different vn fluctuation pattern in this multiplicity range. The observed long-range multiparticle azimuthal correlations in high multiplicity pp and p-Pb collisions can neither be described by pythia 8 nor by impact-parameter-Glasma, music, and ultrarelativistic quantum molecular dynamics model calculations, and hence, provide new insights into the understanding of collective effects in small collision systems. © 2019 CERN, for the ALICE Collaboration. (Less)
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organization
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type
Contribution to journal
publication status
published
subject
keywords
Anisotropy, Molecular dynamics, Anisotropic flows, Azimuthal correlations, Collective effects, Cross correlations, High multiplicity, Nucleus-nucleus collision, Quantum molecular dynamics modeling, Transverse momenta, Binary alloys
in
Physical Review Letters
volume
123
issue
14
article number
142301
publisher
American Physical Society
external identifiers
  • scopus:85074697775
ISSN
0031-9007
DOI
10.1103/PhysRevLett.123.142301
language
English
LU publication?
yes
id
7728dfaf-a7a1-4405-959a-2451abdf36ae
date added to LUP
2022-04-05 18:11:26
date last changed
2023-04-02 22:56:08
@article{7728dfaf-a7a1-4405-959a-2451abdf36ae,
  abstract     = {{Measurements of anisotropic flow coefficients (vn) and their cross-correlations using two- and multiparticle cumulant methods are reported in collisions of pp at s=13 TeV, p-Pb at a center-of-mass energy per nucleon pair sNN=5.02 TeV, Xe-Xe at sNN=5.44 TeV, and Pb-Pb at sNN=5.02 TeV recorded with the ALICE detector. The multiplicity dependence of vn is studied in a very wide range from 20 to 3000 particles produced in the midrapidity region |η|v3>v4 is found in pp and p-Pb collisions, similar to that seen in large collision systems, while a weak v2 multiplicity dependence is observed relative to nucleus-nucleus collisions in the same multiplicity range. Using a novel subevent method, v2 measured with four-particle cumulants is found to be compatible with that from six-particle cumulants in pp and p-Pb collisions. The magnitude of the correlation between vn2 and vm2, evaluated with the symmetric cumulants SC(m,n) is observed to be positive at all multiplicities for v2 and v4, while for v2 and v3 it is negative and changes sign for multiplicities below 100, which may indicate a different vn fluctuation pattern in this multiplicity range. The observed long-range multiparticle azimuthal correlations in high multiplicity pp and p-Pb collisions can neither be described by pythia 8 nor by impact-parameter-Glasma, music, and ultrarelativistic quantum molecular dynamics model calculations, and hence, provide new insights into the understanding of collective effects in small collision systems. © 2019 CERN, for the ALICE Collaboration.}},
  author       = {{S., Acharya and Adolfsson, J. and Christiansen, P. and Ljunggren, H. and Nassirpour, A. and Oskarsson, A. and Richert, T. and Rueda, Oscar M and Silvermyr, D. and Stenlund, E. and N., Zurlo}},
  issn         = {{0031-9007}},
  keywords     = {{Anisotropy; Molecular dynamics; Anisotropic flows; Azimuthal correlations; Collective effects; Cross correlations; High multiplicity; Nucleus-nucleus collision; Quantum molecular dynamics modeling; Transverse momenta; Binary alloys}},
  language     = {{eng}},
  number       = {{14}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Letters}},
  title        = {{Investigations of Anisotropic Flow Using Multiparticle Azimuthal Correlations in pp, p-Pb, Xe-Xe, and Pb-Pb Collisions at the LHC}},
  url          = {{http://dx.doi.org/10.1103/PhysRevLett.123.142301}},
  doi          = {{10.1103/PhysRevLett.123.142301}},
  volume       = {{123}},
  year         = {{2019}},
}