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

Journal Article · · Physical Review Letters
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Measurements of anisotropic flow coefficients (vn) and their cross-correlations using two- and multiparticle cumulant methods are reported in collisions of pp at $$ \sqrt{s_{NN}}$$=13 TeV, p-Pb at a center-of-mass energy per nucleon pair $$ \sqrt{s_{NN}}$$=5.02 TeV, Xe-Xe at $$ \sqrt{s_{NN}}$$=5.44 TeV, and Pb-Pb at $$ \sqrt{s_{NN}}$$=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| < 0.8 for the transverse momentum range 0.2 < pT < 3.0 GeV/c. An ordering of the coefficients v2 > 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 v$$_{n}^{2}$$ and v$$_{m}^{2}$$, 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 v$$_{n}$$ 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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
A Large Ion Collider Experiment Collaboration
Grant/Contract Number:
AC02-05CH11231; AC05-00OR22725
OSTI ID:
1569085
Alternate ID(s):
OSTI ID: 1581607; OSTI ID: 1840170
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Vol. 123 Journal Issue: 14; ISSN 0031-9007
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 51 works
Citation information provided by
Web of Science

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Cited By (2)

Investigations of Anisotropic Flow Using Multiparticle Azimuthal Correlations in $pp$, $p-Pb$, Xe-Xe, and Pb-Pb Collisions at the LHC text January 2019
Glauber Monte Carlo predictions for ultrarelativistic collisions with O 16 journal December 2019