A1 Journal article (refereed)
Investigations of Anisotropic Flow Using Multiparticle Azimuthal Correlations in pp, p−Pb, Xe-Xe, and Pb-Pb Collisions at the LHC (2019)

ALICE Collaboration (2019). Investigations of Anisotropic Flow Using Multiparticle Azimuthal Correlations in pp, p−Pb, Xe-Xe, and Pb-Pb Collisions at the LHC. Physical Review Letters, 123 (14), 142301. DOI: 10.1103/PhysRevLett.123.142301

JYU authors or editors

Publication details

All authors or editors: ALICE Collaboration

Journal or series: Physical Review Letters

ISSN: 0031-9007

eISSN: 1079-7114

Publication year: 2019

Volume: 123

Issue number: 14

Article number: 142301

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: http://doi.org/10.1103/PhysRevLett.123.142301

Open Access: Open access publication published in a hybrid channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/66017


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|<0.8 for the transverse momentum range 0.2v3>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 v2n and v2m, 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.

Keywords: particle physics

Contributing organizations

Ministry reporting: Yes

Reporting Year: 2019

JUFO rating: 3

Last updated on 2020-18-08 at 13:06