Measurement of the azimuthal anisotropy of charged particles in 5.02 TeV Pb+Pb and 5.44 TeV Xe+Xe collisions with ATLAS

Bold, Tomasz

doi:10.1016/j.nuclphysa.2018.09.045

Measurement of the azimuthal anisotropy of charged particles in 5.02 TeV Pb+Pb and 5.44 TeV Xe+Xe collisions with ATLAS

ATLAS

Collaboration

•

Tomasz Bold
(
- AGH-UST, Cracow
)

for the collaboration.

Feb, 2019

4 pages

Part of Proceedings, 27th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2018) : Venice, Italy, May 14-19, 2018, 391-394

Published in:

Nucl.Phys.A 982 (2019) 391-394

Contribution to:

- Quark Matter 2018
, 391-394

Published: Feb, 2019

DOI:

10.1016/j.nuclphysa.2018.09.045

Report number:

ATL-PHYS-PROC-2018-060

Experiments:

CERN-LHC-ATLAS

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Abstract: (Elsevier)

The data collected by the ATLAS experiment during the 2015 Pb+Pb and 2017 Xe+Xe LHC runs offer new opportunities to study charged particle azimuthal anisotropy. The high-statistics Pb+Pb sample allows for a detailed study of the azimuthal anisotropy of produced particles. This should improve the understanding of initial conditions of nuclear collisions, hydrodynamical behavior of quark-gluon plasma and parton energy loss. New ATLAS measurements of differential and global Fourier harmonics of charged particles ( ν n ) in 5.02 TeV Pb+Pb and 5.44 TeV Xe+Xe collisions in a wide range of transverse momenta, pseudorapidity (| η | < 2.5) and collision centrality are presented. The higher order harmonics, sensitive to fluctuations in the initial state, are measured up to n = 7 using the two-particle correlation, cumulant and scalar product methods. The dynamic properties of QGP are studied using a recently-proposed modified Pearson's correlation coefficient, ρ(νn2,pT) , between the event-wise mean transverse momentum and the magnitude of the flow vector in 5.02 TeV Pb+Pb and p+Pb collisions. Several important observations are made. The elliptic and triangular flow harmonics show an interesting universal p T -scaling. A linear correlation between the ν 2 and ν 3 coefficients at low and high p T ranges is observed and quantified. The correlation coefficient for ν 2 is found to be negative in peripheral and positive in central Pb+Pb collisions. The value for ν 3 is found to be much smaller than for ν 2 and have similar centrality behavior as the ν 2 .