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
Aguilar Saavedra, Juan Antonio
Atlas Collaboration
Heavy-ion
Correlations
Collectivity
Flow
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 (vn) in 5.02 TeV Pb+Pb and 5.44 TeV Xe+Xe collisions
in a wide range of transverse momenta, pseudorapidity (|n| < 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, (v2n
; 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 pT-scaling. A linear correlation between the v2 and v3 coefficients at low
and high pT ranges is observed and quantified. The correlation coefficient for v2 is found to be negative in peripheral and
positive in central Pb+Pb collisions. The value for v3 is found to be much smaller than for v2 and have similar centrality
behavior as the v2.
2020-01-23T07:55:39Z
2020-01-23T07:55:39Z
2019
info:eu-repo/semantics/article
Bold, T. (2019). Measurement of the azimuthal anisotropy of charged particles in 5.02 TeV Pb+ Pb and 5.44 TeV Xe+ Xe collisions with ATLAS. Nuclear Physics A, 982, 391-394.
http://hdl.handle.net/10481/59034
10.1016/j.nuclphysa.2018.09.045
eng
http://creativecommons.org/licenses/by/3.0/es/
info:eu-repo/semantics/openAccess
Atribución 3.0 España
Elsevier BV