PoS - Proceedings of Science
Volume 364 - European Physical Society Conference on High Energy Physics (EPS-HEP2019) - Heavy Ion Physics
Azimuthal anisotropy in Pb+Pb, Xe+Xe and p+Pb collisions and vn–pt correlations in Pb+Pb and p+Pb collisions with the ATLAS experiment
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Abstract
ATLAS measurements of differential and global Fourier
harmonics of charged particles $(v_n)$ in 5.02 TeV Pb+Pb and
5.44 TeV Xe+Xe collisions in a wide range of transverse
momenta (up to 60 GeV), pseudorapidity ($|\eta|<2.5$) and
collision centrality (0-80\%) are presented. The higher order
harmonics, sensitive to fluctuations in the initial state, are
measured up to $n$ = 5 using the two-particle correlation,
cumulant and scalar-product methods. The flow results allow to improve the
understanding of initial conditions of nuclear collisions,
hydrodynamical behaviour of quark-gluon plasma (QGP) and parton
energy loss. The dynamic properties of the QGP can also be
studied using a modified Pearson's correlation coefficient,
$\rho(v_n,p_\mathrm{T})$, that quantifies correlation between the mean
transverse momentum and the magnitude of the flow vector. The
$\rho$ coefficient is presented for 5.02 TeV Pb+Pb and $p$+Pb
collisions. Azimuthal anisotropy in Pb+Pb collisions is also
compared with new measurements in $pp$ and $p$+Pb collisions.
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