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Measurement of the azimuthal anisotropy of charged particles produced in vsNN = 5.02 TeV Pb+Pb collisions with the ATLAS detector

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posted on 2023-06-09, 18:44 authored by N L Abraham, Benedict AllbrookeBenedict Allbrooke, Lily AsquithLily Asquith, Alessandro Cerri, Antonella De SantoAntonella De Santo, Samuel Jones, Fabrizio SalvatoreFabrizio Salvatore, Kate ShawKate Shaw, Thomas StevensonThomas Stevenson, K Suruliz, Mark SuttonMark Sutton, Fabio Tresoldi, Fabrizio Trovato, Iacopo Vivarelli, E Winkels, The ATLAS Collaboration, others
Measurements of the azimuthal anisotropy in lead–lead collisions at vsNN = 5.02 TeV are presented using a data sample corresponding to 0.49 nb-1 integrated luminosity collected by the ATLAS experiment at the LHC in 2015. The recorded minimum-bias sample is enhanced by triggers for “ultra-central” collisions, providing an opportunity to perform detailed study of flow harmonics in the regime where the initial state is dominated by fluctuations. The anisotropy of the charged-particle azimuthal angle distributions is characterized by the Fourier coefficients, v2–v7, which are measured using the two-particle correlation, scalar-product and event-plane methods. The goal of the paper is to provide measurements of the differential as well as integrated flow harmonics vn over wide ranges of the transverse momentum, 0.5 < pT < 60 GeV, the pseudorapidity, |?| < 2.5, and the collision centrality 0–80%. Results from different methods are compared and discussed in the context of previous and recent measurements in Pb+Pb collisions at vsNN =2.76 TeV and 5.02TeV. In particular, the shape of the pT dependence of elliptic or triangular flow harmonics is observed to be very similar at different centralities after scaling the vn and pT values by constant factors over the centrality interval 0–60% and the pT range 0.5 < pT < 5 GeV.

History

Publication status

  • Published

File Version

  • Published version

Journal

European Physical Journal C: Particles and Fields

ISSN

1434-6044

Publisher

EDP Sciences

Issue

997

Volume

78

Page range

1-35

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2019-09-13

First Open Access (FOA) Date

2019-09-13

First Compliant Deposit (FCD) Date

2019-08-22

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