Measurement of the azimuthal anisotropy for charged particle production in sqrt(s_NN) = 2.76 TeV lead-lead collisions with the ATLAS detector

Aad, Georges and others (2018) Measurement of the azimuthal anisotropy for charged particle production in sqrt(s_NN) = 2.76 TeV lead-lead collisions with the ATLAS detector EUROPEAN PHYSICAL JOURNAL C, 78 (12). 997-. ISSN 1434-6044, 1434-6052

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Abstract

Measurements of the azimuthal anisotropy in lead–lead collisions at sNN = 5.02 TeV are presented using a data sample corresponding to 0.49 nb <sup>- 1</sup> 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, v<inf>2</inf>–v<inf>7</inf>, 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 v<inf>n</inf> over wide ranges of the transverse momentum, 0.5 < p<inf>T</inf>< 60 GeV, the pseudorapidity, | η| < 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 sNN = 2.76 TeV and 5.02 TeV. In particular, the shape of the p<inf>T</inf>dependence of elliptic or triangular flow harmonics is observed to be very similar at different centralities after scaling the v<inf>n</inf> and p<inf>T</inf>values by constant factors over the centrality interval 0–60% and the p<inf>T</inf>range 0.5 < p<inf>T</inf>< 5 GeV.

Item Type:	Article
Additional Information:	## TULIP Type: Articles/Papers (Journal) ##
Uncontrolled Keywords:	ATLAS Collaboration
Depositing User:	Symplectic Admin
Date Deposited:	07 Jan 2019 09:57
Last Modified:	22 Jan 2026 07:32
DOI:	10.1140/epjc/s10052-018-6468-7
Open Access URL:	http://doi.org/10.1140/epjc/s10052-018-6468-7
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3030900
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