The European Physical Journal C > 2018 > 78 > 12 > 1-35
Measurement of the azimuthal anisotropy of charged particles produced in $$\sqrt{s_{_\text {NN}}}$$ sNN = 5.02 TeV Pb+Pb collisions with the ATLAS detector
Źródło
Abstrakt
Measurements of the azimuthal anisotropy in lead–lead collisions at $$\sqrt{s_{_\text {NN}}}$$ sNN = 5.02 TeV are presented using a data sample corresponding to 0.49 $${\mathrm {nb}}^{-1}$$ 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, $$v_{2}$$ v2 –$$v_{7}$$ 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 $$v_{n}$$ vn over wide ranges of the transverse momentum, 0.5 $$<p_{\mathrm{T}}<$$ <pT< 60 GeV, the pseudorapidity, $$|\eta |<$$ |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 $$\sqrt{s_{_\text {NN}}}$$ sNN = 2.76 $$\mathrm{TeV}$$ TeV and 5.02 $$\mathrm{TeV}$$ TeV . In particular, the shape of the $$p_{\mathrm{T}}$$ pT dependence of elliptic or triangular flow harmonics is observed to be very similar at different centralities after scaling the $$v_{n}$$ vn and $$p_{\mathrm{T}}$$ pT values by constant factors over the centrality interval 0–60% and the $$p_{\mathrm{T}}$$ pT range 0.5 $$< p_{\mathrm{T}}<$$ <pT< 5 GeV.
Identyfikatory
ISSN czasopisma : | 1434-6044 |
e-ISSN czasopisma : | 1434-6052 |
DOI | 10.1140/epjc/s10052-018-6468-7 |