Anisotropic flow of identified particles in Pb-Pb collisions at $\sqrt{{\text{s}}_{\mathrm{NN}}}=5.02$ TeV

Abstract

The elliptic ($v_2$), triangular ($v_3$), and quadrangular ($v_4$) flow coefficients of ${\pi }^{\pm }$, ${\mathrm{K}}^{\pm }$, $\mathrm{p}+\overline{\mathrm{p}}$, $\Lambda +\overline{\Lambda }$, ${\mathrm{K}}_{\mathrm{S}}^0$, and the $\varphi$-meson are measured in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV. Results obtained with the scalar product method are reported for the rapidity range $|y|<$ 0.5 as a function of transverse momentum, $p_{\text{T}}$, at different collision centrality intervals between 0-70%, including ultra-central (0-1%) collisions for ${\pi }^{\pm }$, ${\mathrm{K}}^{\pm }$, and $\mathrm{p}+\overline{\mathrm{p}}$. For $p_{\text{T}}<3$ GeV$/c$, the flow coefficients exhibit a particle mass dependence. At intermediate transverse momenta ($3<p_{\text{T}}<$~8-10 GeV$/c$), particles show an approximate grouping according to their type (i.e., mesons and baryons). The $\varphi$-meson $v_2$, which tests both particle mass dependence and type scaling, follows $\mathrm{p}+\overline{\mathrm{p}}$ $v_2$ at low $p_{\text{T}}$ and ${\pi }^{\pm }$ $v_2$ at intermediate $p_{\text{T}}$. The evolution of the shape of $v_{\mathrm{n}}(p_{\mathrm{T}})$ as a function of centrality and harmonic number $n$ is studied for the various particle species. Flow coefficients of ${\pi }^{\pm }$, ${\mathrm{K}}^{\pm }$, and $\mathrm{p}+\overline{\mathrm{p}}$ for $p_{\text{T}}<3$ GeV$/c$ are compared to iEBE-VISHNU and MUSIC hydrodynamical calculations coupled to a hadronic cascade model (UrQMD). The iEBE-VISHNU calculations describe the results fairly well for $p_{\text{T}}<2.5$ GeV$/c$, while MUSIC calculations reproduce the measurements for $p_{\text{T}}<1$ GeV$/c$. A comparison to $v_{\mathrm{n}}$ coefficients measured in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV is also provided.

40 pages, 24 captioned figures, 3 tables, authors from page 35, published, figures at http://aliceinfo.cern.ch/ArtSubmission/node/4287

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