Anisotropic flow of identified particles in Pb-Pb collisions at √sNN=5.02 TeV

ALICE Collaboration

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The elliptic (v2), triangular (v3), and quadrangular (v4) flow coefficients of π±, K±, p+p¯,Λ+Λ¯,KS0$$ \mathrm{p}+\overline{\mathrm{p}},\kern0.5em \Lambda +\overline{\Lambda},\kern0.5em {\mathrm{K}}_{\mathrm{S}}^0 $$, and the ϕ-meson are measured in Pb-Pb collisions at sNN=5.02$$ {\sqrt{s}}_{\mathrm{NN}}=5.02 $$TeV. Results obtained with the scalar product method are reported for the rapidity range |y| <0.5 as a function of transverse momentum, pT, at different collision centrality intervals between 0–70%, including ultra-central (0–1%) collisions for π±, K±, and p+p¯$$ \mathrm{p}+\overline{\mathrm{p}} $$. For pT <3 GeV/c, the flow coefficients exhibit a particle mass dependence. At intermediate transverse momenta (3 <pT <8–10 GeV/c), particles show an approximate grouping according to their type (i.e., mesons and baryons). The ϕ-meson v2, which tests both particle mass dependence and type scaling, follows p+p¯$$ \mathrm{p}+\overline{\mathrm{p}} $$v2 at low pT and π± v2 at intermediate pT. The evolution of the shape of vn(pT) as a function of centrality and harmonic number n is studied for the various particle species. Flow coefficients of π±, K±, and p+p¯$$ \mathrm{p}+\overline{\mathrm{p}} $$for pT <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 pT <2.5 GeV/c, while MUSIC calculations reproduce the measurements for pT <1 GeV/c. A comparison to vn coefficients measured in Pb-Pb collisions at sNN=2.76$$ \sqrt{s_{\mathrm{NN}}}=2.76 $$TeV is also provided.
Original languageEnglish
JournalJournal of High Energy Physics
Issue number9
Publication statusPublished - 3 Sept 2018


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