In:
Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2018, No. 9 ( 2018-09)
Abstract:
The elliptic ( v 2 ), triangular ( v 3 ), and quadrangular ( v 4 ) flow coefficients of π ± , K ± , $$ \mathrm{p}+\overline{\mathrm{p}},\kern0.5em \Lambda +\overline{\Lambda},\kern0.5em {\mathrm{K}}_{\mathrm{S}}^0 $$ p + p ¯ , Λ + Λ ¯ , K S 0 , and the ϕ -meson are measured in Pb-Pb collisions at $$ {\sqrt{s}}_{\mathrm{NN}}=5.02 $$ s N N = 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 T , at different collision centrality intervals between 0–70%, including ultra-central (0–1%) collisions for π ± , K ± , and $$ \mathrm{p}+\overline{\mathrm{p}} $$ p + p ¯ . For p T 〈 3 GeV /c , the flow coefficients exhibit a particle mass dependence. At intermediate transverse momenta (3 〈 p T 〈 8–10 GeV/ c ), particles show an approximate grouping according to their type (i.e., mesons and baryons). The ϕ -meson v 2 , which tests both particle mass dependence and type scaling, follows $$ \mathrm{p}+\overline{\mathrm{p}} $$ p + p ¯ v 2 at low p T and π ± v 2 at intermediate p T . The evolution of the shape of v n ( p T ) as a function of centrality and harmonic number n is studied for the various particle species. Flow coefficients of π ± , K ± , and $$ \mathrm{p}+\overline{\mathrm{p}} $$ p + p ¯ for p 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 T 〈 2.5 GeV/ c , while MUSIC calculations reproduce the measurements for p T 〈 1 GeV/ c . A comparison to v n coefficients measured in Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}}=2.76 $$ s N N = 2.76 TeV is also provided.
Type of Medium:
Online Resource
ISSN:
1029-8479
DOI:
10.1007/JHEP09(2018)006
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2018
detail.hit.zdb_id:
2027350-2
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