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

Acharya, S.; Torales - Acosta, Fernando; Adamova, Dagmar; Adolfsson, Jonatan; Aggarwal, Madan Mohan; Aglieri Rinella, Gianluca; Agnello, Michelangelo; Agrawal, Neelima; Ahammed, Zubayer; Ahn, Sang Un

doi:10.1007/JHEP09(2018)006

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

ALICE

Collaboration

May 11, 2018

40 pages

Published in:

JHEP 09 (2018) 006

Published: Sep 3, 2018

e-Print:

1805.04390 [nucl-ex]

DOI:

10.1007/JHEP09(2018)006

Report number:

CERN-EP-2018-103

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (Springer)

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

, and the ϕ-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

_{T}

, at different collision centrality intervals between 0–70%, including ultra-central (0–1%) collisions for π

^{±}

, K

^{±}

, and

\mathrm{p}+\overline{\mathrm{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}}

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}}

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

TeV is also provided.

Note:

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

Heavy Ion Experiments
heavy ion: scattering
cascade: hadronic
model: cascade
elliptic flow
transverse momentum
mass dependence
triangular flow
hydrodynamics
rapidity

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

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