Anisotropic flow of identified particles in Pb-Pb collisions at root s(NN)=5.02 TeV



Acharya, S, Acosta, FT, Adamova, D, Adolfsson, J, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU
et al (show 1002 more authors) (2018) Anisotropic flow of identified particles in Pb-Pb collisions at root s(NN)=5.02 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2018 (9).

Access the full-text of this item by clicking on the Open Access link.

Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title> <jats:p>The elliptic (<jats:italic>v</jats:italic> <jats:sub>2</jats:sub>), triangular (<jats:italic>v</jats:italic> <jats:sub>3</jats:sub>), and quadrangular (<jats:italic>v</jats:italic> <jats:sub>4</jats:sub>) flow coefficients of π<jats:sup>±</jats:sup>, K<jats:sup>±</jats:sup>, <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \mathrm{p}+\overline{\mathrm{p}},\kern0.5em \Lambda +\overline{\Lambda},\kern0.5em {\mathrm{K}}_{\mathrm{S}}^0 $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>p</mml:mi> <mml:mo>+</mml:mo> <mml:mover> <mml:mi>p</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mo>,</mml:mo> <mml:mspace /> <mml:mi>Λ</mml:mi> <mml:mo>+</mml:mo> <mml:mover> <mml:mi>Λ</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mo>,</mml:mo> <mml:mspace /> <mml:msubsup> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> </jats:alternatives> </jats:inline-formula>, and the <jats:italic>ϕ</jats:italic>-meson are measured in Pb-Pb collisions at <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ {\sqrt{s}}_{\mathrm{NN}}=5.02 $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mrow> <mml:mi>N</mml:mi> <mml:mi>N</mml:mi> </mml:mrow> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>5.02</mml:mn> </mml:math> </jats:alternatives> </jats:inline-formula> TeV. Results obtained with the scalar product method are reported for the rapidity range |<jats:italic>y</jats:italic>| <jats:italic>&lt;</jats:italic> 0.5 as a function of transverse momentum, <jats:italic>p</jats:italic> <jats:sub>T</jats:sub>, at different collision centrality intervals between 0–70%, including ultra-central (0–1%) collisions for <jats:italic>π</jats:italic> <jats:sup>±</jats:sup>, K<jats:sup>±</jats:sup>, and <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \mathrm{p}+\overline{\mathrm{p}} $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>p</mml:mi> <mml:mo>+</mml:mo> <mml:mover> <mml:mi>p</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> </jats:alternatives> </jats:inline-formula>. For <jats:italic>p</jats:italic> <jats:sub>T</jats:sub> <jats:italic>&lt;</jats:italic> 3 GeV<jats:italic>/c</jats:italic>, the flow coefficients exhibit a particle mass dependence. At intermediate transverse momenta (3 &lt; <jats:italic>p</jats:italic> <jats:sub>T</jats:sub> &lt; 8–10 GeV/<jats:italic>c</jats:italic>), particles show an approximate grouping according to their type (i.e., mesons and baryons). The <jats:italic>ϕ</jats:italic>-meson <jats:italic>v</jats:italic> <jats:sub>2</jats:sub>, which tests both particle mass dependence and type scaling, follows <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \mathrm{p}+\overline{\mathrm{p}} $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>p</mml:mi> <mml:mo>+</mml:mo> <mml:mover> <mml:mi>p</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> </jats:alternatives> </jats:inline-formula> <jats:italic>v</jats:italic> <jats:sub>2</jats:sub> at low <jats:italic>p</jats:italic> <jats:sub>T</jats:sub> and π<jats:sup>±</jats:sup> <jats:italic>v</jats:italic> <jats:sub>2</jats:sub> at intermediate <jats:italic>p</jats:italic> <jats:sub>T</jats:sub>. The evolution of the shape of <jats:italic>v</jats:italic> <jats:sub>n</jats:sub>(<jats:italic>p</jats:italic> <jats:sub>T</jats:sub>) as a function of centrality and harmonic number <jats:italic>n</jats:italic> is studied for the various particle species. Flow coefficients of <jats:italic>π</jats:italic> <jats:sup>±</jats:sup>, K<jats:sup>±</jats:sup>, and <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \mathrm{p}+\overline{\mathrm{p}} $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>p</mml:mi> <mml:mo>+</mml:mo> <mml:mover> <mml:mi>p</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> </jats:alternatives> </jats:inline-formula> for <jats:italic>p</jats:italic> <jats:sub>T</jats:sub> &lt; 3 GeV/<jats:italic>c</jats:italic> 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 <jats:italic>p</jats:italic> <jats:sub>T</jats:sub> &lt; 2.5 GeV/<jats:italic>c</jats:italic>, while MUSIC calculations reproduce the measurements for <jats:italic>p</jats:italic> <jats:sub>T</jats:sub> &lt; 1 GeV/<jats:italic>c</jats:italic>. A comparison to <jats:italic>v</jats:italic> <jats:sub>n</jats:sub> coefficients measured in Pb-Pb collisions at <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \sqrt{s_{\mathrm{NN}}}=2.76 $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mrow> <mml:mi>N</mml:mi> <mml:mi>N</mml:mi> </mml:mrow> </mml:msub> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>2.76</mml:mn> </mml:math> </jats:alternatives> </jats:inline-formula> TeV is also provided. </jats:p>

Item Type: Article
Uncontrolled Keywords: Heavy Ion Experiments
Depositing User: Symplectic Admin
Date Deposited: 30 Apr 2019 09:20
Last Modified: 19 Jan 2023 00:53
DOI: 10.1007/JHEP09(2018)006
Open Access URL: https://doi.org/10.1007/JHEP09(2018)006
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3039026