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). 6-. ISSN 1029-8479, 1029-8479

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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: 07 Dec 2024 01:49
DOI: 10.1007/JHEP09(2018)006
Open Access URL: https://doi.org/10.1007/JHEP09(2018)006
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3039026