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

作者：Acharya S^*; Acosta F T; Adamova D; Adolfsson J; Aggarwal M M; Rinella G Aglieri; Agnello M; Agrawal N; Ahammed Z; Ahn S U; Aiola S; Akindinov A; Al Turany M; Alam S N; Albuquerque D S D; Aleksandrov D; Alessandro B; Alfaro Molina R; Ali Y; Alici A; Alkin A; Alme J; Alt T; Altenkamper L; Altsybeev I; Anaam M N; Andrei C; Andreou D; Andrews H A; Andronic A; Angeletti M; Anguelov V; Anson C; Anticic T; Antinori F; Antonioli P; Anwar R; Apadula N; Aphecetche L; Appelshaeuser H; Arcelli S

来源：The Journal of High Energy Physics, 2018, 171(9): 006.

DOI：10.1007/JHEP09(2018)006

• Heavy Ion Experiments

The elliptic (v(2)), triangular (v(3)), and quadrangular (v(4)) flow coefficients of pi(+/-), K-+/-, p + (p) over bar, Lambda + (Lambda) over bar, K-S(0)), and the phi-meson are measured in Pb-Pb collisions at root(NN)-N-s = 5.02 TeV. Results obtained with the scalar product method are reported for the rapidity range vertical bar y vertical bar < 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 pi(+/-), K-+/-, and p + (p) over bar. 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 phi-meson v(2), which tests both particle mass dependence and type scaling, follows p + <(p)over bar> v(2) at low P-T and pi(+/-) 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 pi(+/-), K-+/- , and p + (p) over bar 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 vn coefficients measured in Pb-Pb collisions at root(NN)-N-s = 2.76 TeV is also provided.

• 出版日期2018-9-3
• 单位中国地震局; 中国原子能科学研究院; 华中师范大学; 中国科学院上海应用物理研究所