期刊
PHYSICAL REVIEW C
卷 86, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.86.054908
关键词
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资金
- RHIC Operations Group
- RCF at BNL
- NERSC Center at LBNL
- Open Science Grid consortium
- Offices of NP and HEP within the US DOE Office of Science
- US NSF
- Sloan Foundation
- CNRS/IN2P3
- FAPESP CNPq of Brazil
- Ministry of Education and Science of the Russian Federation
- NNSFC
- CAS
- MoST
- MoE of China
- GA
- MSMT of the Czech Republic
- FOM
- NWO of the Netherlands
- DAE
- DST
- CSIR of India
- Polish Ministry of Science and Higher Education
- Korea Research Foundation
- Ministry of Science, Education, and Sports of the Republic of Croatia
- RosAtom of Russia
- Direct For Mathematical & Physical Scien
- Division Of Physics [970048] Funding Source: National Science Foundation
A systematic study is presented for centrality, transverse momentum (p(T)), and pseudorapidity (eta) dependence of the inclusive charged hadron elliptic flow (v(2)) at midrapidity (vertical bar eta vertical bar < 1.0) in Au + Au collisions at root s(NN) = 7.7, 11.5, 19.6, 27, and 39 GeV. The results obtained with different methods, including correlations with the event plane reconstructed in a region separated by a large pseudorapidity gap and four-particle cumulants (v(2){4}), are presented to investigate nonflow correlations and v(2) fluctuations. We observe that the difference between v(2){2} and v(2){4} is smaller at the lower collision energies. Values of v(2), scaled by the initial coordinate space eccentricity, v(2)/epsilon, as a function of p(T) are larger in more central collisions, suggesting stronger collective flow develops in more central collisions, similar to the results at higher collision energies. These results are compared to measurements at higher energies at the Relativistic Heavy Ion Collider (root s(NN) = 62.4 and 200 GeV) and at the Large Hadron Collider (Pb + Pb collisions at root s(NN) = 2.76 TeV). The v(2)(pT) values for fixed pT rise with increasing collision energy within the pT range studied (<2 GeV/c). A comparison to viscous hydrodynamic simulations is made to potentially help understand the energy dependence of v(2)(pT). We also compare the v(2) results to UrQMD and AMPT transport model calculations, and physics implications on the dominance of partonic versus hadronic phases in the system created at beam energy scan energies are discussed.
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