期刊
PHYSICAL REVIEW C
卷 99, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.99.064905
关键词
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资金
- RHIC Operations Group at BNL
- RCF at BNL
- NERSC Center at LBNL
- Open Science Grid consortium
- Office of Nuclear Physics within the U.S. DOE Office of Science
- U.S. National Science Foundation
- Ministry of Education and Science of the Russian Federation
- National Natural Science Foundation of China
- Chinese Academy of Science
- Ministry of Science and Technology of China (973 Programme) [2015CB856900]
- Chinese Ministry of Education
- National Research Foundation of Korea
- GA of the Czech Republic
- MSMT of the Czech Republic
- Hungarian National Research, Development and Innovation Office [FK-123824]
- New National Excellency Programme of the Hungarian Ministry of Human Capacities [UNKP-18-4]
- Department of Atomic Energy of the Government of India
- Department of Science and Technology of the Government of India
- National Science Centre of Poland
- National Research Foundation
- Ministry of Science, Education and Sports of the Republic of Croatia
- RosAtom of Russia
- German Bundesministerium fur Bildung, Wissenschaft, Forschung und Technologie (BMBF)
- Helmholtz Association
We report the energy dependence of mid-rapidity (anti-)deuteron production in Au+Au collisions at root s(NN) = 7.7, 11.5, 14.5, 19.6, 27, 39, 62.4, and 200 GeV, measured by the STAR experiment at the BNL Relativistic Heavy Ion Collider. The yield of deuterons is found to be well described by the thermal model. The collision energy, centrality, and transverse momentum dependence of the coalescence parameter B-2 are discussed. We find that the values of B-2 for antideuterons are systematically lower than those for deuterons, indicating that the correlation volume of antibaryons is larger than that of baryons at root s(NN) from 19.6 to 39 GeV. In addition, values of B-2 are found to vary with collision energy and show a broad minimum around root s(NN) = 20-40 GeV, which might imply a change of the equation of state of the medium in these collisions.
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