Measurements of dielectron production in Au plus Au collisions at root s(NN)=200 GeV from the STAR experiment
文献类型：期刊论文
| 作者 | Adamczyk, L.1; Adkins, J. K.20; Agakishiev, G.18; Aggarwal, M. M.30; Ahammed, Z.47; Alekseev, I.16; Alford, J.19; Aparin, A.18; Arkhipkin, D.3; Aschenauer, E. C.3 |
| 刊名 | PHYSICAL REVIEW C
 |
| 出版日期 | 2015-08-24 |
| 卷号 | 92页码:35 |
| ISSN号 | 0556-2813 |
| DOI | 10.1103/PhysRevC.92.024912 |
| 英文摘要 | We report on measurements of dielectron (e(+) e(-)) production in Au + Au collisions at a center-of-mass energy of 200 GeV per nucleon-nucleon pair using the STAR detector at BNL Relativistic Heavy Ion Collider. Systematic measurements of the dielectron yield as a function of transverse momentum (p(T)) and collision centrality show an enhancement compared to a cocktail simulation of hadronic sources in the low invariant-mass region (M-ee < 1 GeV / c(2)). This enhancement cannot be reproduced by the rho-meson vacuum spectral function. In minimum-bias collisions, in the invariant-mass range of 0.30-0.76 GeV / c(2), integrated over the full pT acceptance, the enhancement factor is 1.76 +/- 0.06 (stat.) +/- 0.26 (sys.) +/- 0.29 (cocktail). The enhancement factor exhibits weak centrality and pT dependence in STAR's accessible kinematic regions, while the excess yield in this invariant-mass region as a function of the number of participating nucleons follows a power-law shape with a power of 1.44 +/- 0.10. Models that assume an in-medium broadening of the rho-meson spectral function consistently describe the observed excess in these measurements. Additionally, we report on measurements of omega-and phi-meson production through their e+ e(-) decay channel. These measurements show good agreement with Tsallis blast-wave model predictions, as well as, in the case of the phi meson, results through its K+ K- decay channel. In the intermediate invariant-mass region (1.1 < Mee < 3 GeV / c(2)), we investigate the spectral shapes from different collision centralities. Physics implications for possible in-medium modification of charmed hadron production and other physics sources are discussed. |
| WOS关键词 | RELATIVISTIC NUCLEAR COLLISIONS ; SUPER-PROTON SYNCHROTRON ; HEAVY-ION COLLISIONS ; DILEPTON PRODUCTION ; CHIRAL RESTORATION ; TRANSPORT APPROACH ; SPS ENERGIES ; CERN-SPS ; MULTIPLICITY ; FLOW |
| 资助项目 | RHIC Operations Group ; RCF at BNL ; NERSC Center at LBNL ; KISTI Center in Korea ; Open Science Grid consortium ; Office of Nuclear Physics within the U.S. DOE Office of Science ; U.S. NSF[CNRS/IN2P3] ; FAPESP CNPq of Brazil ; Ministry of Education and Science of the Russian Federation ; NNSFC ; MoST of China (973 Program)[2014CB845400] ; MoST of China (973 Program)[2015CB856900] ; MoE of China ; CAS ; Korean Research Foundation ; GA of the Czech Republic ; MSMT of the Czech Republic ; FIAS of Germany ; DAE of India ; DST of India ; CSIR of India ; National Science Centre of Poland; National Research Foundation[NRF-2012004024] ; Ministry of Science, Education and Sports of the Republic of Croatia ; RosAtom of Russia |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| 出版者 | AMER PHYSICAL SOC |
| WOS记录号 | WOS:000359944200007 |
| 资助机构 | RHIC Operations Group ; RCF at BNL ; NERSC Center at LBNL ; KISTI Center in Korea ; Open Science Grid consortium ; Office of Nuclear Physics within the U.S. DOE Office of Science ; U.S. NSF ; FAPESP CNPq of Brazil ; Ministry of Education and Science of the Russian Federation ; NNSFC ; MoST of China (973 Program) ; MoE of China ; CAS ; Korean Research Foundation ; GA of the Czech Republic ; MSMT of the Czech Republic ; FIAS of Germany ; DAE of India ; DST of India ; CSIR of India ; National Science Centre of Poland; National Research Foundation ; Ministry of Science, Education and Sports of the Republic of Croatia ; RosAtom of Russia |
| 源URL | [http://119.78.100.186/handle/113462/40450]  |
| 专题 | 中国科学院近代物理研究所 |
| 通讯作者 | Adamczyk, L. |
| 作者单位 | 1.AGH Univ Sci & Technol, PL-30059 Krakow, Poland 2.Argonne Natl Lab, Argonne, IL 60439 USA 3.Brookhaven Natl Lab, Upton, NY 11973 USA 4.Univ Calif Berkeley, Berkeley, CA 94720 USA 5.Univ Calif Davis, Davis, CA 95616 USA 6.Univ Calif Los Angeles, Los Angeles, CA 90095 USA 7.Cent China Normal Univ HZNU, Wuhan 430079, Peoples R China 8.Univ Illinois, Chicago, IL 60607 USA 9.Creighton Univ, Omaha, NE 68178 USA 10.Czech Tech Univ, Fac Nucl Sci & Phys Engn, CR-11519 Prague, Czech Republic |
| 推荐引用方式 GB/T 7714 | Adamczyk, L.,Adkins, J. K.,Agakishiev, G.,et al. Measurements of dielectron production in Au plus Au collisions at root s(NN)=200 GeV from the STAR experiment[J]. PHYSICAL REVIEW C,2015,92:35. |
| APA | Adamczyk, L..,Adkins, J. K..,Agakishiev, G..,Aggarwal, M. M..,Ahammed, Z..,...&Zyzak, M..(2015).Measurements of dielectron production in Au plus Au collisions at root s(NN)=200 GeV from the STAR experiment.PHYSICAL REVIEW C,92,35. |
| MLA | Adamczyk, L.,et al."Measurements of dielectron production in Au plus Au collisions at root s(NN)=200 GeV from the STAR experiment".PHYSICAL REVIEW C 92(2015):35. |
入库方式： OAI收割
来源：近代物理研究所
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