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; Adkins, JK; Agakishiev, G; Aggarwal, MM; Ahammed, Z; Alekseev, I; Alford, J; Aparin, A; Arkhipkin, D; Aschenauer, EC |
| 刊名 | PHYSICAL REVIEW C
 |
| 出版日期 | 2015 |
| 卷号 | 92期号:2页码:— |
| 关键词 | RELATIVISTIC NUCLEAR COLLISIONS SUPER-PROTON SYNCHROTRON HEAVY-ION COLLISIONS DILEPTON PRODUCTION CHIRAL RESTORATION TRANSPORT APPROACH SPS ENERGIES CERN-SPS MULTIPLICITY FLOW |
| ISSN号 | 0556-2813 |
| 通讯作者 | Adamczyk, L (reprint author), AGH Univ Sci & Technol, PL-30059 Krakow, Poland. |
| 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. |
| 语种 | 英语 |
| WOS记录号 | WOS:000359944200007 |
| 公开日期 | 2016-03-08 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/24985]  |
| 专题 | 上海应用物理研究所_中科院上海应用物理研究所2011-2017年 |
| 推荐引用方式 GB/T 7714 | Adamczyk, L,Adkins, JK,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(2):—. |
| APA | Adamczyk, L.,Adkins, JK.,Agakishiev, G.,Aggarwal, MM.,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(2),—. |
| 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 92.2(2015):—. |
入库方式： OAI收割
来源：上海应用物理研究所
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