Low-p(T) e(+)e(-) Pair Production in Au plus Au Collisions at root s(NN)=200 GeV and U plus U Collisions at root s(NN)=193 GeV at STAR
文献类型：期刊论文
| 作者 | Adam, J.9; Adamczyk, L.1; Adams, J. R.31; Adkins, J. K.21; Agakishiev, G.19; Aggarwal, M. M.33; Ahammed, Z.56; Ajitanand, N. N.44; Alekseev, I.17,28; Anderson, D. M.46 |
| 刊名 | PHYSICAL REVIEW LETTERS
 |
| 出版日期 | 2018-09-25 |
| 卷号 | 121页码:132301 |
| ISSN号 | 0031-9007 |
| DOI | 10.1103/PhysRevLett.121.132301 |
| 英文摘要 | We report first measurements of e(+)e(-) pair production in the mass region 0.4 < M-ee < 2.6 GeV/c(2) at low transverse momentum (p(T) < 0.15 GeV/c) in noncentral Au + Au collisions at root s(NN) = 200 GeV and U + U collisions at root s(NN) = 193 GeV. Significant enhancement factors, expressed as ratios of data over known hadronic contributions, are observed in the 40%-80% centrality of these collisions. The excess yields peak distinctly at low p(T) with a width (root < p(T)(2)>) between 40 and 60 MeV/c. The absolute cross section of the excess depends weakly on centrality, while those from a theoretical model calculation incorporating an in-medium broadened rho spectral function and radiation from a quark gluon plasma or hadronic cocktail contributions increase dramatically with an increasing number of participant nucleons. Model calculations of photon-photon interactions generated by the initial projectile and target nuclei describe the observed excess yields but fail to reproduce the p(T)(2) distributions. |
| WOS关键词 | HEAVY-ION COLLISIONS ; SUPER-PROTON SYNCHROTRON ; QUARK-GLUON PLASMA ; PERIPHERAL COLLISIONS ; NUCLEAR COLLISIONS ; MASS E(+)E(-) ; CERN-SPS ; COLLABORATION ; PHOTOPRODUCTION ; MULTIPLICITY |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| 出版者 | AMER PHYSICAL SOC |
| WOS记录号 | WOS:000445603400009 |
| 源URL | [http://119.78.100.186/handle/113462/64393]  |
| 专题 | 中国科学院近代物理研究所 |
| 通讯作者 | Adam, J. |
| 作者单位 | 1.AGH Univ Sci & Technol, FPACS, PL-30059 Krakow, Poland 2.Argonne Natl Lab, 9700 S Cass Ave, 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, Wuhan 430079, Hubei, Peoples R China 8.Univ Illinois, Chicago, IL 60607 USA 9.Creighton Univ, Omaha, NE 68178 USA 10.Czech Tech Univ, FNSPE, Prague 11519, Czech Republic |
| 推荐引用方式 GB/T 7714 | Adam, J.,Adamczyk, L.,Adams, J. R.,et al. Low-p(T) e(+)e(-) Pair Production in Au plus Au Collisions at root s(NN)=200 GeV and U plus U Collisions at root s(NN)=193 GeV at STAR[J]. PHYSICAL REVIEW LETTERS,2018,121:132301. |
| APA | Adam, J..,Adamczyk, L..,Adams, J. R..,Adkins, J. K..,Agakishiev, G..,...&STAR Collaboration.(2018).Low-p(T) e(+)e(-) Pair Production in Au plus Au Collisions at root s(NN)=200 GeV and U plus U Collisions at root s(NN)=193 GeV at STAR.PHYSICAL REVIEW LETTERS,121,132301. |
| MLA | Adam, J.,et al."Low-p(T) e(+)e(-) Pair Production in Au plus Au Collisions at root s(NN)=200 GeV and U plus U Collisions at root s(NN)=193 GeV at STAR".PHYSICAL REVIEW LETTERS 121(2018):132301. |
入库方式： OAI收割
来源：近代物理研究所
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