Observation of Excess J/psi Yield at Very Low Transverse Momenta in Au plus Au Collisions at root S-NN =200 GeV and U+U Collisions at root S-NN =193 GeV
文献类型：期刊论文
| 作者 | Adam, J; Adamczyk, L; Adams, JR; Adkins, JK; Agakishiev, G; Aggarwal, MM; Ahammed, Z; Alekseev, I; Anderson, DM; Aoyama, R |
| 刊名 | PHYSICAL REVIEW LETTERS
 |
| 出版日期 | 2019 |
| 卷号 | 123期号:13页码:- |
| ISSN号 | 0031-9007 |
| 关键词 | PB-PB COLLISIONS PHOTOPRODUCTION SUPPRESSION |
| DOI | 10.1103/PhysRevLett.123.132302 |
| 文献子类 | 期刊论文 |
| 英文摘要 | We report on the first measurements of J/psi production at very low transverse momentum (p(T) < 0.2 GeV/c) in hadronic Au + Au collisions at root S-NN = 200 GeV and U + U collisions at ONN = 193 GeV. Remarkably, the inferred nuclear modification factor of J/psi at midrapidity in Au + Au (U + U) collisions reaches about 24 (52) for p(T) < 0.05 GeV/c in the 60%-80% collision centrality class. This noteworthy enhancement cannot be explained by hadronic production accompanied by cold and hot medium effects. In addition, the dN/dt distribution of J/psi for the very low p(T) range is presented for the first time. The distribution is consistent with that expected from the Au nucleus and shows a hint of interference. Comparison of the measurements to theoretical calculations of coherent production shows that the excess yield can be described reasonably well and reveals a partial disruption of coherent production in semicentral collisions, perhaps due to the violent hadronic interactions. Incorporating theoretical calculations, the results strongly suggest that the dramatic enhancement of J/psi yield observed at extremely low p(T) originates from coherent photon-nucleus interactions. In particular, coherently produced J/psi in violent hadronic collisions may provide a novel probe of the quark-gluon plasma. |
| 语种 | 英语 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/32148]  |
| 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 |
| 作者单位 | 1.Yale Univ, New Haven, CT 06520 USA 2.Abilene Christian Univ, Abilene, TX 79699 USA; 3.AGH Univ Sci & Technol, FPACS, PL-30059 Krakow, Poland; 4.Alikhanov Inst Theoret & Expt Phys, Moscow 117218, Russia; 5.Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA; 6.Brookhaven Natl Lab, Upton, NY 11973 USA; 7.Univ Calif Berkeley, Berkeley, CA 94720 USA; 8.Univ Calif Davis, Davis, CA 95616 USA; 9.Univ Calif Los Angeles, Los Angeles, CA 90095 USA; 10.Univ Calif Riverside, Riverside, CA 92521 USA; |
| 推荐引用方式 GB/T 7714 | Adam, J,Adamczyk, L,Adams, JR,et al. Observation of Excess J/psi Yield at Very Low Transverse Momenta in Au plus Au Collisions at root S-NN =200 GeV and U+U Collisions at root S-NN =193 GeV[J]. PHYSICAL REVIEW LETTERS,2019,123(13):-. |
| APA | Adam, J.,Adamczyk, L.,Adams, JR.,Adkins, JK.,Agakishiev, G.,...&Zyzak, M.(2019).Observation of Excess J/psi Yield at Very Low Transverse Momenta in Au plus Au Collisions at root S-NN =200 GeV and U+U Collisions at root S-NN =193 GeV.PHYSICAL REVIEW LETTERS,123(13),-. |
| MLA | Adam, J,et al."Observation of Excess J/psi Yield at Very Low Transverse Momenta in Au plus Au Collisions at root S-NN =200 GeV and U+U Collisions at root S-NN =193 GeV".PHYSICAL REVIEW LETTERS 123.13(2019):-. |
入库方式： OAI收割
来源：上海应用物理研究所
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