Measurements of the chiral magnetic effect with background isolation in 200 GeV Au+Au collisions at STAR
文献类型：期刊论文
| 作者 | Zhao, J; Adam, J; Adamczyk, L; Adams, JR; Adkins, JK; Agakishiev, G; Aggarwal, MM; Ahammed, Z; Alekseev, I; Anderson, DM |
| 刊名 | NUCLEAR PHYSICS A
 |
| 出版日期 | 2019 |
| 卷号 | 982期号:-页码:535—538 |
| ISSN号 | 0375-9474 |
| DOI | 10.1016/j.nuclphysa.2018.08.035 |
| 文献子类 | 期刊论文 |
| 英文摘要 | Using two novel methods, pair invariant mass (m(inv)) and comparative measurements with respect to reaction plane (Psi(RP)) and participant plane (Psi(PP)), we isolate the possible chiral magnetic effect (CME) from backgrounds in 200 GeV Au+Au collisions at STAR. The invariant mass method identifies the resonance background contributions, coupled with the elliptic flow (v(2)), to the charge correlator CME observable (Delta gamma). At high mass (m(inv) > 1.5 GeV/c(2)) where resonance contribution is small, we obtain the average Delta gamma magnitude. In the low mass region (m(inv) < 1.5 GeV/c(2)), resonance peaks are observed in Delta gamma(m(inv)). An event shape engineering (ESE) method is used to model the background shape in m(inv) to extract the potential CME signal at low m(inv). In the comparative method, the Psi(RP) is assessed by spectator neutrons measured by the ZDCs, and the Psi(PP) by the 2nd-harmonic event plane measured by the TPC. The v(2) is stronger along Psi(PP) and weaker along Psi(RP); in contrast, the magnetic field, mainly from spectator protons, is weaker along Psi(PP) and stronger along Psi(RP). As a result, the Delta gamma measured with respect to Psi(RP) and Psi(PP) contain different amounts of CME and background, and can thus determine these two contributions. It is found that the possible CME signals with background isolation by these two novel methods are small, on the order of a few percent of the inclusive Delta gamma measurements. |
| 语种 | 英语 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/31702]  |
| 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.Purdue Univ, Dept Phys & Astron, W Lafayette, IN 47906 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 | Zhao, J,Adam, J,Adamczyk, L,et al. Measurements of the chiral magnetic effect with background isolation in 200 GeV Au+Au collisions at STAR[J]. NUCLEAR PHYSICS A,2019,982(-):535—538. |
| APA | Zhao, J.,Adam, J.,Adamczyk, L.,Adams, JR.,Adkins, JK.,...&Zyzak, M.(2019).Measurements of the chiral magnetic effect with background isolation in 200 GeV Au+Au collisions at STAR.NUCLEAR PHYSICS A,982(-),535—538. |
| MLA | Zhao, J,et al."Measurements of the chiral magnetic effect with background isolation in 200 GeV Au+Au collisions at STAR".NUCLEAR PHYSICS A 982.-(2019):535—538. |
入库方式： OAI收割
来源：上海应用物理研究所
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