Measurements of the chiral magnetic effect with background isolation in 200 GeV Au+Au collisions at STAR

doi:10.1016/j.nuclphysa.2018.08.035

	Measurements of the chiral magnetic effect with background isolation in 200 GeV Au+Au collisions at STAR
	Zhao, Jie 1; Adam, J.13; Adamczyk, L.3; Adams, J. R.36; Adkins, J. K.27; Agakishiev, G.25; Aggarwal, M. M.38; Ahammed, Z.58; Alekseev, I.4,32; Anderson, D. M.52
刊名	NUCLEAR PHYSICS A
	2019-02-01
卷号	982 页码:535-538
关键词	QCD heavy-ion collisions chiral magnetic effect invariant mass reaction plane participant plane
ISSN号	0375-9474
DOI	10.1016/j.nuclphysa.2018.08.035
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.
资助项目	U.S. Department of Energy ; NSFC of China[11505073]
WOS研究方向	Physics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000457515500119
资助机构	U.S. Department of Energy ; NSFC of China
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/66045]
专题	中国科学院近代物理研究所
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, Jie,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, Jie.,Adam, J..,Adamczyk, L..,Adams, J. R..,Adkins, J. K..,...&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, Jie,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.