Di-electron spectrum at mid-rapidity in p+p collisions at root s=200 GeV

doi:10.1103/PhysRevC.86.024906

	Di-electron spectrum at mid-rapidity in p+p collisions at root s=200 GeV
	Adamczyk, L.1; Agakishiev, G.20; Aggarwal, M. M.31; Ahammed, Z.50; Alakhverdyants, A. V.20; Alekseev, I.18; Alford, J.21; Anderson, B. D.21; Anson, C. D.29; Arkhipkin, D.3
刊名	PHYSICAL REVIEW C
	2012-08-08
卷号	86
ISSN号	0556-2813
DOI	10.1103/PhysRevC.86.024906
文献子类	Article
英文摘要	We report on the mid-rapidity mass spectrum of di-electrons and cross sections of pseudoscalar and vector mesons via e(+) e(-) decays, from root s = 200 GeV p + p collisions, measured by the large-acceptance experiment STAR at the Relativistic Heavy Ion Collider. The ratio of the di-electron continuum to the combinatorial background is larger than 10% over the entire mass range. Simulations of di-electrons from light-meson decays and heavy-flavor decays (charmonium and open charm correlation) are found to describe the data. The extracted omega -> e(+) e(-) invariant yields are consistent with previous measurements. The mid-rapidity yields (dN/dy) of phi and J/psi are extracted through their di-electron decay channels and are consistent with the previous measurements of phi -> K+ K- and J/psi -> e(+) e(-). Our results suggest a new upper limit of the branching ratio of the eta -> e(+) e(-) of 1.7 x 10(-5) at the 90% confidence level.
WOS关键词	QUARK-GLUON PLASMA ; RESISTIVE PLATE CHAMBERS ; PARTICLE IDENTIFICATION ; TRANSVERSE-MOMENTUM ; D+AU COLLISIONS ; STAR EXPERIMENT ; DECAYS ; COLLABORATION ; RESTORATION ; PERSPECTIVE
WOS研究方向	Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000307274900004
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/49023]
专题	中国科学院近代物理研究所
通讯作者	Adamczyk, L.
作者单位	1.AGH Univ Sci & Technol, Krakow, Poland 2.Argonne Natl Lab, 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.Univ Estadual Campinas, Sao Paulo, Brazil 8.Cent China Normal Univ HZNU, Wuhan 430079, Peoples R China 9.Univ Illinois, Chicago, IL 60607 USA 10.Krakow Univ Technol, Krakow, Poland
推荐引用方式 GB/T 7714	Adamczyk, L.,Agakishiev, G.,Aggarwal, M. M.,et al. Di-electron spectrum at mid-rapidity in p+p collisions at root s=200 GeV[J]. PHYSICAL REVIEW C,2012,86.
APA	Adamczyk, L..,Agakishiev, G..,Aggarwal, M. M..,Ahammed, Z..,Alakhverdyants, A. V..,...&STAR Collaboration.(2012).Di-electron spectrum at mid-rapidity in p+p collisions at root s=200 GeV.PHYSICAL REVIEW C,86.
MLA	Adamczyk, L.,et al."Di-electron spectrum at mid-rapidity in p+p collisions at root s=200 GeV".PHYSICAL REVIEW C 86(2012).