Improved measurement of the longitudinal spin transfer to Lambda and (Lambda)over-bar hyperons in polarized proton-proton collisions at root s=200 GeV

doi:10.1103/PhysRevD.98.112009

	Improved measurement of the longitudinal spin transfer to Lambda and (Lambda)over-bar hyperons in polarized proton-proton collisions at root s=200 GeV
	Adam, J.12; Adamczyk, L.2; Adams, J. R.35; Adkins, J. K.26; Agakishiev, G.24; Aggarwal, M. M.37; Ahammed, Z.57; Alekseev, I.3,31; Anderson, D. M.51; Aoyama, R.54
刊名	PHYSICAL REVIEW D
	2018-12-20
卷号	98
ISSN号	2470-0010
DOI	10.1103/PhysRevD.98.112009
英文摘要	The longitudinal spin transfer D-LL to Lambda and (Lambda) over bar hyperons produced in high-energy polarized proton-proton collisions is expected to be sensitive to the helicity distribution functions of strange quarks and antiquarks of the proton, and to longitudinally polarized fragmentation functions. We report an improved measurement of D-LL from data obtained at a center-of-mass energy of root s = 200 GeV with the STAR detector at RHIC. The data have an approximately twelve times larger figure of merit than prior results and cover vertical bar eta vertical bar<1.2 in pseudorapidity with transverse momenta p(T) up to 6 GeV/c. In the forward scattering hemisphere at largest p(T), the longitudinal spin transfer is found to be D-LL = - 0.036 +/- 0.048 (stat) +/- 0.013 (sys) for Lambda hyperons and D-LL = 0.032 +/- 0.043 (stat) +/- 0.013(sys) for <(Lambda)over bar> antihyperons. The dependences on eta and p(T) are presented and compared with model evaluations.
WOS关键词	CHARGED CURRENT INTERACTIONS ; BARYON PRODUCTION ; PP COLLISIONS
WOS研究方向	Astronomy & Astrophysics ; Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000454168500001
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/64481]
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.Abilene Christian Univ, Abilene, TX 79699 USA 2.AGH Univ Sci & Technol, FPACS, PL-30059 Krakow, Poland 3.Alikhanov Inst Theoret & Expt Phys, Moscow 117218, Russia 4.Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA 5.Brookhaven Natl Lab, Upton, NY 11973 USA 6.Univ Calif Berkeley, Berkeley, CA 94720 USA 7.Univ Calif Davis, Davis, CA 95616 USA 8.Univ Calif Los Angeles, Los Angeles, CA 90095 USA 9.Univ Calif Riverside, Riverside, CA 92521 USA 10.Cent China Normal Univ, Wuhan 430079, Hubei, Peoples R China
推荐引用方式 GB/T 7714	Adam, J.,Adamczyk, L.,Adams, J. R.,et al. Improved measurement of the longitudinal spin transfer to Lambda and (Lambda)over-bar hyperons in polarized proton-proton collisions at root s=200 GeV[J]. PHYSICAL REVIEW D,2018,98.
APA	Adam, J..,Adamczyk, L..,Adams, J. R..,Adkins, J. K..,Agakishiev, G..,...&STAR Collaboration.(2018).Improved measurement of the longitudinal spin transfer to Lambda and (Lambda)over-bar hyperons in polarized proton-proton collisions at root s=200 GeV.PHYSICAL REVIEW D,98.
MLA	Adam, J.,et al."Improved measurement of the longitudinal spin transfer to Lambda and (Lambda)over-bar hyperons in polarized proton-proton collisions at root s=200 GeV".PHYSICAL REVIEW D 98(2018).