Measurement of the Target-Normal Single-Spin Asymmetry in Quasielastic Scattering from the Reaction He-3(up arrow) (e,e ')

doi:10.1103/PhysRevLett.115.172502

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	Measurement of the Target-Normal Single-Spin Asymmetry in Quasielastic Scattering from the Reaction He-3(up arrow) (e,e ')
	Zhang, YW; Long, E; Mihovilovic, M; Jin, G; Allada, K; Anderson, B; Annand, JRM; Averett, T; Ayerbe-Gayoso, C; Boeglin, W
刊名	PHYSICAL REVIEW LETTERS
	2015-10-22
卷号	115 期号:17
ISSN号	0031-9007
DOI	10.1103/PhysRevLett.115.172502
其他题名	Measurement of the Target-Normal Single-Spin Asymmetry in Quasielastic Scattering from the Reaction He 3 ↑ (e,e′)
文献子类	Article
英文摘要	We report the first measurement of the target single-spin asymmetry, A(y), in quasielastic scattering from the inclusive reaction He-3(up arrow)(e,e') on a He-3 gas target polarized normal to the lepton scattering plane. Assuming time-reversal invariance, this asymmetry is strictly zero for one-photon exchange. A nonzero A(y) can arise from the interference between the one-and two-photon exchange processes which is sensitive to the details of the substructure of the nucleon. An experiment recently completed at Jefferson Lab yielded asymmetries with high statistical precision at Q(2) = 0.13, 0.46, and 0.97 GeV2. These measurements demonstrate, for the first time, that the He-3 asymmetry is clearly nonzero and negative at the 4 sigma-9 sigma level. Using measured proton-to-He-3 cross-section ratios and the effective polarization approximation, neutron asymmetries of -(1-3)% were obtained. The neutron asymmetry at high Q(2) is related to moments of the generalized parton distributions (GPDs). Our measured neutron asymmetry at Q(2) = 0.97 GeV2 agrees well with a prediction based on two-photon exchange using a GPD model and thus provides a new, independent constraint on these distributions.
学科主题	Physics
出版地	COLLEGE PK
资助项目	国家自然科学基金项目 ; 美国能源部项目
项目编号	U.S. National Science Foundation ; U.S. Department of Energy ; DOE Contract [DE-AC05-06OR23177] ; National Science Foundation of China ; UK STFC Grants [57071/1, 50727/1]
语种	英语
WOS记录号	WOS:000363244400004
资助机构	NSFC ; US DOE
内容类型	期刊论文
源URL	[http://ir.lzu.edu.cn/handle/262010/178454]
专题	学院待认领_期刊论文
通讯作者	Averett, T (reprint author), Rutgers State Univ, New Brunswick, NJ 08901 USA.
推荐引用方式 GB/T 7714	Zhang, YW,Long, E,Mihovilovic, M,et al. Measurement of the Target-Normal Single-Spin Asymmetry in Quasielastic Scattering from the Reaction He-3(up arrow) (e,e ')[J]. PHYSICAL REVIEW LETTERS,2015,115(17).
APA	Zhang, YW.,Long, E.,Mihovilovic, M.,Jin, G.,Allada, K.,...&Averett, T .(2015).Measurement of the Target-Normal Single-Spin Asymmetry in Quasielastic Scattering from the Reaction He-3(up arrow) (e,e ').PHYSICAL REVIEW LETTERS,115(17).
MLA	Zhang, YW,et al."Measurement of the Target-Normal Single-Spin Asymmetry in Quasielastic Scattering from the Reaction He-3(up arrow) (e,e ')".PHYSICAL REVIEW LETTERS 115.17(2015).