Single Transverse Spin Asymmetries at Parton Level

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	Single Transverse Spin Asymmetries at Parton Level
	Ma Jian-Ping; Cao, HG , Beijing Univ Civil Engn & Architecture, Sch Sci, Beijing 100044, Peoples R China; Cao Hui-Geng; Sang Hua-Zheng
刊名	COMMUNICATIONS IN THEORETICAL PHYSICS
	2010
卷号	53 期号:2 页码:313-324
关键词	Deep-inelastic Scattering Final-state Interactions To-back Jets Azimuthal Asymmetries Quark Polarization Hard-scattering Pion-production Drell-yan Qcd Leptoproduction
ISSN号	0253-6102
英文摘要	Two factorization approaches have been proposed for single transverse spin asymmetries. One is the collinear factorization, the other is the transverse-momentum-dependent factorization. They have been previously derived in a formal way by using diagram expansion at hadron level. If the two factorizations hold or can be proven, they should also hold when we replace hadrons with parton states. We examine these two factorizations at parton level with massless partons. It is nontrivial to generate these asymmetries at parton level with massless partons because the asymmetries require helicity-flip and nonzero absorptive parts in scattering amplitudes. By constructing suitable parton states with massless partons we derive the two factorizations for the asymmetry in Drell-Yan processes. It is found from our results that the collinear factorization derived at parton level is not the same as that derived at hadron level. Our results with massless partons confirm those derived with single massive parton state in our previous works.
学科主题	Physics
URL标识	查看原文
WOS记录号	WOS:000275133900021
公开日期	2012-08-02
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/5167]
专题	理论物理研究所_理论物理所1978-2010年知识产出
通讯作者	Cao, HG , Beijing Univ Civil Engn & Architecture, Sch Sci, Beijing 100044, Peoples R China
推荐引用方式 GB/T 7714	Ma Jian-Ping,Cao, HG , Beijing Univ Civil Engn & Architecture, Sch Sci, Beijing 100044, Peoples R China,Cao Hui-Geng,et al. Single Transverse Spin Asymmetries at Parton Level[J]. COMMUNICATIONS IN THEORETICAL PHYSICS,2010,53(2):313-324.
APA	Ma Jian-Ping,Cao, HG , Beijing Univ Civil Engn & Architecture, Sch Sci, Beijing 100044, Peoples R China,Cao Hui-Geng,&Sang Hua-Zheng.(2010).Single Transverse Spin Asymmetries at Parton Level.COMMUNICATIONS IN THEORETICAL PHYSICS,53(2),313-324.
MLA	Ma Jian-Ping,et al."Single Transverse Spin Asymmetries at Parton Level".COMMUNICATIONS IN THEORETICAL PHYSICS 53.2(2010):313-324.