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题名: Single Transverse Spin Asymmetries at Parton Level
作者: Cao Hui-Geng ;  Ma Jian-Ping ;  Sang Hua-Zheng
刊名: COMMUNICATIONS IN THEORETICAL PHYSICS
出版日期: 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
学科分类: Physics
通讯作者: Cao, HG , Beijing Univ Civil Engn & Architecture, Sch Sci, Beijing 100044, Peoples R China
部门归属: [Cao, HG] Beijing Univ Civil Engn & Architecture, Sch Sci, Beijing 100044, Peoples R China; [Ma, JP; Sang, HZ] Acad Sinica, Inst Theoret Phys, Beijing 100190, Peoples R China; [Sang, HZ] E China Inst Theoret Phys, Sch Sci, Inst Modern Phys, Shanghai 200237, Peoples R China
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.
资助者: National Natural Science Foundation of China[10721063, 10575126, 10975169]
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000275133900021
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5167
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Cao Hui-Geng,Ma Jian-Ping,Sang Hua-Zheng. Single Transverse Spin Asymmetries at Parton Level[J]. COMMUNICATIONS IN THEORETICAL PHYSICS,2010,53(2):313-324.
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