QCD analysis of quark recombination for leading particle effect

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	QCD analysis of quark recombination for leading particle effect
	Chang, CH; Ma, JP; Si, ZG; Chang, CH , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.
刊名	PHYSICAL REVIEW D
	2003
卷号	68 期号:1 页码:-
关键词	Odd Parton Distributions Effective Field-theory Gev/c Pi(-) Charm Photoproduction Nucleon-interactions Transverse-momentum Meson Production Heavy Mesons Feynman-x Asymmetries
ISSN号	0556-2821
英文摘要	The quark recombination mechanism is proposed to explain the asymmetry between production rates of D+ and of D- in their inclusive production, and also asymmetries for other charmed hadrons. These asymmetries are observed in experiment and are called leading particle effects. In this work we give a general analysis for contributions of quark recombination to these asymmetries. The contributions consist of a perturbative and nonperturbative part. We perform two types of factorization by considering the produced hadron with a large transverse momentum and by taking the charm quark as a heavy quark, respectively. In the case of the large transverse momentum the effect of quark recombination is the standard twist-4 effect. We find that the contributions are parametrized with four nonperturbative functions, defined with four quark operators at twist-4, for initial hadrons without polarization. By taking the charm quark as a heavy quark the factorization can be performed with the heavy quark effective theory (HQET). The effect of quark recombination is in general parametrized by eight nonperturbative parameters which are defined as integrals with the matrix elements of four quark operators defined in HQET. For unpolarized hadrons in the initial state, the parameters can effectively be reduced to four. The perturbative parts in the two types of factorization are calculated at the tree level.
学科主题	Physics
URL标识	查看原文
WOS记录号	WOS:000184583700037
公开日期	2012-08-29
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/13270]
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	Chang, CH , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.
推荐引用方式 GB/T 7714	Chang, CH,Ma, JP,Si, ZG,et al. QCD analysis of quark recombination for leading particle effect[J]. PHYSICAL REVIEW D,2003,68(1):-.
APA	Chang, CH,Ma, JP,Si, ZG,&Chang, CH , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China..(2003).QCD analysis of quark recombination for leading particle effect.PHYSICAL REVIEW D,68(1),-.
MLA	Chang, CH,et al."QCD analysis of quark recombination for leading particle effect".PHYSICAL REVIEW D 68.1(2003):-.