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题名: QCD analysis of quark recombination for leading particle effect
作者: Chang, CH ;  Ma, JP ;  Si, ZG
刊名: PHYSICAL REVIEW D
出版日期: 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
学科分类: Physics
通讯作者: Chang, CH , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.
部门归属: Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China; Shandong Univ, Dept Phys, Jinan 250100, Peoples R China
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.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000184583700037
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/13270
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:
Chang, CH,Ma, JP,Si, ZG. QCD analysis of quark recombination for leading particle effect[J]. PHYSICAL REVIEW D,2003,68(1):-.
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