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Chang, CH; Ma, JP; Si, ZG; Chang, CH , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.
QCD analysis of quark recombination for leading particle effect
Source PublicationPHYSICAL REVIEW D
KeywordOdd Parton Distributions Effective Field-theory Gev/c Pi(-) Charm Photoproduction Nucleon-interactions Transverse-momentum Meson Production Heavy Mesons Feynman-x Asymmetries
AbstractThe 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.
2003
ISSN0556-2821
Volume68Issue:1Pages:-
Subject AreaPhysics
Indexed BySCI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/13270
Collection理论物理所科研产出_SCI论文
Corresponding AuthorChang, CH , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.
Recommended Citation
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):-.
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