Soft gluon approach for diffractive photoproduction of J/psi

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	Ma, JP; Xu, JS; Ma, JP , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.
	Soft gluon approach for diffractive photoproduction of J/psi
发表期刊	NUCLEAR PHYSICS B
关键词	Virtual Compton-scattering Effective Field-theory Parton Distributions Vector-mesons Heavy Quarks Qcd Hera Electroproduction Decay Factorization
摘要	We study diffractive photoproduction of J/psi by taking the charm quark as a heavy quark. A description of nonperturbative effect related to J/psi can be made by using NRQCD. In the forward region of the kinematics, the interaction between the cc-pair and the initial hadron is due to exchange of soft gluons. The effect of the exchange can be studied by using the expansion in the inverse of the quark mass m(c), At the leading order we find that the nonperturbative effect related to the initial hadron is represented by a matrix element of field strength operators, which are separated in the moving direction of J/psi in the spacetime. The S-matrix element is then obtained without using perturbative QCD and the results are not based on any model. Corrections to the results can be systematically added. Keeping the dominant contribution of the S-matrix element in the large energy limit we find that the imaginary part of the S-matrix element is related to the gluon distribution for x --> 0 with a reasonable assumption, the real part can be obtained with another approximation or with dispersion relation. Our approach is different than previous approaches and also our results are different than those in these approaches. The differences are discussed in detail. A comparison with experiment is also made and a qualitative agreement is found. (C) 2002 Published by Elsevier Science B.V.
	2002
ISSN	0550-3213
卷号	640 期号:40910 页码:283-308
学科领域	Physics
收录类别	SCI
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.itp.ac.cn/handle/311006/13431
专题	理论物理所科研产出_SCI论文
通讯作者	Ma, JP , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.
推荐引用方式 GB/T 7714	Ma, JP,Xu, JS,Ma, JP , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.. Soft gluon approach for diffractive photoproduction of J/psi[J]. NUCLEAR PHYSICS B,2002,640(40910):283-308.
APA	Ma, JP,Xu, JS,&Ma, JP , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China..(2002).Soft gluon approach for diffractive photoproduction of J/psi.NUCLEAR PHYSICS B,640(40910),283-308.
MLA	Ma, JP,et al."Soft gluon approach for diffractive photoproduction of J/psi".NUCLEAR PHYSICS B 640.40910(2002):283-308.

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