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题名: Soft gluon approach for diffractive photoproduction of J/psi
作者: Ma, JP ;  Xu, JS
刊名: NUCLEAR PHYSICS B
出版日期: 2002
卷号: 640, 期号:40910, 页码:283-308
关键词: VIRTUAL COMPTON-SCATTERING ;  EFFECTIVE FIELD-THEORY ;  PARTON DISTRIBUTIONS ;  VECTOR-MESONS ;  HEAVY QUARKS ;  QCD ;  HERA ;  ELECTROPRODUCTION ;  DECAY ;  FACTORIZATION
学科分类: Physics
通讯作者: Ma, JP , 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; China Ctr Adv Sci & Technol, World Lab, Beijing 100080, Peoples R China
英文摘要: 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.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000178258700011
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/13431
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:
Ma, JP,Xu, JS. Soft gluon approach for diffractive photoproduction of J/psi[J]. NUCLEAR PHYSICS B,2002,640(40910):283-308.
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