Diffractive photoproduction of eta(c)

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	Diffractive photoproduction of eta(c)
	Ma, JP; Ma, JP , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.
刊名	NUCLEAR PHYSICS A
	2003
卷号	727 期号:40972 页码:333-352
关键词	Short-distance Analysis Effective Field-theory Pp Elastic-scattering Heavy-quark Systems Quantum Chromodynamics Parton Distributions Hadronic Transitions Meson Production Exclusive Decay 2 Pions
ISSN号	0375-9474
英文摘要	Diffractive photoproduction of eta(c) is an important process to study the effect of Odderon, whose existence is still not confirmed in experiment. A detailed interpretation of Odderon in QCD, i.e., in terms of gluons is also unclear. Taking charm quarks as heavy quarks, we can use NRQCD and take eta(c) as a cc bound state. Hence, in the production of eta(c) a free cc pair is first produced and this pair is transformed into eta(c) subsequently. In the forward region of the kinematics, the cc pair interacts with initial hadron through exchanges of soft gluons. This interaction can be studied with HQET, which provides a systematic expansion in the inverse of the c quark mass m(c). We find that the calculation of the S-matrix element in the forward region can be formulated as the problem of solving a wave function of a c quark propagating in a background field of soft gluons. At leading order we find that the differential cross-section can be expressed with four functions, which are defined with a twist-3 operator of gluons. The effect of exchanging a Odderon can be identified with this operator in our case. We discuss our results in detail and compare them with those obtained in previous studies. Our results and those from other studies show that the differential cross-section is very small in the forward region. We also show that the production through photon exchange is dominant in the extremely forward region, hence the effect of Odderon exchange cannot be identified in this region. For completeness we also give results for diffractive photoproduction of J/Psi. (C) 2003 Elsevier B.V. All rights reserved.
学科主题	Physics
URL标识	查看原文
WOS记录号	WOS:000186022600008
公开日期	2012-08-30
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/14183]
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	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,Ma, JP , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.. Diffractive photoproduction of eta(c)[J]. NUCLEAR PHYSICS A,2003,727(40972):333-352.
APA	Ma, JP,&Ma, JP , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China..(2003).Diffractive photoproduction of eta(c).NUCLEAR PHYSICS A,727(40972),333-352.
MLA	Ma, JP,et al."Diffractive photoproduction of eta(c)".NUCLEAR PHYSICS A 727.40972(2003):333-352.