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题名: Diffractive photoproduction of eta(c)
作者: Ma, JP
刊名: NUCLEAR PHYSICS A
出版日期: 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
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
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.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000186022600008
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/14183
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. Diffractive photoproduction of eta(c)[J]. NUCLEAR PHYSICS A,2003,727(40972):333-352.
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