摘要
基于推广的QCD向量介子为主的模型(QCD-VMD)和具有QCD特征的程函近似,研究了光子-光子的相互作用。与通常用费曼盒子图计算光子-光子的相互作用不同,采用QCD理论揭示了光子-光子的相互作用过程,认为光子-光子的弹性散射是通过两个散射的光子所涨落成的两个夸克-反夸克对之间的强相互作用而进行的。由于强相互作用的传播子是带色的胶子和胶子的自相互作用的性质,交换的胶子可以形成无色的胶子球,无色的张量胶子球(两个雷其化的胶子束缚态)和Odderon(三个雷其化的胶子束缚态),可以是两个夸克-反夸克对之间的作用的媒介子,这个机制非常不同于其他理论描述,特别是考虑了由虚胶子(束缚夸克和反夸克形成的涨落介子)的贡献。计算了总截面σtot,微分截面dσ/dt,向前散射振幅实部与虚部的比率ρ和γγ弹性散射的核斜率参数函数β。在实验误差的范围内,对总截面σtot的理论预言和实验数据是一致的,但急需dσ/dt,ρ和β的实验数据来检验本理论模型。
Based on the generalized QCD vector meson dominance model and the QCD Inspired Eikonalized approximation,γγinteraction has been studied in this paper.Unlike the usual calculations of theγγinteraction by the Feynman box diagram technique,we explore the process by QCD theory in whichγγelastic scattering proceeds through a strong interaction between two pairs of quark-antiquark fluctuated by two scattering photons.Due to the fact that the mediator of strong interaction is colorful gluon,and gluon has a property of self-interaction which can bind exchanging gluons together to form glueballs.The colorless tensor glueball(two Reggeized gluon bound state) and Odderon(three Reggeized gluon bound state) could be the mediators of the interaction between the two quark-antiquark pairs.This mechanism is very different from the other theoretical descriptions of the process.In particular,the contributions from virtual gluon,bound quark-antiquark to form a fluctuated meson,are taken into account.We calculate the total cross sectionσ tot,the differential cross section dσ / dt,the ratio of the real part to the imaginary part of the forward scattering amplitude ρ,and the nuclear slope parameter function β ofγγelastic scattering.Our theoretical predictions forσ tot are consistent with the experimental data within error bars of the data.The data for dσ / dt,ρ and β are urgently needed to test our theoretical model.
出处
《原子核物理评论》
CAS
CSCD
北大核心
2012年第4期344-352,共9页
Nuclear Physics Review
基金
National Natural Science Foundation of China(10647002)
Guangxi Natural Science Foundation for Young Researchers(0991009)
Foundation of Guangxi Education Department(200807MS112)
Department of Science and Technology of Guangxi(2011GXNSFA018140)~~
