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Hadron Structures with High Energy Polarized Reaction

具有高能极化反应的强子结构

基本信息

批准号：
11694081
负责人：
MORII Toshiyuki
金额：
$ 0.9万
依托单位：
KOBE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11694081/
关键词：
polarized gluon distribution proton spin problem semi-inclusive process charm quark fragmentation light sea-quark asymmetry parton model with QCD Pomeron exchange double charmed baryon unnatural parity exchange vector meson production

项目摘要

(1)We studied the polarized structure function of nucleons in the resonance region based on the quark model and discussed how the sum rule at large Q^2 connects to the GDH sum rule at Q^2=0 limit.(2)In order to extract the polarized gluon distribution Δg, we calculated the spin asymmetry between the initial proton and the produced A_c^+ in the polarized pp reaction and found that it is very promising for extraction information of Δg.(3) From the present data of semi-inclusive processes, we found Δd(x)-Δu(x)<0, i.e.that the light sea-quark flavor is asymmetric.(4) For the J/ψ production at HERA and also for central production of η, η' in pp reactions (WA102), we developed new analyses of Pomeron interaction.(5)By analyzing the ψ' production in polarized γp reaction, we found that it is a good process for testing the color-octet mechanism.(6)From the world data on the polarized structure function of g_1^p (x), g_1^n (x) and g_1^d (x), we made a new parametrization model of the polarized parton disributions.(7)We calculated the mass level of doubly charmed baryons in the Born-Oppenheimer approximation.

(1)We在夸克模型的基础上研究了共振区核子的极化结构函数，讨论了大Q^2时的求和规则与Q^2=0极限时的GDH求和规则之间的联系。(2)In为了提取极化胶子分布Δg，我们计算了极化pp反应中初始质子与产生的A_c^+之间的自旋不对称性，发现这对提取Δg的信息是很有希望的. (3)从现有的半包含过程数据中，我们发现Δd（x）-Δu（x）<0，即轻海夸克味是不对称的。(4)对于HERA的J/π产生以及pp反应（WA 102）中η，η'的中心产生，我们发展了新的Pomeron相互作用分析。(5)By分析了极化γp反应中的γ ′产物，发现这是检验色八隅体机制的一个很好的方法。（6）根据极化结构函数g_1^p（x）、g_1^n（x）和g_1^d（x）的世界数据，我们建立了一个新的极化部分子分布参数化模型。(7)We在玻恩-奥本海默近似下计算了双粲重子的质量级。