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Internal Structure of Hadrons

强子的内部结构

基本信息

批准号：
10640277
负责人：
KUMANO Shunzo
金额：
$ 1.86万
依托单位：
SAGA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10640277/
关键词：
strucdture funciton proton deuteron spin parton quark gluon QCD

项目摘要

1. Flavor asymmetry in antiquark distributionsWe summarized experimental and theoretical papers on Gottfried-sum-rule violation and antiquark flavor asymmetry u - d, and it was published in Physics Reports. Then, a typical meson-cloud model was used for investigating polarized antiquark flavor asymmetry. The results show Δd excess over Δu, and it could be tested experimentally in the near future.2. Polarized proton-deuteron Drell-Yan process and spin-dependent structure functions in the deuteronPolarized proton-deuteron (pd) Drell-Yan processes were investigated for studying new spin structure of a spin-1 hadron. Our formalism indicates that there exist many additional structure functions in comparison with the proton-proton (pp) process. A naive parton model suggests that at least one of them should be related to the tensor polarized distributions, which have not been measured at all. Using this formalism, we found that the difference between the pp and pd cross sections is valuable for finding not only the flavor asymmetry in longitudinally polarized antiquark distributions but also the one in transversity distributions.3. Optimum parton distributions in the nucleon and nucleiPolarized parton distribution functions were determined by using world data from the longitudinally polarized deep inelastic scattering experiments. From our analysis, we proposed one set of LO distributions and two sets of NLO ones as the longitudinally-polarized parton distribution functions. The polarized gluon distribution is difficult to be determined by the analysis, Next, optimum nuclear parton distributions were determined by an analysis of muon and electron deep inelastic scattering data on F^A_2/F^D_2. Although valence-quark distributions are relatively well determined except for the small-x region, antiquark distributions cannot be fixed at medium and large x. It is also difficult to fix gluon distributions.

1.反夸克分布中的味不对称性我们总结了Gottfried求和规则违反和反夸克味不对称性u-d的实验和理论论文，并发表在Physics Reports上。然后，利用典型的介子云模型研究了极化反夸克味不对称性。结果表明，Δd大于Δu，可以在不久的将来进行实验验证.极化质子-氘核Drell-Yan过程和氘核中自旋相关的结构函数研究了极化质子-氘核Drell-Yan过程，以研究自旋为1的强子的新自旋结构.我们的形式主义表明，存在许多额外的结构功能相比，质子-质子（PP）过程。一个朴素的部分子模型表明，它们中至少有一个应该与张量极化分布有关，而张量极化分布根本没有被测量过。利用这种形式，我们发现pp和pd截面的差异不仅对发现纵向极化反夸克分布的味不对称性有价值，而且对发现横向极化反夸克分布的味不对称性也有价值.利用纵向极化深度非弹性散射实验的世界数据，确定了核子和核子中的最佳部分子分布。根据我们的分析，我们提出了一组LO分布和两组NLO分布作为双极化部分子分布函数。极化胶子的分布很难用分析方法确定。其次，通过对F^A_2/F^D_2上μ子和电子深度非弹性散射数据的分析，确定了最佳的核部分子分布。虽然除了小x区域外，价夸克分布相对较好地确定，但反夸克分布不能固定在中等和大x区域。确定胶子分布也很困难。