极化海夸克对激发对核子的自旋相关性质的影响

分析各种极化的海夸克对对核子的自旋相关性质的作用. 并试图改进传统模型对质子自旋性质的计算.     

核内夸克-胶子分布

介绍与核内夸克－胶子分布的有关实验现象:ＥＭＣ效应、核遮蔽效应、核Ｄｒｅｌ－Ｙａｎ过程和Ｊ／ψ光生反应等,以及解释它们的理论模型．The experiments of the EMC effect,nuclear shadowing effect,nuclear Drell Yanprocess and J/ψ production related to the quark gluon distributions in nuclei and the theoretical models explaining them are briefly reviewed.      

改进的部分子演化模型及其对EMC效应和核Drell–Yan过程的解释

用解析方法证明了部分子演化模型可为双重X重新标度模型提供物理基础,进而利用修正的Alteralli-Parisi方程描述小x区域的核遮蔽和反遮蔽效应,以改进部分子演化模型,使我们不必引入核遮蔽因子便可统一地描述EMC效应、核遮蔽和反遮蔽效应.最后,利用改进的部分子演化模型相当好地解释了核Drell-Yan过程的实验数据.     

核子中奇异夸克分布不对称性与轻味夸克碎裂效应

核子中奇异－反奇异夸克分布的不对称性是核子结构研究中的重要非微扰效应, 然而至今未被实验所直接检验.为了探讨测量这种奇异分布不对称性的有效方法,考察了轻味夸克碎裂效应对测量奇异分布不对称性的影响.建议通过直接测量高能中微子和反中微子的带电流深度非弹散射中的带电和中性D介子的微分截面来测量奇异分布的不对称性.这种方法能够使奇异分布不对称性与轻味夸克碎裂的效应相分离.     

Gottfried求和规则中的价夸克混合效应

本文讨论了深度非弹过程中的价夸克混合效应.这个效应连同介子云的贡献支配了Gottfried求和规则的破缺.     

原子核内的夸克效应

这篇评述文章说明了下面四个问题:(i)任何色单态夸克反夸克系统的隐色道一定可以用通常的强子道表示出来,因此任何与隐色道有关的物理总可以用通常的强子自由度来解释;(ii)夸克胶子交换和矢量介子交换产生的重子重子自旋轨道耦合力非常相似,因此不能指望用超核的自旋轨道劈裂来区别夸克胶子交换模型和矢量介子交换模型;(iii)对于破坏电荷独立及电荷对称的重子互作用,电磁作用和夸克质量差同样重要,任何电荷相关互作用的计算必须同时考虑电磁作用和夸克质量差;(iV)和QED中的电子脱局域效应相似,我们猜测对QCD可能有夸克脱囚禁效应并且研究了此效应在双重子系统中的表现。     

超新星核中的夸克相变及夸克质量效应

分别基于组夸克质量模型和流夸克质量模型, 讨论了超新星核心区两味夸克物质到更稳定的三味夸克物质的相变过程. 结果表明, 两种质量模型下相变的特征时标都短于10^-8s, 且质量越小的流夸克质量模型的相变速率越快;组分夸克质量模型下所得到的超新星核区的s夸克丰度, 中微子丰度及中微子总能量(除温度)相比前人的结果有轻微的增加, 而流夸克质量模型下所得到的这些参量的增加更为明显, 采用流夸克质量模型更有利于超新星的中微子延迟爆发机理的成功. 关键词： 夸克相变 组分夸克质量 流夸克质量 超新星     

统一描述EMC效应,核Drell-Yan过程和J/ψ光生过程的一个简单模型

通过引入一个用来描述核遮蔽与反遮蔽效应的海夸克和胶子的重组因子,结合x重新标度模型,在保持核动量守恒的条件下,统一描述EMC效应,核Drell-Yan过程和J/ψ光生过程,获得满意的结果.     

小x区核遮蔽效应的研究

本文分析了小x区原子核内邻近核子间海夸克空间重叠行为,给出了核遮蔽因子R(x,Q²,A)与空间重叠程度因子ΔV_A(x)/V_A(x)的关系.并据此计算了¹²C、⁶³Cu和¹¹⁶Sn的平均核结构函数与氘核结构函数之比,计算结果与实验数据符合甚好.     

Energy Loss of Fast Quarks in Nuclear Drell-Yan Dimuon Production

The energy loss effect in nuclear matter, which is another nuclear effect apart from the nuclear effects on the patton distribution as in the deep inelastic scattering process, can be measured best by the nuclear dependence of the high energy nuclear Drell-Yan process. By means of the quark energy loss parametrization given in literature and the nuclear patton distribution extracted only with lepton-nucleus deep inelastic scattering experimental data, measured Drell-Yan production cross sections are analysed for 800-GeV protons incident on a variety of nuclear targets from FNAL E866. The average energy loss of quarks are given by fitting the Fe/Be and W/Be Drell-Yan cross section ratios versus the incident patton momentum fraction.     

On the Nuclear Effects of Valence Quark Distributions and Sea Quark Distributions

In this paper we present a method which may be used to get the nuclear effect functions R_υ^A(x_t) and R_s^A(x_t) for valence quark distributions and sea quark distributions in the light of the data of 1-A deep inelastic scattering and nuclear Drell-Yan process. Both the functions may be used to test the theoretical models explaining the nuclear effects. With nuclei Fe, Ca and C as examples, the results are shown.     

Nuclear Effect Study Under K Factor‘s Nonconstancy

A consistent approach to estimating nuclear effect functions RA RvA (x2) and RSA(x2) based on numerical iteration technique is presented in the quark-parton model when taking into account the nonconstancy of quantum chromodynamics correction factor K. ARv (x2) and RsA(x2) correspond respectively to the valence quark distributions for one bound nucleon within the nucleus and to the sea quark ones. Related numerical analysis is given for nuclei 6 12C,20 40Ca, and 26 56Fe. As the basis, it adopts both experimental data of the high energy proton-nucleus Drell-Yan process and of the high energy lepton-nucleus deep inelastic scattering.     

Nuclear Effect Study Under K Factor's Nonconstancy

A consistent approach to estimating nuclear effect functions R_v^A(x₂) and R_s^A(x₂) based on numerical iteration technique is presented in the quark-parton model when taking into account the nonconstancy of quantum chromodynamics correction factor K. R_v^A(x₂) and R_s^A(x₂) correspond respectively to the valence quark distributions for one bound nucleon within the nucleus and to the sea quark ones. Related numerical analysis is given for nuclei ₆C¹², ₂₀Ca⁴⁰, and ₂₆Fe⁵⁶. As the basis, it adopts both experimental data of the high energy proton-nucleus Drell-Yan process and of the high energy lepton-nucleus deep inelastic scattering.     

改进的部分子演化模型及其对EMC效应和核Drell－Yan过程的解释

用解析方法证明了部分子演化模型可为双重Ｘ重新标度模型提供物理基础，进而利用修正的Ａｌｔｅｒａｌｌｉ－Ｐａｒｉｓｉ方程描述小ｘ区域的核遮蔽和反遮蔽效应，以改进部分子演化模型，使我们不必引入核遮蔽因子便可统一地描述ＥＭＣ效应、核遮蔽和反遮蔽效应．最后，利用改进的部分子演化模型相当好地解释了核Ｄｒｅｌｌ－Ｙａｎ过程的实验数据．     

Nuclear Effect on Nucleon Structure Function in the Extended x-Rescaling Model with Parton Recombination Effect

The extended x-rescaling model is tested by taking into account the parton recombination effect to explain the nuclear effects including the EMC effect, nuclear Drell-Yan ratios and the nuclear gluon distributions in the ⁵⁶Fe nucleus. The calculated results satisfactorily agree with the data of the EMC effect, nuclear Drell-Yan ratio and nuclear gluon distributions.     

电子准弹性散射宇称不守恒中的奇异夸克效应

采用相对论平均场模型，计算了１２Ｃ和４０Ｃａ的准弹性电子散射的字称不守恒不对称性Ａ．研究了核内奇异夸克成份对Ａ的影响。     

QCD非微扰和能量丢失效应对夸克分布影响

在非常数性K因子的情况下,根据核Drell-Yan过程的高能强子h同原子核A碰撞和高能轻子l同原子核A深度非弹性碰撞的实验数据,在考虑QCD非微扰效应对深度非弹性散射部分子分布的影响及Drell-Yan过程中的能量丢失效应,计算确定价夸克分布和海夸克分布核效应函数RAυ(x₂),RAS(x₂)的变化,深化了对原子核内夸克分布受核效应影响的认识     

核Drell–Yan过程中的能量丢失现象

在考虑EMC效应的基础上进一步考虑了入射强子的能量丢失现象,用部分子演化模型预见核Drell-Yan过程,效果明显改进.