Relativistic Center-of-Mass Vector and Electric Polarizability of a Charged Pion Meson

Comparing the relativistic and nonrelativistic frame works, we study the effect of the relativistic center-of-mass vector on the electric polarizability of a compound system.     

Study of Electric Polarizabilities of Nucleon with a Constituent Quark Model and Pion Meson Cloud

In this work, a subtle role of the pion meson cloud effect on the electric polarizabilities of the proton and neutron is stressed. It is shown that the electric polarizabilities of the proton and neutron, and the difference between the electric polarizabilities of the proton and neutron can be explained by including the pion meson cloud explicitly. However, the magnitude of the estimated mean-square charge radius of the neutron is still far from the measurement.     

Relativistic Correction on Neutrino Emission from Neutron Stars in Various Parameter Sets

In the relativistic mean field theory and cooling theories, relativistic correction on neutrino emission from neutron stars in four typical nuclear parameter sets, GM1, GL85, GPS250 and GPS300 is studied. Results show that relativistic effect makes the neutrino emissivity, neutrino luminosity and cooling rate lower, compared with the non-relativistic case. And the influence of relativistic effect grows with the mass of the neutron star. GPS300 set leads to the biggest fall in neutrino emissivity, whereas GM1 set leads to the largest disparity in cooling rate caused by relativistic effect.     

介子束缚态相对论本征方程的非微扰重整化

介子结合态本征方程中δ相互作用可用T矩阵进行非微扰重整化,深入理解重整化的一些基本问题:物理结果与重正化点的选取无关,T矩阵非微扰重整化的物理实质. Nonperturbative T-matrix renormalization of the relativistic eigen equation for meson mass spectra is described and the expressions for eigen mass spectra and eigen wave functions are given.     

关于K-p两体问题的相对论修正

从基本理论出发，导出并求解了含有相对论修正的K^-介子与质子的两体薛定谔方程。其解可看作有统计解释的波函数。计算了K^p的散射长度，结果表明相对论效应是很明显的。A two-body equation of the kaon-proton system with relativistic correction is derived and solved. The solution can be considered as a wave function with the probability interpretation. The scattering lengths are calculated, and the numerical result shows that the relativistic effect is apparent.     

相对论重离子碰撞中π对相对动量分布

在π源动量分布的高斯分布下,给出了相对论重离子碰撞中非关联π对和关联π对的相对动量分布.用关联π对的相对动量分布得到球形高斯分布π源参数与椭球形高斯分布π源参数的解析关系,与相对论重离子中心碰撞1.8A GeV Ar+Pb的实验结果进行了对比.当π源温度更高时,应当用p₁(p)=N·exp(–m2+p2/T)进行计算.     

Photoproduction of Light Vector Meson in Relativistic Heavy Ion Collisions

We calculate the hard photoproduction of light vector meson from the fragmentation of photon in Pb Pb col- lisions. Using the perturbative quantum chromodynamics calculation, we rigorously derive the electromagnetic fragmentation production for p, co and Ф in relativistic nucleus-nucleus collisions by the photoproduction pro- cesses. It is shown that the differential cross section of photoproduction processes of light vector meson cannot be negligible in relativistic heavy ion collisions at Large Hadron Collider energies.     

相对论效应对有限温下重夸克偶素的性质的影响

考虑相对论修正对重夸克偶素结合和分解所产生的作用，计算了重夸克偶素在热力学环境中的临界性质，并与非相对论模型理论进行了比较．     

自旋相关相对论修正对重夸克偶素性质的研究

自旋相关的相对论修正对有限温度下重夸克偶素的结合和分解的影响进行了讨论,结果表明精细和超精细相互作用特影响对重夸克偶素性质的预言,特别是对ηc和J/ψ起着明显的作用.     

探测中性TC矢量介子的可能性

构造了与中性矢量介子有关的最低阶相互作用算符.用这些算符计算了新的一代TC(Technicolor)模型的最轻的中性矢量介子ρ⁰的各种可能衰变宽度、分支比,并讨论了在pp碰撞或LEPⅡ上观测此种粒子的可能性.     

Meson Cloud Effect on △(1232) Resonance Transition Properties with a Relativistic Quark Model Approach

Based on a relativistic quark model approach, the transition properties of the first nucleon resonance △(1232), and the coupling constants gπNN, g△πN are investigated. Tvo different vays to remove the center of mass motion are considered. The results of the relativistic approaches with and without center ofmass correction are compared with those of nonrelativistic constituent quark model. Moreover, pion meson cloud effect on these calculated observables is explicitly addressed. Better results are obtained by taking the pion meson cloud into account.     

Analysis of Vector Meson Transitions Among Heavy Quarkonium States

In this article,we study the vector meson transitions among the charmonium and bottomonium states with the heavy quark effective theory in a systematic way,and make predictions for the ratios among the vector meson decay widths of a special multiplet to another multiplet.The predictions can be confronted with the experimental data in the future.     

The First Principle Formula of the Relativistic Heat Conductivity of Coulomb Electronic Plasmas

Making use of the relativistic BBGKY technique,the relativistic generalization of Landau collision integral is botained.Furthermore,we calculate the relativistic hydrodynamic modes up to the second order in the hydrodynamic wave number.Combining Resibois‘ method,we present the first principle formula of the relativistic heat conductivity of Coulumb electronic plasmas for low-order corrections.     

类碳体系基态能量的相对论修正(英文)

以Breit-Pauli哈密顿的球张量形式为基础,借助不可约张量理论,将多电子原子能量的相对论修正理论拓展到了原子的拉卡波函数为多个Slater基函数的线性组合的情形,导出了此情形下多电子原子能量相对论修正(包括相对论质量修正项、单体和双体迭尔文修正项、自旋-自旋接触相互作用项)的解析表达式,完成了所有角向积分和自旋求和计算.利用所建立的理论,对类碳体系基态能量的相对论修正进行了具体计算.     

类铝离子基态能量的相对论修正和Z相关修正

以Breit-Pauli哈密顿的球张量形式为基础,借助不可约张量理论,在拉卡表象下计算了类铝体系基态能量相对论修正(包括相对论质量修正项、单体和双体达尔文修正项、自旋-自旋接触和轨道-轨道相互作用项)。在此基础上,引入了一个与核电荷数Z相关的能量修正项,用以弥补因忽略能量的其它高阶项对原子体系能量的影响。计算结果与实验值非常接近。     

Photoproduction of Vector Meson ø off Deuteron in QCD Inspired Model

Based on the quark-gluon contents of nucleon and strongly believing that the force mediators, Pomeron and its counterpart in the conventional approach of Regge theory, for high energy diffractive process would be the tensor glueball and Odderonrespectively, we discuss photo-production of vector meson ø off the deuteron at energy less than 3 GeV in the QCD inspired model in which the quark gluon degrees of freedom and glueball, Odderon exchange are taken into account. A calculation isperformed for γ+D → ø+D, and the theoretical predictions of the differential cross section dσ ^γD/dt, are presented and compared with available experimental data. Our QCD inspired model reproduces data quite well in the whole range of the experimental measurements up to |t|≌ 0.4~GeV. Our results can be used toextract γn →øn data, which cannot be measured in experiment.     

Electric and Magnetic Form Factors of Proton in Relativistic Constituent Quark Model

Based on relativistic constituent quark (RCQ) model, the electric and magnetic form factors are analyzed. The ratio of the two form factors for the proton $G_{E_p}/G_{M_p}$, which is an image of its charge and magnetization distributions, is calculated in the light-front formulism of RCQ model. Recently, this ratio was measured at the Thomas Jefferson National Accelerator Facility (JLab) using the polarization technique. The new data presented span the range 3.5 GeV²<Q²<5.6 GeV² and are well described by a linear Q² fit. Also, the ratio $\sqrt{Q^{2}}F_{2p}/k_{p}F_{1p}$ reaches a constant value while Q² becomes larger than 2 (GeV)². Our calculation results are presented and appear to be consistent with the experimental ones.     

相对论重离子碰撞中集合流对2π干涉学分析的影响

用小相对动量区域2π干涉学分析方法研究了相对论重离子碰撞中集合流对2π干涉学分析的影响,给出了π源的表观半径与其真实半径的解析关系.     

一种基于支持向量机回归的旋转遮光带日射表散射辐照度修正新算法

通过比较旋转遮光带日射表(RSP)和参考标准表所测散射辐照度之间的数值差异,分析了太阳总辐照度、环境温度、相对湿度和太阳光谱等气象要素对RSP散射辐照度测量误差的影响关系,提出了一种修正RSP散射辐照度测量值的新算法。该算法从支持向量机回归预测角度,建立了对RSP散射误差修正值的一次预测模型,然后根据误差修正值最优预测模型推导出RSP散射辐照度修正算法模型。利用该算法对美国国家太阳辐射研究实验室和劳里观测站采集的RSP散射辐照度数据进行修正,修正后两观测站数据的平均偏差和均方根误差分别降低到-0.2W/m2,3.3W/m2和1.9W/m2,8.5W/m2,显示算法具有良好的修正性能和适用性。该算法能够有效避免Vignola算法中存在的欠修正和Vignola and Augustyn(VA)算法中存在的过修正现象。