高能e+e－→两喷注时的夸克产生律

本文利用e⁺e^－→重夸克jets中, 可分辨电磁激发与强作用产生的夸克的优点, 对后者的产生规律作了研究, 发现它产生的夸克对数满足一种简单普适规律, 由此算出的、i>多重数分布、前后关联等等都和实验符合、本文介绍了与的比较.     

高能e++e－→e++e－+强子过程中的电弱干涉效应

在这篇文章中, 我们用[2]中的结果讨论了与极化光子结构函数相关的电弱干涉效应, 这个效应提供了对G-W-S(格拉肖-温伯格-萨拉姆)模型作进一步检验的可能并且导致对光子结构函数的更深入的了解.     

e+e－湮灭与大横动量P⊥分布

本文从e⁺e^－湮灭的次级粒子的横动量分布的表示式中, 导出了当m_⊥>>T时横质量m_⊥的平均无标度性.     

THE FRAGMENTATION SCHEMES IN e+e－ ANNIHILATION

The comparison of two fragmentation schemes used in the analysis of e⁺e^－ annihilation are presented in this paper.It is found that the independent fragmentation assumption is strongly disfavored by the data of the final particle multiplicities,and the string fragmentation assumption agrees with experiments.     

QCD JET IN POLARIZED e+e－ ANNIHILATION

Following perturbative QCD theory, the two-jet and three-jet angular distributions in polarized e⁺e^－ annihilation is computed using the dimensional regularization scheme. The azimuthal inhomogeneity caused by the polarization is discussed. We also compute the exact formulae of dependence on ε´,δ to the second order and discuss the correction to G.Sterman and S.Weinberg's result.     

ELECTROWEAK INTERFERENCE EFFECTS IN THE HIGH ENERGY e++e－→e++e－+ HADRONS PROCESSES

In this paper we examine the electroweak interference effects related to the polarized photon structure functions making use of the results of the ref.[2]. The effects provide the probability of a further test of the G-W-S model and may lead to a deep understanding to the photon structure functions.     

e+e－湮没过程的多重数分布

本文分析了e⁺e^－ 湮没中多重数的实验分布, 指出可能是夸克数目服从四动量守恒限制下的Poisson分布, 加上组合过程影响的结果. 并利用一种在其他方面取得明显成功的夸克组合律作了计算, 得到与实验符合的结果. 还对轻夸克jet作了单独讨论.     

A Study of the Processes of e+e－→e+e－,μ+μ－ at Large Angle and Measured Luminosities

Using the BES data collected at √S=4.03GeV.the QED processes of e⁺e^－→e⁺e^－,μ⁺μ^－ have been studied. Our measurements agree with the QED prediction,and luminosities obtained from these two final states are compatible at a level of 4%.The total integrated luminosity of 23.1pb^－1 was given for all data collected at this energy region from the calculation.     

Strangeness Suppression in e+e－ Light Flavour Jets

From the simple physical picture of quark combination model, we obtain the generate probabilities of various particles and relative ration in e⁺e^－→q₀q₀→h′s process, and find that the relationship between the ration of strange hadron to unstrange hadron γ and the strangeness suppression factor λ. Our results can be used to explain particle ration enhancement observed in experiments without assumption of strangeness suppression factor enhancement.     

Color Rearrangement in e+e－→W+W－→h's Process

The probability of Color Rearrangement at partonic level in e⁺e^－→W⁺W^－→h,s process is studied using the Color Effective Hamiltonian. The comparison between our results and those of Gutafson and Sjostrand et al. is also given. It is found that this probability cannot be neglected, and it is pointed out that to investigate the Color Rearrangements, the hadronization models should be developped and improved.     

THE COMBINATION RULE OF QUARKS IN e+e－ ANNIHILATION

We show that the near correlation in rapidity is consistent with the requirements of QCD, and completely determines the combination rule of quarks. We give the formulae for calculating yields of mesons, baryons and antibaryons, which are produced by a stochastic accumulation of quarks with similar rapidities. Using it to e⁺e^－ annihilation, the observation of recently unexpected copious production of baryons is explained naturally.     

Energy dependence of non-linear dynamical features in e+e－ collisions

A study of the dynamical fluctuation properties at various c.m. energies in e⁺e^－ collisions is performed using the Monte Carlo method. The results suggest that, after the normalized factorial moments of 3-dimensional phase space are analyzed using an isotropical phase space partition, the NFM describing non-linear dynamical properties show a power-law scaling, i.e., the dynamical fluctuations in higher dimensional phase space are isotropic. For c.m. energies √s≤80 GeV, the scaling exponents φ_q increase rapidly with the c.m. energy and for c.m. energies √s>80GeV, the φ_q gradually saturate.     

A Rigorous Calculation for the Radiator in e+e－ Process

Using the precise expression of electron,positron distribution function we obtained earlier,we derive the rigorous analytical expression of radiator in e⁺e^－ collision process.This series expression converges rapidly to the precise result required.The comparison with existing approximate expression is also given.Our result benefits the precice calculation for the radiative corrections in e⁺e^－ collision processess.     

Fragmentation Character of Resonance Events in BEPC e+e－ Annihilation

In this paper an important character was found that the final hadron multiplicities of direct J/ψ decays satisfy the same universal mass dependence as that in e⁺e^－→q₀q₀ continuum events. This indicates that the fragmentation of quark and gluon to hadron follows the same mechanism. We give a reasonable interpretation to final baryon multiplicity that is enhanced by 2.5 times in direct Y decays compared to the continuum through our calculating results. But we cannot find this similar phenomenon in direct J/ψ decays.     

THE FRAGMENTATION OF GLUON OF GLUON IN e+e－ ANNIHILATION

In this paper,we suggest that the gluon is hadronized by first splitting into a quark-anti-quark pair.The final hadrons are produced by the color interactions among the quarks and antiquarke.By this assumption,the calculated average charged particle multiplicities in e⁺e^－→3jet events,and the ratio of multiplicities between gluon and quark jet,and the rates of baryons in e⁺e^－ three gluons events all agree well with experiments.The angle distribution of final particles can be explained.     

Probability of e+e－ Annihilation in High Energy Collision and Intermittency

Charged particle multiplicity distributions for e⁺e^－ annihilation are shown to be very well described by a negative binomial distribution in high energy collisions.The factorial moments F₂,F₃ and F₄ are given in terms of 3k.     

Production of charmonium(like) states in e+e－ interactions

We present a search for new charmonium like states in e⁺e^－ annihilation using the initial-state radiation and the process e⁺e^－J/ψD^(*)D^(*). The analyses are based on a huge data sample recorded near the Υ(4s) resonance with the Belle detector at the KEKB e⁺e^－ asymmetric-energy collider.     

THE RATIO OF CHARMED BARYON TO MESON IN e+e－ ANNIHILATION

Using the quark production and combination rules in e⁺e^－ annihiation,we have calculated the ratio of charmed baryon to meson in e⁺e^－ annihilation.The pridectied ratio is a function of energy s,and is consistent with the experiments.     

Analytic Approximation for Process e++e－→τ++τ－ Cross Section Near Threshold

In the structure function approach,we calculate the threshold behaviours for e⁺+e^－→τ⁺+τ^－,which including QED radiative corrections from initial correction,vacuum polarization effect,Coulomb effect and final state correction.This theoretical prediction for threshold behaviours of τ-pair production is useful for BES new measurement of lepton τ mass.     

RAPIDITY DISTRIBUTION AND BARYON-ANTIBARYON CORRELATIONS IN e+e－→TWO JET EVENTS

We extend our model by introducing explicitly the energy-momentum of quarks.By using the Monte-Carlo method,the rapidity distribution in light jet events is calculated.Agreement with experiment data is good.The baryon-antibaryon correlations in rapidity,open angle,azimuthal angle are also given,which are in agreement with experiment on the whole.