1984年, 第3卷, 第2期　
刊出日期：1984-03-30

  

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  SYMMETRY AND WARD IDENTITIES FOR DISORDERED ELECTRON SYSTEMS

  林建成, 沈宇, 周光召

  理论物理通讯. 1984, 3(2): 139-148.

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  We study the field theory approach to Anderson localization in the framework of closed time path Green's function (CTPGF).The theory is found to be invariant under an Sp(2) group. Ward identities related to this symmetry are derived. A non-linear σ model arises as a consequence of the dynamical symmetry breaking caused by the imaginary part of the retarded Green's function.
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  NUMERICAL STUDIES OF THE IRREVERSIBILITY AND THE ANISOTROPY FIELDS IN A DM SPIN GLASS

  姚凯伦

  理论物理通讯. 1984, 3(2): 149-153.

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  The numerical simulation of the irreversiblity of magnetization and the anisotropy field is studied in a spin glass with RXKY and DM interactions, It is found that the anisotropy field increases linearly with the concentration of nonmagnetic impurities, but the remanent magnetization and the saturation remain unchanged with different concentrations. A comparison is made with experiment.
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  q-qCHAIN IS THE BASIC ELEMEIT OF MULTIPRODUCTIONS IN P-P, 1-P AND e⁺e^- COLLISIONS

  赵维勤

  理论物理通讯. 1984, 3(2): 155-164.

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  A unified description is proposed of multiproductions in p-p, l-p and e⁺e^- collisions combining the microscopic language of the dual model with the trick of subtracting leading particles. By using multiproduction data in e⁺e^- collisions as input the mean multiplicities in p-p and l-p collisions are obtained and the multiplicity density at zero rapidity for p-p collisions is discussed.
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  STATISTICAL THEORIES OF PREEQUILIBRIUM NUCLEAR REACTIONS AND THE HAUSER-FESHBACH FORMULA

  唐学田, 陆中道, 王书暖

  理论物理通讯. 1984, 3(2): 165-173.

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  It has been proved that the contribution to the fluctuation cross sections from the equilibrium stage in all.the microscopic theories and models and phenomenological approaches advanced so far of precompound reactions is given by the conventional Hauser-Feshbach formula, and that the Hauser-Feshbach cross section constitutes the leading part of the total cross sections. This conclusion is intuitive, and our proof, unlike the numerical illustration as some people do in this regard, is complete1y a theoretical one.
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  DOES THE CREATION OPERATOR α⁺ POSSESS EIGNVECTORS?

  范洪义, 刘祖伟, 阮图南

  理论物理通讯. 1984, 3(2): 175-188.

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  It is pointed out that the assertion that the eigenfunction of the creation operator a⁺ is identically zero is not rigorous.On the contrary, the eigenfunction of a⁺ may be discussed by using the contour integral representation of δ function, the property of which and the relation with the eigenstate of the annihilation operator are discussed. Its applications, especially the application in thoroughly studying the inverse operator's properties, are presented. It is shown that the phase operator can also be represented by the inverse operator.
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  THE DUAL ABSORPTIVE MODE AND ^πP ELASTIC SCATTERING REVISITED

  Mujahid Kamran

  理论物理通讯. 1984, 3(2): 189-202.

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  Using the Regge pole phase rule for contrilbutions to both amplitudes the DAM is applied to ^πp elastic scattering in the p_lab≥10 GeV/c and |t|≤0.8(GeV/c)² region. It is found that the DAM has a mixed success in describing ^πp scattering. The p contribution to both amplitudes is in accord with the DAM while the f-non-flip contribution does not have a peripheral zero.The Pomeron imaginary part is in accord with the DAM with a non-negligible Pomeron phase so that the DAM approximation Rep=O is unsatisfactory. There is also a Pomeron-flip contribution contrary to the expectation of the model. The O-flip contribution is taken into account and a small f-flip contribution i s also required.
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  RADIATIVE DECAY J/ψ→γη^′ IN PERTURBATIVE QCD

  黄朝商, 赵志泳

  理论物理通讯. 1984, 3(2): 203-210.

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  The deccy rate of J/ψ→γη^′ is calculated by using the light-cone wave function of the flavor singlet pseudoscalar. The result is reasonably in agreement with the experiment.
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  THE CONVERSION OF GLUONS INTO QUARKS AND THE MULTIQUARK STATES

  赵光达

  理论物理通讯. 1984, 3(2): 211-220.

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  The rate for the conversion of the gluon into a color octet quark pair which subsequently forms a multiquark state with another quark pair or a gluon is discussed. The static potential in a [(QQ)₈(qq)_8,1] state where Q=c,b and q=u, d is studied in the MIT bag model. It is shown that the repulsive Coulomb force between Q and Q is dominant at small QQ separations, which would significantly suppress the QQ wave function at the origin. For the charm quark (Q=c) the ratio of |Ψ(O)|² for the ordinary (QQ)₁ to that for the(QQ)₈ in the [(QQ)₈(qq)_8,1] state is estinated to be 2-5. Therefore the assumption |Ψ₈(O)|²=|Ψ₁(O)|² would lead to an overestimation for the rate of g*→QQ and it is necessary to take the suppression effect of the repulsive Coulomb force into consideration.
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  ON THE DYNAMICAL SYMMETRY BREAKING FOR THE N=l PURE SUPERSYMMETRIC YANG-MILLS MODEL

  周光召, 戴元本, 张肇西

  理论物理通讯. 1984, 3(2): 221-229.

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  An approximate effective Lagrangian of composite operators in superfield formalism for the N=l pure supersymmetric Yang-Mills model is obtained with the help of renormalization group equations for the generating functional. While the supersymmetry is always kept unbroken by this effective Lagrangian we find that the chiral symmetry may and may not be unbroken.
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  SELF-ENERGY IN THE BAG MODEL

  杨新华, A. K. Kerman

  理论物理通讯. 1984, 3(2): 231-244.

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  Based on the many-body theory of confined quarks and gluons^[l], the ultraviolet divergence of the self energy in the bag model is discussed. It is shown that for massless quark the self energy is finite and it is 1ogarithmically divergent for massive quark. The numerical calculation is performed for m=0 and m=1.0(in unit 1/R). The self energy has important effects on the bag model and changes the parameters in this model considerably. Furtherstudy of selfenergy and mass renormalization is necessary.
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  ON THE DYPNAMICAL PROBLEM WITHIN SUECONSTITUENT STRUCTURE

  黄涛, 谢诒成

  理论物理通讯. 1984, 3(2): 245-250.

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  We present an analysis on the dynamical problem within a composite model, in which leptons, quarks and W-bosons are composed of the heavier preons.
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  AN IMPROVED EFFECTIVE POTENTIAL APPROACH TO DYNAMICAL SYMMETRY BREAKING

  邝宇平, 李小源, 赵志泳

  理论物理通讯. 1984, 3(2): 251-256.

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  We have developed, in this paper, a method for evaluating effective potential for local composite fields based on loop expansion by first renormalizing the generating functional of connected Green's functions and then making the Leqendre transformation. A consistency condition reflecting the fact that no condensate effect occurs at tree level is proposed, which plays an important role in this method. The method is illustrated through the Gross-Neveu model. This method can be applied to a wider class of models than can the auxiliary field method.
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  ANALYSIS OF SOME HYPERCHARGE EXCHANGE REACTIONS OF THE TYPE 0^-+1⁺/2→2⁺+1⁺/2 at 4 GeV/c

  Mohammad Saleem, Muhanunad Ali

  理论物理通讯. 1984, 3(2): 257-261.

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  The differential and integrated cross section data for the hypercharge exchange reactions ^πp→K°(1420)Λ, K ^- p→f°Λ and K ^- p→f^′Λ at 4 GeV/c are fitted by using as imple Regge pole model with phenorncnological residue functions. It is assumed that each of the two non-degenerate K^* and K^** trajectories, exchanged in this reaction, is coupled only to one of the two independent helicity amplitudes.
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  DOES PARISI'S SOLUTION OF THE SHERRINGTON-KIRKPATRICK MODEL LOCATE ON THE ABSOLUTEMAXIMUM OF THE FREE ENERGY?

  沈宇, 周光召

  理论物理通讯. 1984, 3(2): 263-267.

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  In the spin glass phase near the critical temperature we find in aparticular replica symmetry breaking pattern an order parameter with free energy greater than that of the Parisi's.