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AbstractAbstract

[en] A systematic investigation on the world of hadrons is made based on a unified model without the color freedom. Here respective hadrons are described by the Fierz-components of multi-local fields, which play a role of wave functions in the usual approach and, at the same time, are second-quantized by following the usual spin-statistics connection. First in Part I we introduce a new Fock-space concerning a ''urciton'' which might reflect an exciton of some ''extended object'' and is quantized with a Bose-type commutator. Various multi-local fields for both non-exotic and exotic hadrons are organized as Fock-amplitudes of a general vector in this space. Our kinematical framework as a relativistic quark model has a characteristic feature to be called a boosted SU(6) x O(3) scheme, and is applied successfully to phenomenological analyses of various phenomena concerning non-exotic hadrons in Part II. Which is true, our ''white'' Bose quarks or the conventional colored Fermi quarks[ This problem is discussed in Part III, investigating mainly non-leptonic weak interactions and level structures of exotic particles which become very much different in the two approaches, reflecting the difference of supposed quark-statistics. (author)

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Journal Article

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Progress of Theoretical Physics (Kyoto); ISSN 0033-068X; ; (no.67); p. 209-281

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AbstractAbstract

[en] The mechanical models of the bi-local fields and the string models are discussed in the formal point of view. Since the formulation of the extended particle pictures has no unique way, there are various formulations even in the simplest bilocal models. We confine ourselves mainly in the formulations by following which the interactions have been investigated. The scattering amplitudes and the form factors are discussed qualitatively. Some comments on the subsidiary conditions suppressing the relative time freedom are given by following Dirac's formalism. A short discussion of the bi-local model with spin is also shown by introducing Grassmann variables as classical variables corresponding to spin freedom. As to the string model, we have discussed various interesting but unsolved problems; namely, the electromagnetic interactions, the string with massive ends, the spinning string and so on. We have proposed tentative prescriptions for treating some of these problems. We also discuss the different point of view concerning the string model. That is, we show that the difference equation furnishes us the same result as that given by the string model. (author)

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Journal Article

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Progress of Theoretical Physics (Kyoto); ISSN 0033-068X; ; (no.67); p. 69-114

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AbstractAbstract

[en] Fragmentation functions of pions and kaons are studied using the spectator model. We find that by taking account of the multiparticle states in the spectator, the experimental values of the pion and kaon fragmentation functions can be reproduced. We also obtain the relation between the kaon fragmentation functions from the u-quark and the s-quark. (author)

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11 refs., 7 figs.

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Journal Article

Journal

Progress of Theoretical Physics (Kyoto); ISSN 0033-068X; ; v. 104(2); p. 421-428

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BOSONS, COMPOSITE MODELS, ELEMENTARY PARTICLES, FERMIONS, HADRONS, INELASTIC SCATTERING, INTERACTIONS, LEPTON-BARYON INTERACTIONS, LEPTON-HADRON INTERACTIONS, LEPTON-NUCLEON INTERACTIONS, MATHEMATICAL MODELS, MESONS, NUCLEAR REACTIONS, PARTICLE INTERACTIONS, PARTICLE MODELS, PSEUDOSCALAR MESONS, QUARK MODEL, QUARKS, SCATTERING, STRANGE MESONS, STRANGE PARTICLES

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AbstractAbstract

[en] We consider bosonic noncritical strings as QCD strings and we present a basic strategy to construct them in the context of Liouville theory. We show that Dirichlet boundary conditions play important roles in generalized Liouville theory. Specifically, they are used to stabilize the classical configuration of strings and also utilized to treat tachyon condensation in our model. We point out that Dirichlet boundary conditions for the Liouville mode maintains Weyl invariance, if an appropriate condition is satisfied, in the background with a (non-linear) dilaton. (author)

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15 refs.

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Journal Article

Journal

Progress of Theoretical Physics (Kyoto); ISSN 0033-068X; ; v. 104(4); p. 809-826

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AbstractAbstract

[en] We investigate non-perturbative structures of the two-dimensional N=2 supersymmetric nonlinear sigma model on the quadric surface Q

^{N-2}(C)=SO(N)/SO(N-2) x U(1), which is a Hermitian symmetric space, and therefore Kaehler, by using the auxiliary field and large-N methods. This model contains two kinds of non-perturbatively stable vacua; one of them is the same vacuum as that of the supersymmetric CP^{N-1}model, and the other is a new kind of vacuum, which has not yet been known to exist in two-dimensional nonlinear sigma models, the Higgs phase. We show that both of these vacua are asymptotically free. Although symmetries are broken in these vacua, there appear no massless Nambu-Goldstone bosons, in agreement with Coleman's theorem, due to the existence of two different mechanisms in these vacua, the Schwinger and the Higgs mechanisms. (author)Primary Subject

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22 refs., 2 figs., 7 tabs.

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Journal Article

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Progress of Theoretical Physics (Kyoto); ISSN 0033-068X; ; v. 105(2); p. 261-285

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AbstractAbstract

[en] A method to obtain microscopic descriptions of Λ hypernuclei is formulated in the framework of the unitary-model-operator approach. A unitarily transformed Hamiltonian is introduced and given in a cluster expansion form. The structure of three-body cluster terms are discussed, in particular, with regard to the Λ single-particle energy. The Λ single-particle energies including the three-body cluster contributions are calculated for the 0s

_{1/2}, 0p_{3/2}and 0p_{1/2}states in_{Λ}^{17}O, and for the 0s_{1/2}, 0p_{3/2}, 0p_{1/2}, 0d_{5/2}, 0d_{3/2}and 1s_{1/2}states in_{Λ}^{41}Ca, using the Nijmegen soft-core (NSC), NSC97a-f, and the Juelich A tilde (JA tilde) and JB tilde hyperon-nucleon interactions. It is found that the three-body cluster terms bring about sizable effects in the magnitudes of the Λ single-particle energies, but affect the Λ spin-orbit splittings only little. (author)Primary Subject

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30 refs., 7 figs.

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Journal Article

Journal

Progress of Theoretical Physics (Kyoto); ISSN 0033-068X; ; v. 104(1); p. 123-141

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ALKALINE EARTH ISOTOPES, BARYON-BARYON INTERACTIONS, BARYONS, BETA DECAY RADIOISOTOPES, CALCIUM ISOTOPES, COUPLING, ELECTRON CAPTURE RADIOISOTOPES, ELEMENTARY PARTICLES, EVEN-ODD NUCLEI, FERMIONS, HADRON-HADRON INTERACTIONS, HADRONS, HYPERONS, INTERACTIONS, INTERMEDIATE COUPLING, INTERMEDIATE MASS NUCLEI, ISOTOPES, LAMBDA BARYONS, LIGHT NUCLEI, MANY-BODY PROBLEM, MATHEMATICAL MODELS, NUCLEAR FRAGMENTS, NUCLEAR MODELS, NUCLEI, OXYGEN ISOTOPES, PARTICLE INTERACTIONS, RADIOISOTOPES, SERIES EXPANSION, STABLE ISOTOPES, STRANGE PARTICLES, YEARS LIVING RADIOISOTOPES

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AbstractAbstract

[en] Polarization correlation coefficients have been measured at RIKEN for the

^{3}H vector e(d vector, p)^{4}He reaction at intermediate energies (E_{d}= 270 MeV). We propose a model for the (d vector, p) reaction mechanism using the pd elastic scattering amplitude, which is rigorously determined with a Faddeev calculation and using modern NN forces. Our theoretical predictions for the deuteron polarization observables A_{y}, A_{yy}, A_{xx}and A_{xz}at E_{d}= 140, 200 and 270 MeV are given. The A_{y}observables agree qualitatively in shape with the new experimental data for the reaction^{3}He(d vector, p)^{4}He. (author)Primary Subject

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9 refs., 9 figs.

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Journal Article

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Progress of Theoretical Physics (Kyoto); ISSN 0033-068X; ; v. 104(3); p. 703-708

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AbstractAbstract

[en] The su(2)-algebraic model interacting with an environment is investigated from the view-point of treating a dissipative system. By using a time-dependent variational approach with a coherent state and with the help of the canonicity condition, the time-evolution of this quantum many-body system is described in terms of the canonical equations of motion in the classical mechanics. Then, it is shown that the su(1,1)-algebra plays an essential role in treating this model. An exact solution with appropriate initial conditions is obtained in terms of Jacobi's elliptic function. The implications for the dissipative process are discussed. (author)

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10 refs.

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Journal Article

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Progress of Theoretical Physics (Kyoto); ISSN 0033-068X; ; v. 105(5); p. 717-728

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AbstractAbstract

[en] We assume the universal Yukawa coupling (democratic mass matrix) with small violations for quarks, charged leptons and neutrinos masses. From this assumption, we were able to reproduce the observed mass hierarchy for quark masses and V

_{CKM}matrix elements precisely. We introduce right-handed Majorana neutrinos and Dirac neutrinos and adopt the seesaw mechanism for the explanation of the smallness of neutrino masses. We assume the universal Yukawa coupling with small violations for Majorana and Dirac neutrinos. We are able to obtain the hierarchy of charged lepton masses and effective neutrino masses and the large mixing of neutrinos expressed in V_{NMS}. (author)Primary Subject

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12 refs., 1 fig.

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Journal Article

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Progress of Theoretical Physics (Kyoto); ISSN 0033-068X; ; v. 105(5); p. 763-772

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AbstractAbstract

[en] Preheating after inflation, which can be interpreted as particle creation in an oscillating inflation background, represents a state far from thermal equilibrium. We extend the field theoretical treatment of the preheating by Linde et al. to the case of multicomponent complex scalars to show that charges are created in this process if C and CP are violated. A new possibility for baryogenesis based on this mechanism is also discussed. (author)

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5 refs., 3 figs., 2 tabs.

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Journal Article

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Progress of Theoretical Physics (Kyoto); ISSN 0033-068X; ; v. 105(5); p. 773-788

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