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Article type: Cover
1997 Volume 95 Issue 4 Pages
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Article type: Appendix
1997 Volume 95 Issue 4 Pages
App1-
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Article type: Appendix
1997 Volume 95 Issue 4 Pages
D1-D5
Published: July 20, 1997
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Kazuhiro TANAKA
Article type: Article
1997 Volume 95 Issue 4 Pages
D6-D16
Published: July 20, 1997
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We review the spin-dependent structure functions of the nucleon. From a view point of factorization theorem in QCD, we present systematic treatment of the various parton distribution functions, and discuss their physical relevance. Explicit definitions of relevant twist-2 and twist-3 parton distribiitions are given as nucleon matrix elements of nonlocal light-cone operators, and their renormalization and the Q^2-evolution are briefly mentioned. Unique features of the transversity distribution h_1 and of the "measurable" higher-twist distributions h_L and g_T are emphasized. Based on these developments, we discuss prospects of future experiments which will give us opportunities to obtain new information of quark-gluon structure of the nucleon.
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Yuji Koike
Article type: Article
1997 Volume 95 Issue 4 Pages
D17-D21
Published: July 20, 1997
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We prove that the Q^2 evolution of the chiral-odd twist-3 distributions h_L(x,Q^2) and e(x,Q^2) is described by simple GLAP equations in the large N_C QCD as in the case of the chiral-even twist-3 distribution g_2(x,Q^2). In the N_C → ∞ limit, the lowest eigenvalues of the anomalous dimension matrices for the twist-3 operators take very simple analytic forms and they govern the whole Q^2-evolution of these twist-3 distributions.
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J. Kodaira, T. Nasuno, H. Tochimura, K. Tanaka, Y. Yasui
Article type: Article
1997 Volume 95 Issue 4 Pages
D22-D26
Published: July 20, 1997
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We investigate the renonnalization of the twist-3 operators which are relevant to the nucleon's transeverse spin-dependent structure function g_2(x,Q^2). We give a complete set of the twist-3 operators for the flavor singlet part based on the operator product expansion. We derive the anomalous dimension matrix by computing the off-shell Green's functions including the twist-3 singlet operators. As an application, we give an example of the Q^2-evolution for the lowest moment case, and discuss its experimental implication.
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Susumu Koretune
Article type: Article
1997 Volume 95 Issue 4 Pages
D27-D30
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Kazuhisa Tanikawa, Sakae Saito
Article type: Article
1997 Volume 95 Issue 4 Pages
D31-D34
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We calculate the unpolarized and polarized nucleon structure functions F_1(X) and g_1(x), respectively, in the SU(2) chiral quark soliton model at the leading order in the angularvelocity expansion. We take into account the vacuum polarization as well as the valence quark contributions. With a realistic value of the constituent quark mass of M = 400 MeV, the x-dependence of F_1(x) is shown to be in agreement with that of the quark parton model. We observe that the vacuum polarization contribution represents essentially a behavior similar to that of the valence quarks, when the valence quarks dive into the negative-energy states at large M.
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C.S. Kim
Article type: Article
1997 Volume 95 Issue 4 Pages
D35-D40
Published: July 20, 1997
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Recent CDF data of the inclusive jet cross section shows anomalous deviation around large transverse momentum p_T(j) ≈ 200 〜 350 GeV. Is it possible to interpret the anomaly in terms of virtual SUSY effects. The answer is 'NO', because we find that the virtual SUSY loop interference effects are too small to explain the CDF data.
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Akihisa KOHAMA, Koichi YAZAKI, Ryoichi SEKI
Article type: Article
1997 Volume 95 Issue 4 Pages
D41-D46
Published: July 20, 1997
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We calculate cross sections of the high energy electron inclusive scattering off nuclear matter. The formulation is based on the Glauber approximation, which was previously used for the nuclear transparency in (e, e'p) reactions. We emphasize the roles of the final-state interactions and the nuclear short-range correlations.
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SU HOUNG LEE
Article type: Article
1997 Volume 95 Issue 4 Pages
D47-D56
Published: July 20, 1997
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After a brief introduction to QCD sum rules, I review recent developments to extract vector meson dispersion relation in nuclear medium using QCD sum rules. In nuclear medium, the vector meson dispersion relation will be modified to ω^2-(1+α)q^2-m^^2__v=0 to leading order in the vector meson three momentum q relative to the medium. From previous QCD sum rules at zero q, we find decreasing vector meson mass m_V in nuclear medium. From recent QCD sum rules at finite q, we find α 〜 -0.08 for the transverse direction and α 〜 0.06 for the longitudinal direction at nuclear matter density. Both result are relevant for the interpretation of dilepton data from the on going Relativistic Heavy Ion Collisions experiments and planned vector meson production experiments inside heavy nucleus.
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D. Jido, M. Oka
Article type: Article
1997 Volume 95 Issue 4 Pages
D57-D60
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A technique to treat baryons with negative parity in the QCD sum rule is proposed. The masses of the flavor octet and singlet baryons with J^P = 1/2^- are calculated. We find that the value of the quark condensate determines the scale of the mass splitting of the positive and negative parity baryons. The present sum rule reproduces the observed masses of these baryons within 10%, and predicts the mass of the excited H baryon with J^P = 1/2^- at 1.63 GeV. We confirm that the negative-parity state is ground state in the flavor singlet baryon spectrum.
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Hungchong Kim, Su Houng Lee
Article type: Article
1997 Volume 95 Issue 4 Pages
D61-D64
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We propose a new interpolating field for S_<11>(1535) to determine its mass from QCD sum rules. In the nonrelativistic limit, this interpolating field dominantly reduces to two quarks in the s-wave state and one quark in the p-wave state. Using this interpolating field and applying the conventional QCD sum rule analysis, we find that the mass of S_<11> is reasonably close to the experimentally known value, even though the precise determination depends on the poorly known quark-gluon condensate. The sum rule for Λ(1405) is also discussed in this approach.
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Tetsuo NISHIKAWA, Sakae SAITO, Yoshihiko KONDO
Article type: Article
1997 Volume 95 Issue 4 Pages
D65-D68
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We investigate the electromagnetic polarizabilities of the nucleon using the method of QCD sum rules. The diagrams in the operator product expansion are taken into account up to dimension 6. We find that the polarizabilities of the nucleon can be expressed by means of three new kinds of susceptibilities of quark condensates, which represent the response of the vacuum under weak external electromagnetic fields. Estimating the susceptibilities with the method of QCD sum rules itself based on the formalism by Balitsky et al., we see that a good agreement with experiment is given for the neutron electric polarizability.
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A. Hosaka, D. Jido, M. Oka
Article type: Article
1997 Volume 95 Issue 4 Pages
D69-D74
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The πNN^* and ηNN^* coupling constants are studied in the QCD sum rule (N^*≡N(1535)). We investigate the two point functions between the vacuum and a one meson state in the soft meson limit. The operator product expansion is explicitly performed up to terms of dimension eight. We find that g_<πNN^*> vanishes to this order, while g_<ηNN^*> has a finite contribution. The vanishing of g_<πNN^*> is a rigorous consequence in the chiral limit. The results of the QCD sum rule are compared with those of low energy effective models.
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Boris Krippa
Article type: Article
1997 Volume 95 Issue 4 Pages
D75-D81
Published: July 20, 1997
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Yoshinori NISHINO, Kazuhiro TANAKA
Article type: Article
1997 Volume 95 Issue 4 Pages
D82-D86
Published: July 20, 1997
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We calculate the strangeness content of the proton (p|s^^-s|p) by the QCD sum rule method. We take into account the direct (small-scale) instantons, which are shown to play leading roles for (p|s^^-s|p). The direct instantons give rise to the contribution where the source current s^^-s couples to the proton through the fermion zero mode. We also find the novel nonperturbative contribution due to the modification of the instanton density under the external s^^-s source. We show that these contributions could lead to" the results consistent with phenomenological value.
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Seungho Choe
Article type: Article
1997 Volume 95 Issue 4 Pages
D87-D92
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There have been arguments about hadronic molecules, which are weakly-bound states of two or more hadrons. We investigate the possibility of some candidates (f_0(980), α_0(980), f_0(1500), f_0(1710), etc.) using QCD sum rule approach and compare our results with multiquark states in the MIT bag model. We find that f_0(1500), f_0(1710) can be good candidates for vector-vector molecule-type multiquark states.
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Koji Harada
Article type: Article
1997 Volume 95 Issue 4 Pages
D93-D100
Published: July 20, 1997
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We first point out the trouble in the Tamm-Dancoff truncation and identify the source of the trouble as the interactions which change the particle number of a state. We propose a new approach in which such interactions are perturbatively eliminated by a similarity transformation. The simplest model is considered for the purpose of illustration.
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Takanori Sugihara, Masa-aki Taniguchi, Masanobu Yahiro
Article type: Article
1997 Volume 95 Issue 4 Pages
D101-D104
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Mass spectra of the two-dimensional λφ^4 model is calculated with DLFQ (Discretized Light-Front Quantization) technique. A critical coupling is also determined nonperturbatively.
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Pyungwon Ko
Article type: Article
1997 Volume 95 Issue 4 Pages
D105-D108
Published: July 20, 1997
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I review recent developments in theoretical understandings of J/ψ productions in various processes such as pp^^- → J/ψ + X and B → J/ψ + X, including the color-octet ^3S_1 contribution.
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George Wei-Shu Hou
Article type: Article
1997 Volume 95 Issue 4 Pages
D109-D112
Published: July 20, 1997
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We argue that the 1~~ glueball 0 is much cleaner than other glueballs candidates. Anomalously large J/ψ → pπ, K^* K^^- decays and the scalar glueball mass scale suggest that m_o ≃ m_<J/ψ>.
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Masayuki Asakawa
Article type: Article
1997 Volume 95 Issue 4 Pages
D113-D118
Published: July 20, 1997
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As long as a rapid change of the entropy density s(T) takes place across the critical temperature T_C of the QCD phase transition, the pressure P(T) and the energy density e(T) normalized by their Stefan-Boltzmann values generally deviate from unity for T ≫ T_C even if there are no interactions among quarks and gluons at T > T_C. We shall demonstrate this both analytically and numerically for a general class of s(T) consistent with thermodynamical constraints and make a qualitative comparison of the result with the lattice QCD data. Quantities related to ds(T)/dT such as the specific heat and sound velocity are also discussed.
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Fujio Takagi
Article type: Article
1997 Volume 95 Issue 4 Pages
D119-D122
Published: July 20, 1997
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Mean hadron multiplicities in central nucleus-nucleus collisions at RHIC and LHC regions are estimated using the collective quark tube model and the wounded nucleon model for a non-thermal scenario. The same quantities in a hot quark-gluon plasma(QGP) scenario and a hot pion gas scenario are estimated using the maximum entropy method with the Bjorken's scaling hydrodynamics cut in the rapidity space to take into account the energy conservation. Comparison between the results of the four cases indicates that the usefulness of hadron multiplicities as a QGP signal depends on the initial time or the initial temperature when the thermal equilibrium is established in the thermal scenarios.
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A.I. TITOV, B. KAMPFER, T.I. GULAMOV
Article type: Article
1997 Volume 95 Issue 4 Pages
D123-D128
Published: July 20, 1997
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The relation between the anisotropy and asymmetry of the dielectron emission rate is discussed. These observables have been suggested recently as a tool to disentangle different dielectron sources and to study in-medium modifications of the p meson self-energy.
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Hyun Kyu Lee
Article type: Article
1997 Volume 95 Issue 4 Pages
D129-D134
Published: July 20, 1997
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We present the discussions on the hadron properties in the dense medium using the dilated chiral quark model which incorporates the QCD scale anomaly in the effective Lagrangian. Assuming that the dilaton limit is applicable at some short length scale, we interpret the results to represent the behavior of hadrons in dense and hot matter. We obtain the scaling law, (fπ(T))/(fπ)=(m_Q(T))/(m_Q)≃(m_σ(T))/(m_σ). It is also suggested that the hadron masses and the pion decay constant drop faster with temperature than in the conventional linear sigma model. We attribute the difference in scaling in heat bath to the effect of baryonic medium on thermal properties of the hadrons. Starting from the dilated chiral quark model defined in free space, we calculate the density dependent masses. We found that in the large N_C limit (and large scalar mass limit), the tadpoles dominate and hence the mean-field approximation is reliable, giving rise to a Lorentz-invariant Lagrangian. This is consistent with the tendency toward the dilatonic limit at large density.
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Ulf-G. MeiBner
Article type: Article
1997 Volume 95 Issue 4 Pages
D135-D147
Published: July 20, 1997
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I review recent results in baryon chiral perturbation theory, in particular related to pionnucleon scattering and first systematic attempts to go beyond next-to-leading order in the case of three flavors. New insight into the chiral expansion of the baryon masses and magnetic moments is presented.
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Muneyuki Ishida
Article type: Article
1997 Volume 95 Issue 4 Pages
D148-D152
Published: July 20, 1997
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M. Takizawa, M. Oka
Article type: Article
1997 Volume 95 Issue 4 Pages
D153-D157
Published: July 20, 1997
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The η-η' mixing angle is reanalyzed. The theoretical uncertainty is not small enough to give a definite value of the η-η' mixing angle.
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Noriyoshi ISHII, Hiroyasu ASAMI, Wolfgang BENTZ, Koichi YAZAKI
Article type: Article
1997 Volume 95 Issue 4 Pages
D158-D163
Published: July 20, 1997
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The relativistic Faddeev equation in the NJL model is solved numerically in the ladder approximation for the nucleon and the delta states. The baryon masses and the electro-weak properties of the nucleon, i.e., g^<(0)>_A, g^<(3)>_A, the magnetic moments, and the charge radii, are studied. The effects of meson exchange interactions between quarks in the Faddeev approach are analyzed perturbatively, and an improved perturbation theory is proposed in order to include the higher order effects.
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M. Wakamatsu
Article type: Article
1997 Volume 95 Issue 4 Pages
D164-D170
Published: July 20, 1997
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The spin-flavor structure of the nucleon is investigated within the flavor SU(2) and SU(3) versions of the chiral quark soliton model. We argue that a unique dynamical assumption of the model, i.e. the identification of the rotating hedgehog as a baryon, is strongly reflected in several low energy observables and it appears to win some phenomenological support.
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Byung-Yoon Park, Yongseok Oh
Article type: Article
1997 Volume 95 Issue 4 Pages
D171-D174
Published: July 20, 1997
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The Skyrme model can successfully describe the heavy baryons as bound states of heavy mesons and soliton. We have improved this "bound state approach to the heavy baryons" by working in the "heavy-meson-fixed" frame.
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Y. Tanushi, Y. Kondo, S. Saito, M. Uehara
Article type: Article
1997 Volume 95 Issue 4 Pages
D175-D178
Published: July 20, 1997
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Kaon and pion coupling constants to hyperons are calculated in the bound-state approach to strangeness in the Skyrme-soliton model. The pion and kaon coupling constants are properly defined as matrix elements of source terms of the mesons sandwiched between two single-baryon states. Numerical calculation of the coupling constants shows that the bound-state approach well reproduces the empirical values.
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Sinya AOKI
Article type: Article
1997 Volume 95 Issue 4 Pages
D179-D187
Published: July 20, 1997
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I review the recent status of finite temperature lattice QCD simulations.
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Tetsuo Hatsuda
Article type: Article
1997 Volume 95 Issue 4 Pages
D188-D193
Published: July 20, 1997
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Spin structure of the nucleon in lattice QCD simulations are reviewed. Special emphasize is put on the tensor charge of the nucleon which is related to the transversity distribution of the quarks inside the nucleon.
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Seyong Kim
Article type: Article
1997 Volume 95 Issue 4 Pages
D194-D197
Published: July 20, 1997
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We report our calculation of the long distance matrix elements which are necessary for the inclusive decay rates of the S- and P-wave states of charmonium and bottomonium using quenched lattice QCD. In particular, we carry out the calculation for the color-octet contribution to P-wave decay from the first principles of quantum field theory, which cannot be accommodated in potential model.
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Tsuneo Suzuki
Article type: Article
1997 Volume 95 Issue 4 Pages
D198-D203
Published: July 20, 1997
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Recent studies of confinement based on the idea of abelian monopole condensation are reviewed briefly. Emphasis is placed on the approach to get the effective monoole action using the blockspin transformation on the dual lattice. The trajectory obtained looks to be the renormalized one in SU(2) QCD. The monopole action can be transformed exactly into the dual Ginzburg-Landau model and the hadron string theory.
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M.N. Chernodub, M.I. Polikarpov, A.I. Veselov
Article type: Article
1997 Volume 95 Issue 4 Pages
D204-D210
Published: July 20, 1997
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The general properties of the abelian projection are reviewed. We derive the explicit expression for the abelian functional integral for U(1) abelian theory which corresponds to the abelian projection of the SU(2) gluodynamics. The numerical results for the temperature dependence of the monopole condensate are presented.
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M. -C. Chu
Article type: Article
1997 Volume 95 Issue 4 Pages
D211-D216
Published: July 20, 1997
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We study the temperature dependence of the instanton content of the QCD vacuum using lattice gauge method. With the quenched approximation, we found that the topological susceptibility shows a weak temperature dependence, in good agreement with PCAC prediction, up to the deconfinement temperature, above which rapid suppression sets in. The instanton profile remains remarkably constant as a function of temperature, showing slight deviations only at temperature above 1.5T_c.
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Hideo Nakajima, Sadataka Furui
Article type: Article
1997 Volume 95 Issue 4 Pages
D217-D220
Published: July 20, 1997
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Anthony G. WILLIAMS, Kensuke KUSAKA, Ken M. SIMPSON
Article type: Article
1997 Volume 95 Issue 4 Pages
D221-D226
Published: July 20, 1997
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There is a need for covariant solutions of bound state equations in order to construct realistic QCD based models of mesons and baryons. Furthermore, we ideally need to know the structure of these bound states in all kinematical regimes, which makes a direct solution in Minkowski space (without any 3-dimensional reductions) desirable. The Bethe-Salpeter equation (BSE) for bound states in scalar theories is reformulated and solved for arbitrary scattering kernels in terms of a generalized spectral representation directly in Minkowski space (K. Kusaka et al., PRD 51, 7026 '95). This differs from the conventional Euclidean approach, where the BSE can only be solved in ladder approximation after a Wick rotation.
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Ken-Ichi Aoki
Article type: Article
1997 Volume 95 Issue 4 Pages
D227-D236
Published: July 20, 1997
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We briefly review the basic notions of the non-perturbative renormalization group, and clarify the feature that it gives a systematic approximation scheme without any divergent series nor serious gauge dependence, compared to other perturbative and non-perturbative methods. We apply this new method to dynamical chiral symmetry breaking in QCD and find that the lowest level approximation contains the ladder Schwinger-Dyson equation results. We present chiral phase structures and critical exponents in the fixed gauge coupling analysis, which gives a gauge independent improvement including beyond-the-ladder diagrams.
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Miyuki Kawamura, Kayoko Maeda, Makoto Sakamoto
Article type: Article
1997 Volume 95 Issue 4 Pages
D237-D242
Published: July 20, 1997
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We describe vacuum structure of four-dimensional pure Yang-Mills theory by two different approaches, the Hamiltonian formulation and the stochastic formulation. We can see that the vacuum expectation values for arbitrary operator may expressed by the path integral representation of i/iree-dimansional Yang-Mills therory. Our analysis reveals that this dimensional reduction results from a stochastic nature of the theory, i.e., it maight be exist the random fields in the low energy regime of non abelian gauge theory.
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Tsuneki MATSUKI
Article type: Article
1997 Volume 95 Issue 4 Pages
D243-D246
Published: July 20, 1997
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There arise complications in the Field Strength Formalism of Halpern which must be overcome if we are to treat the dynamics of the theory. It is seen how these troubles are resolved by a close examination of the two dimensional theory. Charge confinement and screening of adjoint charges are exhibited.
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Hitoshi ITO
Article type: Article
1997 Volume 95 Issue 4 Pages
D247-D250
Published: July 20, 1997
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The talk is based on a preprint and a preliminary report was given in a workshop held at Nihon University, March 1995.
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Article type: Appendix
1997 Volume 95 Issue 4 Pages
App2-
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Article type: Appendix
1997 Volume 95 Issue 4 Pages
App3-
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Article type: Cover
1997 Volume 95 Issue 4 Pages
Cover2-
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Article type: Cover
1997 Volume 95 Issue 4 Pages
Cover3-
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