Showing papers in "Progress in Particle and Nuclear Physics in 1996"

TL;DR: In this article, the relativistic mean field theory for finite nuclei is reviewed and a field theoretical theory for pairing relations is presented and new results for realistic pairing interactions are discussed.

TL;DR: In this article, the systematics and fragmentation of the M1 Scissors Mode in even-even rare earth and actinide nuclei, its deformation dependence and saturation behavior, the existence of the Scissors mode in odd deformed nuclei and 2 + ⊗ 3 − two-phonon E1 excitations in N =82 isotones and Z =50 isotopes.

TL;DR: The Nambu-Jona-Lasinio model as mentioned in this paper is an effective chiral quark theory which incorporates the SU(Nf)L⊗SU(nf)R⊆U(1)V approximate symmetry of Quantum chromodynamics.

TL;DR: In this paper, the authors review the recent efforts to explore the information on masses of heavy matter particles, notably of the top quark and the Higgs boson, as encoded at the quantum level in the renormalization group equations.

TL;DR: In this article, the authors considered quadrupole vibrations and rotational motions and showed that the dynamical symmetry of a model can be used to determine if the model is compatible with the microscopic many-nucleon structure of the nucleus and when it is.

TL;DR: In this article, the ground state properties of heavy baryons (containing at least one quark of type c or b) were studied in a nonrelativistic frame using a realistic interquark potential and the Faddeev formalism to solve the three-body problem.

TL;DR: In this paper, a brief introduction to chiral perturbation theory, the effective field theory of the standard model at low energies, two recent applications are reviewed: elastic pion-pion scattering to two-loop accuracy and the complete renormalized pion nucleon Lagrangian to O(p3 in the chiral expansion).

TL;DR: In this paper, the authors reviewed the present status of the QCD instanton vacuum, emphasizing the mechanism of chiral symmetry breaking and of the generation of the constituent quark mass, and obtained the Nambu-Jona-Lasinio-type effective theory to which QCD is reduced at low momenta.

TL;DR: An overview of dynamical diffraction of neutrons in perfect crystals, neutron interferometric tests of various quantal concepts as well as neutronic observation of geometric phase can be found in this paper.

TL;DR: The status of the search for NN-decoupled resonances in the πNN-system is reviewed in this article, where a short survey on the history of dibaryon searches reactions suitable for detecting such resonances are discussed.

TL;DR: In this paper, the mass of a six-quark system with JP = 0−, T = 0 quantum numbers employing a cluster model and a shell model basis to diagonalize the nonrelativistic quark model Hamiltonian was calculated.

TL;DR: In this article, form factors and coupling constants for the γ ∗ π 0 γ, ϱππ and γπϱ interactions generated by a model field theory that produces finite size q q meson modes are discussed.

TL;DR: In this paper, a new muon experiment at CERN was proposed to measure the gluon polarisation using open charm production, which is linked to the Gluon distribution via the photon-gluon fusion process.

TL;DR: In this article, the use of Radioactive Beams, either at low or at high energy, in Nuclear Astrophysics, mainly for studying violent stellar events, is reviewed.

TL;DR: In this article, the nucleon-nucleon interaction at short range is analyzed in terms of six-quark configurations on a base of numerical solutions of modified RGM equations.

TL;DR: In this article, a new and intuitive reasoning of Bloch-Nordsieck cancellation of IR singular contributions is given, and the total number of produced quarks is calculated and found to be quite sizeable.

TL;DR: In this paper, a dynamical mechanism for the admixture of polarized s s pairs to the nucleon wave function is suggested as the origin of the spin asymmetry of the strange sea.

TL;DR: In this paper, two descriptions of the nucleon's strange vector form factors in the framework of vector meson dominance have been discussed, and an updated and extended version of Jaffe's dispersion analysis has been proposed.

TL;DR: In this article, the current status of the πNN-resonance search with I(J P ) = 0(0 − ) and M = 2.06 GeV in the 2π production in pp collisions is reported.

TL;DR: In this article, the semibosonized Nambu - Jona-Lasinio model in its SU(2) and SU(3) versions with scalar and pseudoscalar couplings is applied on the chiral circle to baryons.

TL;DR: In this paper, the authors review the recent investigations of nuclear structure physics based on relativistic mean-field theory which take into account the fact that the nucleon contains light quarks.

TL;DR: In this article, a recent one-meson loop calculation of the π-π phase shifts and the electromagnetic form factor of the pion, where isospin symmetry breaking is included, giving rise to the ϱ-ω-mixing.

TL;DR: In this paper, the role of meson-meson correlations in baryon-baryon and antibaryon -baryons interactions is reviewed and a review of the recent work of the Julich group about meson correlations is presented.

TL;DR: In this paper, the authors describe the description of baryons as topological solitons in effective chiral meson theories and show that the 1 N c expansion essentially works as expected.

TL;DR: In this paper, the applications of skyrmions to the derivation of the nucleon-nucleon force are reviewed with attention to the use of the product ansatz, additional terms in the lagrangian, baryon resonance admixtures, the instanton ansatz and dilatons.

TL;DR: The recent search for non $q \\bar{q}$ mesons in $pi^{-}p$ interactions at Brookhaven National Laboratory is summarized in this paper, and many final states such as $eta \\pi, $\\eta' \\pi''-}, $a_{0} \\pi,''f''1'' \\pi ''-'', ''a'' 2'', ''b'' 3''''-''b''''p'' are under investigation.

TL;DR: In this article, a recent attempt to deal with nonperturbative features of QCD by analytical means, using a manifestly gauge invariant, canonical approach, is presented.

TL;DR: In this paper, the authors report on recent experimental results obtained at the Amsterdam (700-900) MEV Pulse Stretcher and Storage ring (AmPS) at NIKHEF: high-momentum components in few-body (2H,4He) and heavy-systems (208Pb); and two proton correlations from the reaction on 16O.

TL;DR: In this article, the authors investigated the threshold H(e,e′p)π0 reaction at q2 = −0.1 (GeV/c)2 as a test of chiral perturbation theory (ChPT), a low energy approximation to QCD.