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76 records were found.

Structure and production of Theta+

Comment: 4 pages, Proceedings for the YITP Workshop on Multi-quark Hadrons: Four, Five and More? (YITP-W-03-21), Kyoto, Japan, 17-19 Feb 2004

Phenomenological Study of Excited Baryons

Comment: 9 pages, 2 eps figures "Talk given at the workshop Future Directions in Quark Nuclear Physics", Adelaide, March (1998)

Structure of the nuclear force in a chiral quark-diquark model

Comment: 12 pages, 9 figures

Structure of the Nucleon and Roper Resonance with Diquark Correlations

Comment: To appear in the proceedings of Chiral 07, Osaka, Japan, November 13-16, 2007. 4pages, 4figures

Chiral phase properties of finite size quark droplets in the Nambu--Jona-Lasinio model

Comment: RevTex4, 9 pages, 6 figures, to be published in Phys. Rev. D

Chiral symmetry breaking and stability of quark droplets

We discuss the stability of strangelets -- quark droplets with strangeness -- in the Nambu--Jona-Lasinio model supplemented by a boundary condition for quark confinement. Effects of dynamical chiral symmetry breaking are considered properly inside quark droplets of arbitrary baryon number. We obtain the energy per baryon number of quark droplets with baryon number from one to thousands. It is shown that strangelets are not the ground states as compared with nuclei, though they can be locally stable.

Quark droplets with chiral symmetry in the Nambu--Jona-Lasinio model

We discuss the stability of strangelets by considering dynamical chiral symmetry breaking. For quark droplets of finite volume, we formulate the Nambu--Jona-Lasinio model with a basis set of the quark wave functions in the chiral bag model. Chiral symmetry breaking for the finite volume bag is discussed in a mean field approximation. Effects of the pion cloud including the chiral Casimir effect are investigated. Physical quantities of the quark droplets such as masses and radii are obtained for quark droplets of baryon numbers up to five. We also apply our model setting to the nucleon and discuss the stability of the quark droplets against nuclei.

Effect of negative energy components for two-nucleon systems in the relativistic framework with the separable ansatz

Comment: 18 pages, 15 figures

Magnetic interaction induced by the anomaly in kaon-photoproductions

Comment: 8 pages, 3 figures

$\pi N$ and $\pi\pi N$ Couplings of the $\Delta(1232)$ and its Chiral Partners

We investigate the interactions and chiral properties of the four spin-$\thalf$-baryons : $N^-(D_{13})$, $N^+(P_{13})$, $\Delta^+(P_{33})$ and $\Delta^-(D_{33})$ together with the nucleon. We construct the $SU(2)_R \times SU(2)_L$ invariant interactions between the spin-$\half$ and -$\thalf$ baryons with the aid of a new, specially developed spin and isospin projection technique for these baryon fields, where the chiral invariant interactions contain one- and two-pion couplings. We obtain simple relations for the coupling constants of the one- and two-pion spin $\half-\thalf$ transitions terms. The relation for the one-pion interactions reasonably agrees with the experiments, which suggests that these spin-$\thalf$ baryons are chiral partners.