th / 0 20 60 71 v 1 2 8 Ju n 20 02 Baryonic masses based on the NJL model
نویسندگان
چکیده
We employ the Nambu Jona–Lasinio model to determine the vacuum pressure on the quarks in a baryon and hence their density inside. Then we estimate the baryonic masses by implementing the local density approximation for the mean field quark energies obtained in a uniform and isotropic system. We obtain a fair agreement with the experimental masses.
منابع مشابه
- th / 0 20 60 33 v 1 1 4 Ju n 20 02 Multipole Amplitudes of Pion Photoproduction on Nucleons up to 2 GeV within Dispersion Relations and Unitary Isobar Model
Two approaches for analysis of pion photo-and electroproduction on nucleons in the resonance energy region are checked at Q 2 = 0 using the results of GWU(VPI) partial-wave analysis of photoproduction data. The approaches are based on dispersion relations and unitary isobar model. Within dispersion relations good description of photoproduction multipoles is obtained up to W = 1.8 GeV. Within un...
متن کامل- th / 0 20 60 65 v 1 2 6 Ju n 20 02 Semiclassical evaluation of average nuclear one and two body matrix elements
Thomas-Fermi theory is developed to evaluate nuclear matrix elements on the average. One and two body matrix elements are compared with quantal results and it is demonstrated that the semiclassical matrix elements nicely follow the quantal values on the mean. Various physical situations are ad-dresed where the semiclassical evaluation of the one and two body matrix elements can be useful.
متن کامل- th / 0 20 60 37 v 1 1 8 Ju n 20 02 Pionic Atom Formation in Halo Nuclei by ( d , 3 He ) Reactions
We investigate the formation cross sections of the deeply bound pionic atoms on halo nuclei theoretically. We consider one-neutron pick-up (d,3He) reaction for the pionic atom formation and find that the formation rate is significantly increased by the existence of the halo neutron with long tail of the wave function. This enhancement is expected to increase the experimental feasibility for the...
متن کاملar X iv : h ep - p h / 02 02 09 8 v 1 1 1 Fe b 20 02 COLOR - FLAVOR ( UN - ) LOCKING
The structure of the phase diagram of strongly interacting matter at moderate densities is calculated within a 3-flavor NJL-type quark model with realistic quark masses. We focus on the influence of the selfcon-sistently determined effective strange quark mass on the color-flavor unlocking phase transition.
متن کامل- th / 0 20 60 70 v 1 2 8 Ju n 20 02 On the analytic solution of the pairing problem : one pair in many levels
We search for approximate, but analytic solutions of the pairing problem for one pair of nucleons in many levels of a potential well. For the collective energy a general formula, independent of the details of the single particle spectrum, is given in both the strong and weak coupling regimes. Next the displacements of the solutions trapped in between the single particle levels with respect to t...
متن کامل