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 show...

The baryon axial currents are calculated at one–loop order in heavy baryon chiral perturbation theory by employing both a cutoff and dimensional regularization. Data from the semileptonic baryon decays is used to perform a least–squares fit to the two axial couplings D and F of the effective Lagrangian. Predictions for the momentum dependent axial form factors are made and the two different reg...

We apply the 1/Nc expansion in QCD to the baryon vertices. We find new model independent properties for the isoscalar and isovector baryon vertices from the view point of 1/Nc expansion in QCD. One of these results, I = J rule, have been already found. The other properties, new I = J rules, are the rules about the isospin and strangeness dependence for the baryon vertices. ∗e-mail addresses: ta...

We point out that the effective theory for the Randall-Sundrum braneworld models with bulk fields contains the baryon number violation process depending on the spacetime dynamics. Combining to the curvature-current interaction, the net baryon number observed today may be explained. The resultant baryon to entropy ratio is determined by the ratio of the Planck scales in four dimensional and five...

We present a new mechanism of spontaneous baryogenesis. Usually such mechanisms require a derivative coupling between a scalar field and baryon current. In our model, the scalar field instead derivatively couples to a current associated with some global symmetry U(1)(Q). In this case, baryogenesis is still possible provided that an interaction exists, which violates the baryon and U(1)(Q) symme...

If baryons couple only with ω-mesons, one found the baryon spectral function may be negative. We show this unacceptable result is caused by the kμkν-terms in the ω-meson propagator. Their contribution may not vanish in approximate calculations, though the baryon current conserves. A rule is suggested, by which the calculated baryon spectral function is well behaved. PACS: 21.60. Jz, 21.65+f, 11...