A. Blotz

The SU(3)-Nambu-Jona-Lasinio soliton in the collective quantization formulation

Abstract On grounds of a semibosonized Nambu-Jona-Lasinio model, which has SU(3) R ⊗ SU(3) L symmetry in the chiral limit, mass splittings for spin 1 2 and spin 3 2 baryons are studied in the presence of an explicit chiral-symmetry-breaking strange-quark mass. To this aim these strangeness-carrying baryons are understood as SU(3)-rotational excitations of an SU(2)-embedded soliton solution. Therefore, within the framework of collective quantization, the fermion determinant with the strange-quark mass is expanded up to the second order in the flavor rotation velocity and up to the first order in this quark mass. Besides, the strange and non-strange moments of inertia, which have some counterparts within the Skyrme model, some so-called anomalous moments of inertia are obtained. These can be related to the imaginary part of the effective euclidian action and contain among others the anomalous baryon current. This is shown in a gradient expansion up to the first non-vanishing order. Together with the Σ-commutator these are the solitonic ingredients of the collective hamiltonian, which is then diagonalized by means of strict perturbation theory in the strange-quark mass and by the Yabu-Ando method. Both methods yield very good results for the masses of the spin 1 2 and 3 2 baryons. The former one reproduces some interesting mass formulas of Gell-Mann, Okubo and of Guadagnini and the latter one is able to describe the mass splittings up to a few MeV.

Electromagnetic form factors of the SU(3) octet baryons in the semibosonized SU(3) Nambu-Jona-Lasinio model.

The electromagnetic form factors of the SU(3) octet baryons are investigated in the semibosonized SU(3) Nambu{endash}Jona-Lasinio model (chiral quark-soliton model). The rotational 1/{ital N}{sub {ital c}} and strange quark mass corrections in linear order are taken into account. The electromagnetic charge radii of the nucleon and magnetic moments are also evaluated. It turns out that the model is in remarkably good agreement with the experimental data. {copyright} {ital 1996 The American Physical Society.}

1/Nc rotational corrections to gA and isovector magnetic moment of the nucleon

The

The connection between soliton and vacuum regularization in the Nambu-Jona-Lasinio model

1/N_c

Rotational corrections to axial currents in semibosonized SU(3) Nambu-Jona-Lasinio model

rotational corrections to the axial vector constant and the isovector magnetic moment of the nucleon are studied in the Nambu -- Jona-Lasinio model. We follow a semiclassical quantization procedure in terms of path integrals in which we can include perturbatively corrections in powers of angular velocity

The spin of the proton in the solitonic SU (3) NJL model

Omega sim frac 1{N_c}

Strangeness in the scalar form factor of the nucleon

. We find non-zero

Magnetic moments of the SU(3) octet baryons in the semibosonized SU(3) Nambu-Jona-Lasinio model

1/N_c

HYPERONS IN EFFECTIVE CHIRAL QUARK MODELS

order corrections from both the valence and the Dirac sea quarks. These corrections are large enough to resolve the long-standing problem of a strong underestimation of both

The Strange content of the baryons in the SU(3) Nambu-Jona-Lasinio model

g_A