Electroweak properties of baryons in a covariant chiral quark model (original) (raw)

Covariant electroweak nucleon form factors in a chiral constituent-quark model

The European Physical Journal A - Hadrons and Nuclei, 2002

Results for the proton and neutron electric and magnetic form factors as well as the nucleon axial and induced pseudoscalar form factors are presented for the chiral constituent quark model based on Goldstone-boson-exchange dynamics. The calculations are performed in a covariant framework using the point-form approach to relativistic quantum mechanics. The direct predictions of the model yield a remarkably consistent picture of the electroweak nucleon structure.

Covariant nucleon electromagnetic form factors from the Goldstone-boson-exchange quark model

Physics Letters B, 2001

We present a study of proton and neutron electromagnetic form factors for the recently proposed Goldstone-boson-exchange constituent quark model. Results for charge radii, magnetic moments, and electric as well as magnetic form factors are reported. The calculations are performed in a covariant framework using the point-form approach to relativistic quantum mechanics. All the predictions by the Goldstone-boson-exchange constituent quark model are found in remarkably good agreement with existing experimental data.

Relativistic study of nucleon electroweak properties in a constituent-quark model

The European Physical Journal A - Hadrons and Nuclei, 2003

We discuss the predictions of the Goldstone-boson-exchange constituent-quark model for the proton and neutron electric and magnetic form factors as well as the nucleon axial and induced pseudoscalar form factors. The results are calculated in a covariant framework using the point-form approach to relativistic quantum mechanics. The only input into the calculations is the nucleon wave function from the constituent-quark model. A remarkably consistent picture, with all aspects of the electroweak nucleon structure close to existing experimental data, is obtained.

Electroweak properties of the nucleon in a chiral constituent quark model

2002

Results for all elastic electroweak nucleon form factors are presented for the chiral constituent quark model based on Goldstone-boson-exchange dynamics. The calculations are performed in a covariant framework using the point-form approach to relativistic quantum mechanics. The direct predictions of the model yield a remarkably consistent picture of the electroweak nucleon structure.

Covariant axial form factor of the nucleon in a chiral constituent quark model

Physics Letters B, 2001

The axial form factor G A of the nucleon is investigated for the Goldstoneboson-exchange constituent quark model using the point-form approach to relativistic quantum mechanics. The results, being covariant, show large contributions from relativistic boost effects. The predictions are obtained directly from the quark-model wave functions, without any further input such as vertex or constituent-quark form factors, and fall remarkably close to the available experimental data.

Nucleon electromagnetic and axial form factors in point-form relativistic quantum mechanics

2002

Results for the proton and neutron electric and magnetic form factors as well as the nucleon axial form factor are presented for constituent quark models, based on either one-gluon-exchange and Goldstone-boson-exchange dynamics. The calculations are performed in a covariant framework using the point-form approach to relativistic quantum mechanics. The only input to the calculations is the nucleon wave function of the corresponding constituent quark model. A comparison is given to results of the instanton-induced constituent quark model treated with the Bethe-Salpeter equation.

Relativistic quark model for the electromagnetic form factors

Physical Review D - PHYS REV D, 2009

We compute the electromagnetic form factors and the decuplet baryon magnetic moments using a quark model application of the covariant spectator theory. Our predictions for the electromagnetic form factors can be tested in the future by lattice QCD simulations at the physical strange quark mass.

Electromagnetic Properties of Baryons and the Quark Model

Progress of Theoretical Physics, 1966

I I 1243. The electromagnetic properties of baryons are investigated from the viewpoint of the Sakata Model, in which quarks are chosen as the three fundamental particles. Since vector mesons couple to the baryon indirectly through the constituent quarks, the electromagnetic form factor of the baryon has a further contribution coming from the baryon wave function as well as contributions from p, w and ifJ. This allows us to get rid of the difficulty encountered in the usual vector meson model in fitting the data with only the known p, w and r/J. It is also shown that in the "nonet limit" only p and w contribute to the nucleon form factors ; This explains the experimental relations and•

Nucleon Electromagnetic Form Factors in a chiral constituent-quark model

1999

The electromagnetic form factors of the nucleon are calculated in an extended chiral constituent-quark model where the effective interaction is described by the exchange of pseudoscalar, vector, and scalar mesons. Two-body current-density operators, constructed consistently with the extended model Hamiltonian in order to preserve gauge invariance and current conservation, are found to give a significant contribution to the nucleon magnetic form factors and improve the estimates of the nucleon magnetic moments.