scholarly journals Covariant baryon charge radii and magnetic moments in a chiral constituent-quark model

2004 ◽  
Vol 70 (9) ◽  
Author(s):  
K. Berger ◽  
R. F. Wagenbrunn ◽  
W. Plessas
Keyword(s):  
Quark Model ◽  
Constituent Quark ◽  
Magnetic Moments ◽  
Constituent Quark Model ◽  
Charge Radii ◽  
Baryon Charge

scholarly journals Mass spectra of triply heavy charm-beauty baryons

2019 ◽  
Vol 202 ◽  
pp. 06001
Author(s):  
Zalak Shah ◽  
Ajay Kumar Rai
Keyword(s):  
Excited State ◽  
Quark Model ◽  
Mass Spectra ◽  
Constituent Quark ◽  
Magnetic Moments ◽  
Constituent Quark Model ◽  
Potential Term ◽  
First Order ◽  
Regge Trajectories ◽  
First Order Correction

We extract the mass spectra of triply heavy charm-beauty baryons using Hypercentral constituent quark model. The first order correction is also added to the potential term of Hamiltonian. The radial and orbital excited state masses are also determined. Moreover, the Regge trajectories and magnetic moments are also given for these baryons.

Charge radii of octet and decuplet baryons in chiral constituent quark model

Pramana ◽  
2013 ◽  
Vol 81 (3) ◽  
pp. 449-465 ◽  
Author(s):  
NEETIKA SHARMA ◽  
HARLEEN DAHIYA
Keyword(s):  
Quark Model ◽  
Constituent Quark ◽  
Constituent Quark Model ◽  
Charge Radii

CHARGE RADII OF SPIN $\frac{1}{2}^+$ AND SPIN $\frac{3}{2}^+$ CHARMED BARYONS IN THE CHIRAL CONSTITUENT QUARK MODEL

2013 ◽  
Vol 28 (14) ◽  
pp. 1350052 ◽  
Author(s):  
NEETIKA SHARMA ◽  
HARLEEN DAHIYA
Keyword(s):  
Symmetry Breaking ◽  
Quark Model ◽  
Constituent Quark ◽  
Constituent Quark Model ◽  
Qualitative Description ◽  
Charmed Baryons ◽  
Charge Radii ◽  
Parametrization Method ◽  
The One

The chiral constituent quark model (χCQM) with general parametrization method (GPM) has been extended to calculate the charge radii of the charmed spin [Formula: see text] and spin [Formula: see text] baryons. The implications of such a model have been investigated for the effects of symmetry breaking and GPM parameters pertaining to the one-, two- and three-quark contributions. It is found that the χCQM along with these effects is successful in giving a quantitative and qualitative description of the charge radii of charmed baryons. In particular, it is able to account for the nonzero values of charge radii for the neutral charmed baryons.

scholarly journals Magnetic Moments of S-Shell Pentaquarks in the Constituent Quark Model

2005 ◽  
Vol 113 (4) ◽  
pp. 801-808 ◽  
Author(s):  
T. Inoue ◽  
V. E. Lyubovitskij ◽  
T. Gutsche ◽  
A. Faessler
Keyword(s):  
Quark Model ◽  
Constituent Quark ◽  
Magnetic Moments ◽  
Constituent Quark Model

Exchange Currents in Baryons

1997 ◽  
Vol 52 (12) ◽  
pp. 877-940 ◽  
Author(s):  
Alfons J Buchmann
Keyword(s):  
Quark Model ◽  
Quadrupole Moment ◽  
Charge Radius ◽  
Constituent Quark ◽  
Magnetic Moments ◽  
Impulse Approximation ◽  
Constituent Quark Model ◽  
Pion Exchange ◽  
Electromagnetic Current ◽  
Gluon Exchange

This paper reviews calculations of the electromagnetic properties of baryons using the constituent quark model. We start with a short discussion of spontaneous chiral symmetry breaking, which is essential in understanding the transition from QCD to the constituent quark model. We then discuss a chiral version of the constituent quark model, which simulates the symmetries and dynamical content of the underlying field theory in terms of gluon, pion and sigma exchange between constituent quarks. We show that the electromagnetic current charge and current operators, usually approximated by one-body operators (impulse approximation), must be supplemented by appropriate two-body terms (exchange currents). The latter represent the gluon and pion exchange degrees of freedom in the electromagnetic current operator. These exchange currents must be included for reasons of completeness and consistency. Most importantly, however, they are needed in order for the electromagnetic current to be conserved. We also study the effect of scalar exchange currents connected with the confinement and sigma exchange potentials. By including these twobody exchange currents we go beyond the single-quark impulse approximation, which has mainly been used up to now. The inclusion of gluon- pion-, and scalar-exchange currents in the quark potential model is the new point of the present work. We show that for some observables, such as the magnetic moments, charge, and magnetic radii of the proton and charged Δ (1232) states, exchange currents contribute at the level of some 10%. The same holds true for the magnetic moments of the entire baryon octet, with the exception of the Ξ- magnetic moment. On the other hand, the neutron charge radius, the quadrupole moments of the Δ, and the N → Δ transition quadrupole moment, are dominated by pion and gluon exchange contributions to the charge density operator. The inclusion of the pion and gluon exchange currents leads to a neutron charge radius of the correct size and sign. Based on the gluon and pion exchange current diagrams, we derive parameter-free relations between the neutron charge radius, the quadrupole moment of the Δ, and the N → Δ transition quadrupole moment. Neglecting configuration mixing, we find that the neutron charge radius and the N → Δ transition quadrupole moment are simply related as QN→Δ = r2n√2. The implications of Siegert's theorem for the calculation of the E2 form factor in the N → Δ transition are studied. Finally, we discuss the axial coupling constant of the nucleon. We show that the inclusion of axial pair exchange currents does not significantly alter the NRQM prediction.

scholarly journals Baryon magnetic moments: Symmetries and relations

2018 ◽  
Vol 175 ◽  
pp. 06001 ◽  
Author(s):  
Assumpta Parreño ◽  
Martin J. Savage ◽  
Brian C. Tiburzi ◽  
Jonas Wilhelm ◽  
Emmanuel Chang ◽  
...  
Keyword(s):  
Quark Model ◽  
Constituent Quark ◽  
Magnetic Moments ◽  
Constituent Quark Model ◽  
Quark Masses ◽  
Symmetric Point ◽  
Down Quark ◽  
Model Predictions ◽  
Insight Into ◽  
Shed Light

Magnetic moments of the octet baryons are computed using lattice QCD in background magnetic fields, including the first treatment of the magnetically coupled ∑0- ⋀ system. Although the computations are performed for relatively large values of the up and down quark masses, we gain new insight into the symmetries and relations between magnetic moments by working at a three-flavor mass-symmetric point. While the spinflavor symmetry in the large Nc limit of QCD is shared by the naïve constituent quark model, we find instances where quark model predictions are considerably favored over those emerging in the large Nc limit. We suggest further calculations that would shed light on the curious patterns of baryon magnetic moments.

Why the Constituent Quark Model Works for Baryon Magnetic Moments

1999 ◽  
Vol 16 (6) ◽  
pp. 403-405 ◽  
Author(s):  
Xiang-song Chen ◽  
Di Qing ◽  
Fan Wang
Keyword(s):  
Quark Model ◽  
Constituent Quark ◽  
Magnetic Moments ◽  
Constituent Quark Model
Sign in / Sign up

Export Citation Format

Share Document