Extension of the Mass Operator in the Symmetric Quark Model for Negative-Parity Baryon Resonances

1971 ◽  
Vol 3 (1) ◽  
pp. 199-206 ◽  
Author(s):  
Marvin Resnikoff
Keyword(s):  
Quark Model ◽  
Mass Operator ◽  
Negative Parity ◽  
Baryon Resonances

Non-Strange Baryon Resonances in the Isgur-Karl Model Including the N=3 Oscillator Shell

1994 ◽  
Vol 49 (7-8) ◽  
pp. 733-745
Author(s):  
Stefan Querbach ◽  
Martin Kretzschmar
Keyword(s):  
Constituent Quark Model ◽  
Negative Parity ◽  
Shift Analysis ◽  
Resonance Energies ◽  
Model Predictions ◽  
Excited Baryon ◽  
Oscillator Shell ◽  
Pion Nucleon ◽  
Configuration Mixing ◽  
Baryon Resonances

Abstract The nonrelativistic constituent quark model for excited baryon states in the version proposed by Isgur and Karl is extended toward higher energies by including all states containing up to three oscillator excitation quanta. At high energies baryon resonances with spins up to 9/2 become accessible. At all energies and in particular for lower spins strong configuration mixing is obtained. Model predictions are compared to the empirical resonance energies derived in the Karlsruhe-Helsinki pion nucleon phase shift analysis. A search is made for parameter sets that apply simultaneously to the positive parity and the negative parity states. Numerical results are presented and discussed in relation to experimental data and to other theoretical works.

THE CHIRAL QUARK MODEL AND BARYON PHENOMENOLOGY

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1785-1790 ◽  
Author(s):  
D. O. RISKA
Keyword(s):  
Quark Model ◽  
Form Factors ◽  
Axial Current ◽  
Chiral Quark Model ◽  
Pion Decay ◽  
Decay Widths ◽  
Nucleon Form Factors ◽  
Baryon Spectra ◽  
Baryon Resonances ◽  
Covariant Quark Model

The chiral quark model posits that pions couple to the axial current of constituent quarks. This chiral pion coupling governs the pion decays of baryon resonances and also implies pion and multipion interactions between the quarks. The qualitative features of this model for the description of pionic decay widths and baryon spectra are outlined. When the covariant quark model wave function for the nucleon is chosen so as to describe the empirical nucleon form factors the pion decay widths of the positive parity resonances are underpredicted. This indicates the presence of significant multiquark components in these resonances.

Baryon Resonances in a Constituent Quark Model

2000 ◽  
Vol 137 ◽  
pp. 169-188 ◽  
Author(s):  
Masaki Arima ◽  
Keiichi Masutani ◽  
Toru Sato
Keyword(s):  
Quark Model ◽  
Constituent Quark ◽  
Constituent Quark Model ◽  
Baryon Resonances

scholarly journals Decays of Baryon Resonances. I: Equivalence of an l-broken SU(6)W Model to a Quark Model

1978 ◽  
Vol 59 (1) ◽  
pp. 291-293 ◽  
Author(s):  
S. Ishida ◽  
M. Oda ◽  
J. Otokozawa
Keyword(s):  
Quark Model ◽  
Baryon Resonances

Higher Meson and Baryon Resonances in aSU(18)Quark Model

1966 ◽  
Vol 145 (4) ◽  
pp. 1269-1272 ◽  
Author(s):  
Asher Peres
Keyword(s):  
Quark Model ◽  
Baryon Resonances

EFFECTIVE DEGREES OF FREEDOM IN LOW-ENERGY QUANTUM CHROMODYNAMICS

2013 ◽  
Vol 28 (26) ◽  
pp. 1360022 ◽  
Author(s):  
WILLIBALD PLESSAS
Keyword(s):  
Quantum Mechanics ◽  
Quantum Chromodynamics ◽  
Quark Model ◽  
Chiral Symmetry ◽  
Degrees Of Freedom ◽  
Constituent Quark ◽  
Mass Operator ◽  
Constituent Quark Model ◽  
Low Energy ◽  
Energy Quantum

Confinement and spontaneous breaking of chiral symmetry are assumed to generate the governing degrees of freedom of low-energy quantum chromodynamics. On this basis a relativistic constituent-quark model is constructed and formulated along an invariant mass operator within Poincaré-invariant quantum mechanics. The model is effectively applied to the spectroscopy of all known baryons of flavors u, d, s, c and b. The mass-operator eigenstates are furthermore tested with regard to the baryon electromagnetic and axial form factors. Through using the point form of relativistic quantum mechanics, these observables are obtained in a manifestly covariant manner. For all light and strange baryon ground states the electroweak structures are reproduced either in good agreement with phenomenology or, if no experimental data exist, in consistency with results available from lattice quantum chromodynamics. It is concluded that the relativistic constituent-quark model, relying on {QQQ} Fock states only, provides a universal framework for the description of low-energy baryons. The most important ingredients are spontaneous chiral-symmetry breaking and strict relativistic invariance.

Decays of Negative-Parity Baryons in a Quark Model

1968 ◽  
Vol 175 (5) ◽  
pp. 2027-2029 ◽  
Author(s):  
D. R. Divgi
Keyword(s):  
Quark Model ◽  
Negative Parity
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