A study of the Cabibbo-Radicati sum rule in the constituent-quark model with relativistic corrections

1996 ◽  
Vol 109 (4) ◽  
pp. 435-443 ◽  
Author(s):  
M. De Sanctis
Keyword(s):  
Quark Model ◽  
Constituent Quark ◽  
Constituent Quark Model ◽  
Sum Rule ◽  
Relativistic Corrections

scholarly journals The nucleon Drell-Hearn-Gerasimov sum rule within a relativistic constituent quark model

1998 ◽  
Vol 418 (3-4) ◽  
pp. 237-245 ◽  
Author(s):  
F. Cardarelli ◽  
B. Pasquini ◽  
S. Simula
Keyword(s):  
Quark Model ◽  
Constituent Quark ◽  
Constituent Quark Model ◽  
Sum Rule

Q 2 evolution of the Drell-Hearn-Gerasimov sum rule in the constituent-quark model

1996 ◽  
Vol 109 (12) ◽  
pp. 1635-1640
Author(s):  
M. De Sanctis ◽  
P. Di Giacomo
Keyword(s):  
Quark Model ◽  
Constituent Quark ◽  
Constituent Quark Model ◽  
Sum Rule

The Drell-Hearn-Gerasimov sum rule and the constituent quark model

1993 ◽  
Vol 15 (3) ◽  
pp. 99-108 ◽  
Author(s):  
D. Drechsel ◽  
M. M. Giannini
Keyword(s):  
Quark Model ◽  
Constituent Quark ◽  
Constituent Quark Model ◽  
Sum Rule

MESON CLOUDS AND DRESSED CONSTITUENT QUARKS IN THE COMPLETE RG-IMPROVEMENT APPROACH

2008 ◽  
Vol 23 (31) ◽  
pp. 5037-5058 ◽  
Author(s):  
K. KESHAVARZIAN ◽  
A. MIRJALILI ◽  
M. M. YAZDANPANAH
Keyword(s):  
Quark Model ◽  
Free Parameter ◽  
Constituent Quark ◽  
Valence Quark ◽  
Constituent Quark Model ◽  
Chiral Quark Model ◽  
Splitting Function ◽  
Renormalization Scale ◽  
Sum Rule ◽  
Meson Cloud

Sea quark densities in the nucleon, based on the constituent quark model are analyzed. To model the asymmetry of these densities, the meson cloud or alternatively chiral quark model (χQM) is used. Valence quark densities of the meson which are required to extract the sea quark densities in the constituent quarks are obtained using the phenomenological valon model. In addition to the standard perturbative QCD approach which uses the [Formula: see text] scheme with a physical choice of renormalization scale, the calculations are also performed using the complete RG-improvement (CORGI) approach. To avoid a physically unacceptable Q2 behavior of the sea densities inside the constituent quarks, we assume that the free parameter which exists in the vertex function of the boson–quark splitting function, is Q2-dependent. Using the unsymmetrized sea densities of the nucleon which result from convoluting the constituent density in a nucleon with the quark density in the constituent quark, the Gottfried sum rule (GSR) is calculated using the standard perturbative and CORGI approaches. The CORGI result is closer to the reported experimental value for the GSR. The extracted sea and valence quark density in a nucleon, using χQM and also the CORGI approach, have been compared with available experimental data and what was obtained, based on χQM in the standard approach. This comparison confirms the anticipated better agreement of the CORGI approach with the data.

scholarly journals Low-lying configurations in a non-relativistic constituent quark model

2007 ◽  
Vol 34 (7) ◽  
pp. 1771-1782 ◽  
Author(s):  
W L Wang ◽  
F Huang ◽  
Z Y Zhang ◽  
Y W Yu ◽  
F Liu
Keyword(s):  
Quark Model ◽  
Constituent Quark ◽  
Constituent Quark Model

THE NLO QCD CALCULATION OF SEA QUARK DISTRIBUTIONS IN THE CORGI APPROACH, BASED ON THE CONSTITUENT QUARK MODEL

2007 ◽  
Vol 22 (24) ◽  
pp. 4519-4535 ◽  
Author(s):  
A. MIRJALILI ◽  
K. KESHAVARZIAN
Keyword(s):  
Quark Model ◽  
Mellin Transform ◽  
Constituent Quark ◽  
Constituent Quark Model ◽  
Standard Approach ◽  
Unknown Parameters ◽  
Electron Positron Annihilation ◽  
Electron Positron ◽  
Physical Scale ◽  
Good Agreement

Sea quark distributions in the NLO approximation, based on the phenomenological valon model or constituent quark model are analyzed. We use the parametrized inverse Mellin transform technique to perform a direct fit with available experimental data and obtain the unknown parameters of the distributions. We try to extend the calculation to the NLO approximation for the singlet and nonsinglet cases in DIS phenomena. We do also the same calculation for electron–positron annihilation. The resulting sea distributions are effectively independent of the process used. The approach of complete RG improvement (CORGI) is employed and the results are compared with the standard approach of perturbative QCD in the [Formula: see text] scheme with a physical scale. The comparisons with data are in good agreement. As is expected, the results in the CORGI approach indicate a better agreement to the data than the NLO calculation in the standard approach.

scholarly journals An overview of the hypercentral constituent quark model

2003 ◽  
Vol 50 (2) ◽  
pp. 263-272 ◽  
Author(s):  
M.M Giannini ◽  
E Santopinto ◽  
A Vassallo
Keyword(s):  
Quark Model ◽  
Constituent Quark ◽  
Constituent Quark Model
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