Covariant electromagnetic and axial form factors of the nucleons from a chiral quark model

2001 ◽  
Author(s):  
R. F. Wagenbrunn
Keyword(s):  
Quark Model ◽  
Form Factors ◽  
Chiral Quark Model ◽  
Axial Form

scholarly journals Strange nucleon form factors in the perturbative chiral quark model

2002 ◽  
Vol 66 (5) ◽  
Author(s):  
V. E. Lyubovitskij ◽  
P. Wang ◽  
Th. Gutsche ◽  
Amand Faessler
Keyword(s):  
Quark Model ◽  
Form Factors ◽  
Chiral Quark Model ◽  
Nucleon Form Factors

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.

scholarly journals Axial form factor of the nucleon in the perturbative chiral quark model

2004 ◽  
Vol 30 (6) ◽  
pp. 793-810 ◽  
Author(s):  
K Khosonthongkee ◽  
V E Lyubovitskij ◽  
Th Gutsche ◽  
Amand Faessler ◽  
K Pumsa-ard ◽  
...  
Keyword(s):  
Form Factor ◽  
Quark Model ◽  
Chiral Quark Model ◽  
Axial Form Factor ◽  
Axial Form

q2-Dependence of Heavy-to-Light Transitions

1997 ◽  
Vol 12 (09) ◽  
pp. 653-660 ◽  
Author(s):  
M. A. Ivanov ◽  
Yu. M. Valit
Keyword(s):  
Quark Model ◽  
Form Factors ◽  
Physical Region ◽  
Relativistic Quark Model ◽  
Vector Form ◽  
Pole Dominance ◽  
Axial Form ◽  
Light Form

The q2-dependence of the heavy-to-light form factors in the full physical region is obtained within the relativistic quark model with heavy infrapropagators. It is shown that the behavior of the vector form factors agrees with the pole dominance hypothesis whereas the behavior of the axial form factors is rather different from the polelike function.

scholarly journals EXCITED SCALAR MESONS IN A CHIRAL QUARK MODEL

1999 ◽  
Vol 14 (29) ◽  
pp. 4621-4639 ◽  
Author(s):  
M. K. VOLKOV ◽  
V. L. YUDICHEV
Keyword(s):  
Quark Model ◽  
Chiral Symmetry Breaking ◽  
Standard Form ◽  
Form Factors ◽  
Radial Excitation ◽  
Chiral Quark Model ◽  
Scalar Mesons ◽  
Pseudoscalar Mesons ◽  
Meson States

First radial excitations of the scalar and pseudoscalar meson nonets as well as their ground states are described as quark–antiquark bound systems in the framework of a nonlocal chiral quark model of the NJL type. Glueball states and their possible mixing with members of the [Formula: see text] multiplets are not considered. Radial excitations are described by means of simple polynomial form factors in the momentum–space which are introduced into the four-quark vertices of the quark Lagrangian. The form factors are chosen in the regime of spontaneous chiral symmetry breaking so that the gap equations do not change their standard form, which provides fulfillment of the low energy theorems. All free parameters of the form factors are fixed by experimentally observed masses of pseudoscalar mesons. All masses of the scalar mesons are predicted. The local six-quark 't Hooft interaction is introduced to solve the so-called UA(1)-problem. The (four particle) singlet–octet mixing for the ground and radially excited states of scalar and pseudoscalar mesons is taken into account. The widths of the main strong decays of the first radial excitation of the scalar meson nonet are calculatedin satisfactory agreement with experimental data. Classification of the considered meson nonets is given. It is shown that the meson states a0(1450), f0(1370), fJ(1710) and [Formula: see text] are the first radial excitations of a0(980), f0(400-1200), f0(980), [Formula: see text].

scholarly journals Study of baryon octet charge form factors in perturbative chiral quark model

2014 ◽  
Vol 29 ◽  
pp. 1460252
Author(s):  
X. Y. Liu ◽  
K. Khosonthongkee ◽  
A. Limphirat ◽  
Y. Yan
Keyword(s):  
Experimental Data ◽  
Wave Function ◽  
Quark Model ◽  
Form Factors ◽  
Baryon Octet ◽  
Chiral Quark Model ◽  
Charge Form ◽  
Quark Wave Function ◽  
Theoretical Results ◽  
Good Agreement

The charge form factors of baryon octet are studied in the perturbative chiral quark model (PCQM). The relativistic quark wave function is extracted by fitting the theoretical results of the nucleon charge form factors to the experimental data and the predetermined quark wave function is applied to study the charge form factors of other octet baryons. The PCQM results are found, based on the predetermined quark wave function, in good agreement with the experimental data.

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