scholarly journals Boundary effects on constituent quark masses and on chiral susceptibility in a four-fermion interaction model

2021 ◽  
pp. 125885
Author(s):  
Luciano M. Abreu ◽  
Elenilson S. Nery ◽  
Emerson B.S. Corrêa
Keyword(s):  
Constituent Quark ◽  
Interaction Model ◽  
Boundary Effects ◽  
Quark Masses ◽  
Chiral Susceptibility

CHIRAL QCD GENERATES CONSTITUENT QUARK MASSES

1988 ◽  
Vol 03 (16) ◽  
pp. 1595-1602 ◽  
Author(s):  
J. PRASCHIFKA ◽  
R.T. CAHILL ◽  
C.D. ROBERTS
Keyword(s):  
Form Factor ◽  
Quark Mass ◽  
Constituent Quark ◽  
Bound State ◽  
Variational Technique ◽  
Quark Masses ◽  
Constituent Quark Mass ◽  
Insight Into

Constituent quark masses are shown to arise naturally in an approximation to chiral QCD. The colour [Formula: see text] diquark component of the nucleon is studied using a new variational technique to solve a Bethe-Salpeter equation for this qq bound state in massless QCD. The resultant diquark form factor Γ(q) exhibits a dramatic peaking for (Euclidean) momentum q2≈(0.2 GeV )2 which, we show, signals the generation of a constituent quark mass of ≈270 MeV , and which provides a significant insight into deep inelastic leptonnucleon scattering results.

scholarly journals Self-Consistent Pushing and Cranking Corrections to the Meson Fields of the Chiral Quark-Loop Soliton

1998 ◽  
Vol 07 (01) ◽  
pp. 121-138 ◽  
Author(s):  
M. Schleif ◽  
R. Wünsch ◽  
T. Maissner
Keyword(s):  
Constituent Quark ◽  
Magnetic Moments ◽  
Axial Vector ◽  
Mass Splitting ◽  
Energy Functional ◽  
Coupling Constant ◽  
Quark Loop ◽  
Vector Coupling ◽  
Quark Masses ◽  
Axial Vector Coupling

We study translational and spin-isospin symmetry restoration for the two-flavor chiral quark-loop soliton. Instead of a static soliton at rest we consider a boosted and rotating hedgehog soliton. Corrected classical meson fields are obtained by minimizing a corrected energy functional which has been derived by semi-classical methods (variation after projection). We evaluate corrected meson fields in the region 300 MeV ≤ M≤ 600 MeV of constituent quark masses M and compare them with the uncorrected fields. We study the effect of the corrections on various expectation values of nuclear observables such as the root-mean square radius, the axial-vector coupling constant, magnetic moments and the delta-nucleon mass splitting.

UNPOLARIZED NUCLEON STRUCTURE FUNCTIONS IN THE NAMBU-JONA-LASINIO CHIRAL SOLITON MODEL

1996 ◽  
Vol 11 (38) ◽  
pp. 3021-3034 ◽  
Author(s):  
H. WEIGEL ◽  
L. GAMBERG ◽  
H. REINHARDT
Keyword(s):  
Constituent Quark ◽  
Valence Quark ◽  
Parton Model ◽  
Structure Functions ◽  
Nucleon Structure ◽  
Quark Masses ◽  
Model Interpretation ◽  
Chiral Soliton ◽  
Quark Level ◽  
Chiral Soliton Model

We study nucleon structure functions within the bosonized Nambu-Jona-Lasinio model where the nucleon emerges as a chiral soliton. As examples we present the unpolarized structure functions for the νp and [Formula: see text] scattering and discuss the Gottfried sum rule in the valence quark approximation. This approximation is justified for moderate constituent quark masses (~ 400 MeV) as the valence quark level dominates the predictions of nucleon properties. We find that these structure functions are well localized in the interval 0≤x Bj ≤1 permitting a parton model interpretation.

scholarly journals Masses of constituent quarks confined in open bottom hadrons

2014 ◽  
Vol 29 (38) ◽  
pp. 1450202 ◽  
Author(s):  
V. Borka Jovanović ◽  
D. Borka ◽  
P. Jovanović ◽  
J. Milošević ◽  
S. R. Ignjatović
Keyword(s):  
Hyperfine Interaction ◽  
Quark Mass ◽  
Constituent Quark ◽  
Coupling Constants ◽  
Quark Masses ◽  
Fitting Procedure ◽  
Average Color ◽  
Fitting Method ◽  
Hadron Masses ◽  
B Quark

We apply color-spin and flavor-spin quark–quark interactions to the meson and baryon constituent quarks, and calculate constituent quark masses, as well as the coupling constants of these interactions. The main goal of this paper was to determine constituent quark masses from light and open bottom hadron masses, using the fitting method we have developed and clustering of hadron groups. We use color-spin Fermi–Breit (FB) and flavor-spin Glozman–Riska (GR) hyperfine interaction (HFI) to determine constituent quark masses (especially b quark mass). Another aim was to discern between the FB and GR HFI because our previous findings had indicated that both interactions were satisfactory. Our improved fitting procedure of constituent quark masses showed that on average color-spin (FB) HFI yields better fits. The method also shows the way how the constituent quark masses and the strength of the interaction constants appear in different hadron environments.

Constituent-quark masses and SU(3)-breaking in meson decays

1984 ◽  
Vol 154 (2) ◽  
pp. 308-318 ◽  
Author(s):  
Ll. Ametller ◽  
A. Bramon
Keyword(s):  
Constituent Quark ◽  
Meson Decays ◽  
Quark Masses

WEAK LEPTONIC DECAY OF LIGHT AND HEAVY PSEUDOSCALAR MESONS IN A FIELD-THEORETIC QUARK MODEL

1993 ◽  
Vol 08 (29) ◽  
pp. 2775-2783 ◽  
Author(s):  
L. MAHARANA ◽  
A. NATH ◽  
A. R. PANDA
Keyword(s):  
Harmonic Oscillator ◽  
Quark Model ◽  
Constituent Quark ◽  
Leptonic Decay ◽  
Decay Constants ◽  
Quark Masses ◽  
Leptonic Decays ◽  
Pseudoscalar Mesons ◽  
Oscillator Wave Function ◽  
Harmonic Oscillator Wave Function

Weak leptonic decays of light and heavy pseudoscalar mesons are studied in a field-theoretic quark model where the mesons are described by constituent quarks and antiquarks with a particular ansatz and a Harmonic oscillator wave function. With constituent quark masses and Harmonic oscillator radii for mesons as parameters of the model, decay constants are calculated and found as (fπ, fk, fD, fB) = (132 MeV , 161 MeV , 160 MeV , 115 MeV ) indicating a reasonable agreement with the experimental data wherever available. Partial decay widths and branching ratios for kinematically allowed leptonic decay processes are also estimated and compared with the experiments wherever available.

scholarly journals Spectroscopic Properties of Light Baryon

2022 ◽  
Vol 258 ◽  
pp. 03004
Author(s):  
Chandni Menapara ◽  
Ajay Kumar Rai
Keyword(s):  
Quark Model ◽  
Constituent Quark ◽  
Spectroscopic Properties ◽  
Constituent Quark Model ◽  
Hadron Spectroscopy ◽  
Quark Masses ◽  
Regge Trajectories ◽  
Light Baryon ◽  
Experimental Approaches ◽  
Linear Nature

Hadron Spectroscopy provides a realm to study the internal quark dynamics within the hadrons through phenomenological, theoretical as well as experimental approaches. In the present article, an attempt has been made to exploit the nucleon N resonances using a non-relativistic hypercentral Constituent Quark Model (hCQM). The properties are studied based on the linear nature of confining part of the potential. The 1S-5S, 1P-3P, 1D-2D and 1F states mostly with four star labelled resonances are explored again with the separation of charge states using different constituent quark masses. Also, Regge trajectories for some obtained states are plotted for examining the linear nature.

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