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 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.

FROM PARTONS TO CONSTITUENT QUARKS

1991 ◽  
Vol 06 (22) ◽  
pp. 3933-3953
Author(s):  
D. INDUMATHI ◽  
M.V.N. MURTHY ◽  
V. RAVINDRAN
Keyword(s):  
Quark Mass ◽  
Constituent Quark ◽  
Mass Parameter ◽  
Equation Of Motion ◽  
Operator Product ◽  
Operator Matrix ◽  
Matrix Elements ◽  
Simple Manner ◽  
Proton Structure ◽  
Constituent Quark Mass

We discuss the moments of the proton structure functions F2(x) and g1(x) via the operator-product formalism. We introduce an effective mass for the quarks through an equation of motion. Making use of this, we show that successive moments of a structure function are related to one another in a simple manner. Specifically, the ratios of successive moments depend only on the square of the mass parameter so introduced, and not on the explicit operator matrix elements themselves. Experimental data on the moments indicate that this mass is around 300 MeV, of the order of the constituent quark mass. We strengthen our results by evaluating the moments in a bag model with massive nonstrange quarks.

Role of constituent quark mass in SM

2008 ◽  
Author(s):  
S. I. Sukhoruchkin ◽  
Sigfrido Boffi ◽  
Claudio Ciofi degli Atti ◽  
Mauro Giannini ◽  
Daniele Treleani
Keyword(s):  
Quark Mass ◽  
Constituent Quark ◽  
Constituent Quark Mass

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.

scholarly journals A MASS SPECTRUM FOR LEPTONS AND QUARKS

1993 ◽  
Vol 08 (16) ◽  
pp. 1519-1526
Author(s):  
GIANPIERO MANGANO ◽  
FRANCESCO SANNINO
Keyword(s):  
Mass Spectrum ◽  
Top Quark ◽  
Quark Mass ◽  
Top Quark Mass ◽  
Quark Masses ◽  
Range Of Values ◽  
Insight Into

A suggestive phenomenological relation is found among the lepton and quark masses which suggests a new insight into the problem of generations and also gives a prediction for the top quark mass in agreement with the range of values which is actually expected.

Sign in / Sign up

Export Citation Format

Share Document