scholarly journals Chiral symmetry in an extended constituent quark potential model

2003 ◽  
Vol 575 (1-2) ◽  
pp. 55-65 ◽  
Author(s):  
Weizhen Deng ◽  
Yanrui Liu ◽  
Xiaolin Chen ◽  
Dahai Lu ◽  
Shi-Lin Zhu
Keyword(s):  
Chiral Symmetry ◽  
Potential Model ◽  
Constituent Quark ◽  
Quark Potential

Nucleon Resonances in Nuclei and Quark Levels

1997 ◽  
Vol 06 (01) ◽  
pp. 65-81
Author(s):  
M. M. Giannini ◽  
E. Trovatore
Keyword(s):  
Potential Model ◽  
Constituent Quark ◽  
Constituent Quark Model ◽  
Resonance Excitation ◽  
Excitation Mechanism ◽  
Free Nucleon ◽  
Total Strength ◽  
Nucleon System ◽  
Nucleon Resonances ◽  
Quark Potential

The effect of the nuclear medium on the excitation mechanism of nucleon resonances is investigated in the framework of the constituent quark model (CQM). Calculations of the total strength of the M1 and E1 excitations in a two-nucleon system are performed by means of a two-centre quark potential model in which the intercluster barrier is allowed to vary with the relative distance. The results show that the resonance excitation in the deuteron is not modified with respect to the free nucleon case. In contrast, when the internucleon distance assumes typical nuclear values, the pattern of the quark levels leads to a ~ 10% damping of the D 13 resonance, leaving the Δ excitation unaffected, in agreement with the recent photoabsorption measurements.

scholarly journals Mass of heavy-light mesons in a constituent quark picture with partially restored chiral symmetry

2016 ◽  
Vol 93 (5) ◽  
Author(s):  
Aaron Park ◽  
Philipp Gubler ◽  
Masayasu Harada ◽  
Su Houng Lee ◽  
Chiho Nonaka ◽  
...  
Keyword(s):  
Chiral Symmetry ◽  
Constituent Quark ◽  
Light Mesons

VACUUM STRUCTURE, CHIRAL SYMMETRY BREAKING AND STATIC PROPERTIES OF OCTET AND DECUPLET BARYONS

1996 ◽  
Vol 05 (04) ◽  
pp. 649-667
Author(s):  
A.R. PANDA ◽  
K.C. ROY ◽  
R.K. SAHOO
Keyword(s):  
Chiral Symmetry ◽  
Reasonable Agreement ◽  
Constituent Quark ◽  
Chiral Symmetry Breaking ◽  
Wave Functions ◽  
Static Properties ◽  
Vacuum Structure ◽  
Model Yield ◽  
Quark Field ◽  
Quark Wave Function

The static properties of the octet and decuplet baryons are considered within the framework of a quark model of hadrons where the chiral symmetry is broken dynamically through a nontrivial vacuum structure. The pion and kaon being treated consistently within the model yield to the constituent quark wave function approximately same as the wave functions from the gap equations and thus determine consequently the constituent quark field operators. The model was successfully used earlier to study some hadronic phenomena and here also it estimates the static properties of the octet and decuplet baryons in a unified manner, in reasonable agreement with the available measurements. The only parameter of the model is the harmonic oscillator radius for the baryons. The method is nonperturbative with respect to the equal time algebra for the constituent quark field operators.

Color screening effect in the quark potential model

1993 ◽  
Vol 561 (4) ◽  
pp. 595-606 ◽  
Author(s):  
Zhang Zong-Ye ◽  
Yu You-Wen ◽  
Shen Peng-Nian ◽  
Shen Xiao-Yan ◽  
Dong Yu-Bin
Keyword(s):  
Potential Model ◽  
Screening Effect ◽  
Quark Potential

NONPERTURBATIVE QCD, THE CONSTITUENT QUARK MODEL AND CONFINEMENT

1988 ◽  
Vol 03 (01) ◽  
pp. 203-223 ◽  
Author(s):  
B.H.J. MCKELLAR ◽  
M.D. SCADRON ◽  
R.C. WARNER
Keyword(s):  
Quark Model ◽  
Chiral Symmetry ◽  
Constituent Quark ◽  
Chiral Symmetry Breaking ◽  
Constituent Quark Model ◽  
The Other ◽  
Hadron Structure ◽  
Potential Models ◽  
Dynamical Breaking ◽  
Quark Models

There are currently two major QCD-inspired quark models for hadrons. Nonrelativistic potential models and ultrarelativistic bag models have both had their successes. In this paper we present the case for an alternative quark picture, emphasizing the nonperturbative dynamical breaking of chiral symmetry in QCD. The relativistic constituent quark model which emerges recovers the main results of the other approaches, and also holds better prospects for the calculation of relativistic phenomena, and for the eventual understanding of the interrelations between chiral-symmetry breaking, hadron structure and confinement.

scholarly journals Quarkonium Production: Velocity-Scaling Rules and Long-Distance Matrix Elements

1997 ◽  
Vol 12 (22) ◽  
pp. 3951-3963 ◽  
Author(s):  
Gerhard A. Schuler
Keyword(s):  
Heavy Quark ◽  
Bound States ◽  
Potential Model ◽  
Distance Matrix ◽  
Bound State ◽  
Matrix Elements ◽  
Long Distance ◽  
Quarkonium Production ◽  
Quark Potential ◽  
Colour Octet

The hierarchy of long-distance matrix elements (MEs) for quarkonium production depends on their scaling with the velocity v of the heavy quark in the bound state. Ranges for the velocities in various bound states and uncertainties of colour-singlet MEs are estimated in a quark-potential model. Different possibilities for the scaling with v of the MEs are discussed; they depend on the actual values of v and the QCD scale. As an application, J/ψ polarization in e+e- annihilation is discussed. The first non-perturbative estimates of colour-octet MEs are presented and compared with phenomenological determinations. Finally, various predictions of prompt quarkonium production at LEP are compared.

Sign in / Sign up

Export Citation Format

Share Document