On the constituent quark structure

1995 ◽  
Author(s):  
Adam Szczepaniak ◽  
Chueng-Ryong Ji ◽  
Stephen R. Cotanch
Keyword(s):  
Constituent Quark ◽  
Quark Structure

scholarly journals Six-quark structure of d*(2380) in a chiral constituent quark model

2017 ◽  
Vol 96 (1) ◽  
Author(s):  
Qi-Fang Lü ◽  
Fei Huang ◽  
Yu-Bing Dong ◽  
Peng-Nian Shen ◽  
Zong-Ye Zhang
Keyword(s):  
Quark Model ◽  
Constituent Quark ◽  
Constituent Quark Model ◽  
Quark Structure

scholarly journals STRUCTURE OF Λ*(1405) AND THE Λ*-MESON-BARYON COUPLING CONSTANTS

2011 ◽  
Vol 26 (03n04) ◽  
pp. 619-621 ◽  
Author(s):  
C. S. AN ◽  
B. SAGHAI
Keyword(s):  
Quark Model ◽  
Decay Width ◽  
Constituent Quark ◽  
Constituent Quark Model ◽  
Coupling Constants ◽  
Strong Decay ◽  
Quark Structure

Within an extended chiral constituent quark model, three- and five-quark structure of the S01 resonance Λ(1405) is investigated with respect to the coupling constants [Formula: see text] and [Formula: see text]. Our findings corroborate with about 50% of five-quark admixture in the Λ(1405) needed in reproducing the strong decay width, ΓΛ(1405)→(Σπ)°.

THE OZI RULE AND NUCLEONS

1992 ◽  
Vol 01 (03) ◽  
pp. 603-628 ◽  
Author(s):  
HARRY J. LIPKIN
Keyword(s):  
Experimental Evidence ◽  
Constituent Quark ◽  
Magnetic Moments ◽  
Constituent Quark Model ◽  
Higher Order ◽  
Hadron Masses ◽  
Quark Structure ◽  
Step Transition ◽  
Ozi Rule

The title of this lecture series raises two questions: (1) what is the OZI rule? (2) what is a nucleon. In the lectures both questions were addressed in parallel and the material moved back and forth between them. In a written version it seems more appropriate to treat the two questions separately, beginning with trying to understand the structure of the nucleon. Experimental evidence for the symmetry and quark structure of hadrons is reviewed with a historical introduction and updated by presenting constituent quark model relations for hadron masses and magnetic moments. Three definitions of the OZI rule are presented, all of which forbid decays like ϕ → ρπ but making different selection rules for more complicated reactions. All suffer from the higher order paradox that a forbidden process can take place via a two-step transition in which each step is allowed; e.g. [Formula: see text]. No prescription is given for estimating the strength of forbidden processes. The role of cancellations between different higher order diagrams is discussed.

PROTON STATIC PROPERTIES BY USING HYPERCENTRAL CONSTITUENT QUARK MODEL AND ISOSPIN

2009 ◽  
Vol 24 (32) ◽  
pp. 2631-2637 ◽  
Author(s):  
NASRIN SALEHI ◽  
ALI AKBAR RAJABI
Keyword(s):  
Quark Model ◽  
Constituent Quark ◽  
Constituent Quark Model ◽  
Static Properties ◽  
Dependent Potential ◽  
Quark Structure ◽  
Isospin Dependence ◽  
Three Body ◽  
Body Potential ◽  
Better Than

The static properties of protons are useful for understanding the quark structure of the proton. In his work we have introduced the hypercentral constituent quark model and isospin dependent potentials. Here constituent quarks interact with each other via a potential in which we have taken into account the three-body force effect and the standard two-body potential contributions. According to our model the static properties of protons containing u and d quarks are better than the other models and closer to experimental results. The two key ingredients of this improvement are the effective quark–gluon hypercentral potentials, and hyperfine interaction and isospin dependence potential. Recently, Schrödinger equation has been solved by Giannini but we have solved the Dirac equation exact analytically and we have shown that a considerable improvement in the description of the static properties of proton is obtained with an isospin dependent potential and the complete interaction including spin and isospin terms reproduces the position of the quark.

scholarly journals K+Λ(1405) photoproduction at the BGO-OD experiment

2020 ◽  
Vol 241 ◽  
pp. 01014
Author(s):  
Georg Scheluchin ◽  
Stefan Alef ◽  
Patrick Bauer ◽  
Reinhard Beck ◽  
Alessandro Braghieri ◽  
...  
Keyword(s):  
Decay Mode ◽  
Constituent Quark ◽  
Forward Direction ◽  
Magnetic Spectrometer ◽  
Exotic Meson ◽  
Preliminary Results ◽  
Large Aperture ◽  
Quark Structure ◽  
Quark Models

Since the discovery of the Λ(1405), it remains poorly described by conventional constituent quark models, and it is a candidate for having an “exotic” meson-baryon or “penta-quark” structure, similar to states recently reported in the hidden charm sector. The Λ(1405) can be produced in the reaction γp K+Λ(1405). The pure I=0 decay mode into Σ0π0 is prohibited for the mass-overlapping Σ(1385). Combining a large aperture forward magnetic spectrometer and a central BGO crystal calorimeter, the BGO-OD experiment is ideally suited to measure this decay with the K+ in the forward direction. Preliminary results are presented. *Supported by DFG (PN 388979758, 405882627)

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
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