LOWER EXCITATION SPECTRUM OF THE NUCLEON AND Δ IN A RELATIVISTIC CHIRAL QUARK MODEL WITH ONE-MESON EXCHANGE FORCES

The contribution due to the chiral meson exchange to the energy levels of the light baryons is studied in the constituent quark model. The effects of different dynamical ingredients are discussed and the results with and without the chiral meson exchange are compared. Our calculation accommodates all confirmed states and indicates that the chiral meson exchange is indeed necessary to resolve some outstanding problems.

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DESCRIPTION OF SU(3) S-WAVE AND P-WAVE BARYONS

Modern Physics Letters A ◽

10.1142/s0217732303010491 ◽

2003 ◽

Vol 18 (02n06) ◽

pp. 362-365

Author(s):

MIKITO FURUICHI ◽

KIYOTAKA SHIMIZU ◽

Sachiko Takeuchi

Keyword(s):

Quark Model ◽

Excited States ◽

Negative Parity ◽

Nucleon Resonance ◽

P Wave ◽

Meson Exchange ◽

Exchange Potential ◽

Chiral Quark Model ◽

S Wave ◽

Quark System

We investigate the structure of the SU(3) octet and decuplet baryons employing a constituent chiral quark model. We study the ground, s-wave and p-wave excited states of the three-quark system with many range gaussian bases. The method, which we employ here, is shown to work quite well in describing the structure of the SU(3) s-wave and p-wave baryons. It is found that the mass differences between positive and negative parity states are well reproduced. It is also found that the pseudoscalar (ps) meson exchange potential plays a very important role in describing the mass of the nucleon resonance N*(1440) (roper). We also discuss how the semirelativistic approach works in the chiral quark model, and how to treat the potential terms in the semirelativistic approach.

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sQq¯q¯ ( q=u , d ; Q=c , b ) tetraquarks in the chiral quark model

Physical Review D ◽

10.1103/physrevd.103.074011 ◽

2021 ◽

Vol 103 (7) ◽

Author(s):

Gang Yang ◽

Jialun Ping ◽

Jorge Segovia

Keyword(s):

Quark Model ◽

Chiral Quark Model

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The Genuine Resonance of Full-Charm Tetraquarks

Universe ◽

10.3390/universe7050155 ◽

2021 ◽

Vol 7 (5) ◽

pp. 155

Author(s):

Xiaoyun Chen

Keyword(s):

Quark Model ◽

Bound States ◽

Expansion Method ◽

Chiral Quark Model ◽

Stabilization Method ◽

Scaling Method ◽

Resonance States ◽

Gaussian Expansion Method ◽

Color Structure ◽

Quantum Numbers

In this work, the genuine resonance states of full-charm tetraquark systems with quantum numbers JPC=0++,1+−,2++ are searched in a nonrelativistic chiral quark model with the help of the Gaussian Expansion Method. In this calculation, two structures, meson-meson and diquark–antidiquark, as well as their mixing with all possible color-spin configurations, are considered. The results show that no bound states can be formed. However, resonances are possible because of the color structure. The genuine resonances are identified by the stabilization method (real scaling method). Several resonances for the full-charm system are proposed, and some of them are reasonable candidates for the full-charm states recently reported by LHCb.

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