Magnetic moments of<i>L</i>= 1 negative parity<i>N</i>* resonances in different models

He, J.-J.; Dong, Yubing

doi:10.1088/0954-3899/29/12/005

Cited by 6 publications

(6 citation statements)

References 22 publications

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“…As shown in Refs. [40,41], these two models give similar mixing angles for the negative parity resonances and the relevant observables. Here, we adopt the OGE model which has been successfully used to study the helicity amplitudes and decay widths [13] of resonances.…”

Section: B Configuration Mixingmentioning

confidence: 72%

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ηphotoproduction on the proton in a chiral constituent quark approach via a one-gluon-exchange model

Saghai

2008

Phys. Rev. C

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A formalism based on a chiral quark model (χQM) approach complemented with a one-gluon exchange model, to take into account the breakdown of the SU (6) ⊗ O(3) symmetry, is presented.The configuration mixing of wave functions for nucleon and resonances are derived. With few adjustable parameters, differential cross-section and polarized beam asymmetry for the γ p → η p process are calculated and successfully compared with the data in the centre-of-mass energy range from threshold up to 2 GeV. The known resonances S 11 (1535), S 11 (1650), P 13 (1720), D 13 (1520), and F 15 (1680), as well as two new S 11 and D 15 resonances are found to be dominant in the reaction mechanism. Besides, connections among the scattering amplitudes of the χQM approach and the helicity amplitudes, as well as decay widths of resonances are established. Possible contributions from the so-called "missing resonances" are investigated and found to be negligible.

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Section: B Configuration Mixingmentioning

confidence: 72%

“…The breakdown of the symmetry arises from the additional terms. Given that the configuration mixing is mainly produced by the spin-and flavor-dependent parts of Hamiltonian [40], here we use a simple method to deal with the confinement terms in Refs. [19,37], where three constants E 0 , Ω, and ∆ are introduced.…”

Section: B Configuration Mixingmentioning

confidence: 99%

ηphotoproduction on the proton in a chiral constituent quark approach via a one-gluon-exchange model

Saghai

2008

Phys. Rev. C

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“…For a compilation of the results obtained by using mixing angles given by different models we refer the reader to, for example, Refs. [70][71][72].…”

Section: Magnetic Moment Of Baryons In the Quark Modelmentioning

confidence: 99%

Magnetic moments of the low-lying $$\tfrac{1} {2}^ -$$ octet baryon resonances

et al. 2013

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The magnetic moments of the negative parity octet resonances with spin 1 2 : N * (1535), N * (1650), Σ * (1620), and Ξ * (1690) have been calculated within the framework of the chiral constituent quark model. In this approach, the presence of the polarized qq pairs (or the meson cloud, in other words) is considered by using the Lagrangian for Goldstone boson emission from the constituent quarks. Further, the explicit contributions coming from the spin and orbital angular momentum, including the effects of the configurations mixing between the states with different spins, are obtained. The motivation for these calculations comes from the recent interest in experimental measurement of the magnetic moment of the S 11 (1535) resonance and of similar calculations being done within lattice quantum chromodynamics approaches. Our results can be compared with those expected to come from these sources.

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“…[14] The mixing angle θ is a useful physical property to distinguish quark models such as the one-gluon exchange model, one-pion-exchange model and so on. [28] In Fig. 5, we therefore give G n E with both mixing angles in OGE and OPE to display the crucial role of the mixing angle θ.…”

Section: Electromagnetic Form Factors and Magnetic Moments Of The S 1...mentioning

confidence: 99%

Electromagnetic Properties of S ₁₁ States in a Light Cone Quark Model

Dong

2006

Commun. Theor. Phys.

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Using relativistic spin-flavor wave functions of a Lorentz-covariant light cone quark model, we calculate the electromagnetic form factors of two S11 resonances, N(1535) and N(1650), and the helicity amplitudes A1/2 and S1/2 for electroexcitation of the S11 resonances from the nucleon. The electromagnetic form factors of these S11 resonances are found to be similar to those of the nucleon in shape, while the charge form factor of neutral N(1650) is nearly zero. The relative peak height of the S11 charge form factors is controlled by the mixing angle common to both resonance wave functions. As in most quark models, there is a systematic overestimate of A1/2p in both N(1535) and N(1650) cases at the photon point. A sizeable S1/2 for all cases is produced as suggested by experiments.

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Magnetic moments ofL= 1 negative parityN* resonances in different models

Cited by 6 publications

References 22 publications

ηphotoproduction on the proton in a chiral constituent quark approach via a one-gluon-exchange model

ηphotoproduction on the proton in a chiral constituent quark approach via a one-gluon-exchange model

Magnetic moments of the low-lying $$\tfrac{1} {2}^ -$$ octet baryon resonances

Electromagnetic Properties of S ₁₁ States in a Light Cone Quark Model

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Magnetic moments ofL= 1 negative parityN* resonances in different models

Cited by 6 publications

References 22 publications

ηphotoproduction on the proton in a chiral constituent quark approach via a one-gluon-exchange model

ηphotoproduction on the proton in a chiral constituent quark approach via a one-gluon-exchange model

Magnetic moments of the low-lying $$\tfrac{1} {2}^ -$$ octet baryon resonances

Electromagnetic Properties of S 11 States in a Light Cone Quark Model

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Product

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Electromagnetic Properties of S ₁₁ States in a Light Cone Quark Model