Vector transition form factors of the and in the chiral quark–soliton model

Ledwig, Tim; Kim, Hyun-Chul; Goeke, K.

doi:10.1016/j.nuclphysa.2008.08.002

Cited by 14 publications

(25 citation statements)

References 99 publications

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“…where the explicit expressions for the electric densities can be found in Refs. [7,34] with the prefactors of the valence parts replaced by N c − 1. The indices i and p are dummy ones running over i = 1, • • • , 3 and p = 4, • • • 7, respectively.…”

Section: General Formalismmentioning

confidence: 99%

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Electromagnetic form factors of singly heavy baryons in the self-consistent SU(3) chiral quark-soliton model

Kim

2018

Phys. Rev. D

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The self-consistent chiral quark-soliton model is a relativistic pion mean-field approach in the large Nc limit, which describes both light and heavy baryons on an equal footing. In the limit of the infinitely heavy mass of the heavy quark, a heavy baryon can be regarded as Nc − 1 valence quarks bound by the pion mean fields, leaving the heavy quark as a color static source. The structure of the heavy baryon in this scheme is mainly governed by the light-quark degrees of freedom. Based on this framework, we evaluate the electromagnetic form factors of the lowest-lying heavy baryons. The rotational 1/Nc and strange current quark mass corrections in linear order are considered. We discuss the electric charge and magnetic densities of heavy baryons in comparison with those of the nucleons. The results of the electric charge radii of the positive-charged heavy baryons show explicitly that the heavy baryon is a compact object. The electric form factors are presented. The form factor of Σ ++ c is compared with that from a lattice QCD. We also discuss the results of the magnetic form factors. The magnetic moments of the baryon sextet with spin 1/2 and the magnetic radii are compared with other works and the lattice data.

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Section: General Formalismmentioning

confidence: 99%

“…The explicit forms for the magnetic densities can be found in Ref. [7,34] with the prefactors of the valence parts replaced by N c − 1. The matrix elements of the collective operators are explicitly given in Appendix A.…”

Section: General Formalismmentioning

confidence: 99%

Electromagnetic form factors of singly heavy baryons in the self-consistent SU(3) chiral quark-soliton model

Kim

2018

Phys. Rev. D

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“…As discussed already in Ref. [24], the values of these coupling constants should be small because of the generalized Ademollo-Gatto theorem for the electric transition form factor at the zero momentum transfer…”

Section: Resultsmentioning

confidence: 78%

$\Theta ^{+}$, $\Xi ^{*}$, and $\Omega$ coupling constants

Kim¹,

Yang²

2014

Proceedings of XV International Conference on Hadron Spectroscopy — PoS(Hadron 2013)

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“…This parameter is of great importance to determine the coupling constants for the K * N Θ + vertex. 63) For example, if we use the values of c 10 in Refs., 2), 43) the vector coupling constant g K * nΘ (= f K * √ 15c 10 ) yields about 1.86 and 1.95, respectively, whereas the present value produces g K * nΘ = 0.96. We want to mention that the measurement of the Θ + photoproduction prefers smaller values of g K * nΘ .…”

Section: Resultsmentioning

confidence: 99%

Mass Splittings of SU(3) Baryons within a Chiral Soliton Model

Yang¹,

Kim²

2012

Progress of Theoretical Physics

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KoreaConsidering simultaneously isospin and SU(3) flavor symmetry breakings, we investigate the complete mass splittings of SU(3) baryons within a chiral soliton model, a "modelindependent approach" being employed. In linear order several new mass relations are derived, which are mostly generalizations of existing mass formulae. The dynamical quantities appearing in the expressions for the masses are fixed by fitting them to the masses of the baryon octet and those of Ω − and Θ + as input rather than by extracting them from a calculated self-consistent soliton profile. In particular, the consideration of isospin symmetry breaking allows us to use the experimental data of the whole octet baryon masses as input. We predict the masses of the baryon decuplet and antidecuplet without any further adjustable free parameter. In addition, we also obtain the pion-nucleon sigma term which turns out to be ΣπN = 36.4 ± 3.9 MeV. We get the ratio of the current light quark masses R = 58.1 ± 1.3. The present results indicate that the recent experimental data for the Θ + (1524) are compatible with the experimental data of the octet and decuplet masses. * ) the formation of a narrow pK 0 peak with mass of 1538 ± 2 MeV/c 2 and width of Γ = 0.39 ± 0.10 MeV in the K + n → K 0 p reaction with higher statistical significance (6 σ − 8 σ). 10) Moreover, other new positive experiments for the Θ + have been reported. 11), 12), 13), 14) The LEPS collaboration also reported the evidence of the Θ + existence: 15) M Θ = 1.524 ± 0.002 ± 0.003 GeV/c 2 with the statistical significance 5.1 σ. The peak position is shifted by +3 MeV systematically due to the minimum momentum spectator approximation.In addition to the Θ + baryon, the GRAAL experiment 16), 17), 18) has found a new nucleon-like resonance around 1.67 GeV from η photoproduction off the deutron in the neutron channel. The decay width was measured to be around 40 MeV. However, Fermi-motion being effects excluded, this decay width may decrease. 19) References 16), 17), 18) have shown that the resonant structure was not seen in the quasi-free proton channel. Note that this newly found N * resonance is consistent with the theoretical predictions 20), 21) of non-strange exotic baryons. Moreover, the narrow width and its dependence on the initial isospin state are the typical characteristics for the photo-excitation of the non-strange antidecuplet pentaquark. 22), 23) Very recently, a new analysis of the free proton GRAAL data 24), 25), 26), 27), 28) has revealed a resonance structure with a mass around 1685 MeV and width Γ ≤ 15 MeV. However, we have to mention that the results of Ref. 24) do not agree with those of Ref. 29) For a detailed discussion of this discrepancy, we refer to Ref. 25) The CB-ELSA collaboration 30) has also announced an evidence for this newly found N * resonance in line with that of GRAAL. All these experimental facts are consistent with the results for the transition magnetic moments in the χQSM 22), 23) and phenomenological analysis for the non-strange pentaquark bary...

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Vector transition form factors of the and in the chiral quark–soliton model

Cited by 14 publications

References 99 publications

Electromagnetic form factors of singly heavy baryons in the self-consistent SU(3) chiral quark-soliton model

Electromagnetic form factors of singly heavy baryons in the self-consistent SU(3) chiral quark-soliton model

$\Theta ^{+}$, $\Xi ^{*}$, and $\Omega$ coupling constants

Mass Splittings of SU(3) Baryons within a Chiral Soliton Model

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