Eta and kaon production in a chiral quark model

Golli, B.; Širca, S.

doi:10.1140/epja/i2016-16279-6

Cited by 10 publications

(11 citation statements)

References 73 publications

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“…The bag radius R = 0.83 fm corresponding to the cutoff ≈ 550 MeV and value of the pion-decay constant f π reduced to 76 MeV in order to reproduce the πNN coupling constant and other nucleon ground-state properties have been used for all pertinent resonances. In this model we have analyzed the S, P , and D partial waves including all relevant resonances and channels in the low-and intermediate-energy regime [17,18,[35][36][37]. For most of the S and P resonances the parameters determined in the underlying quark model describe consistently the scattering and photoproduction amplitudes, including the production of η and K mesons.…”

Section: A Underlying Quark Modelmentioning

confidence: 99%

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Genuine quark state versus dynamically generated structure for the Roper resonance

et al. 2018

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In view of the recent results of lattice QCD simulation in the P 11 partial wave that has found no clear signal for the three-quark Roper state we investigate a different mechanism for the formation of the Roper resonance in a coupled channel approach including the πN, π , and σ N channels. We fix the pion-baryon vertices in the underlying quark model while the s-wave sigma-baryon interaction is introduced phenomenologically with the coupling strength, the mass, and the width of the σ meson as free parameters. The Laurent-Pietarinen expansion is used to extract the information about the S-matrix pole. The Lippmann-Schwinger equation for the K matrix with a separable kernel is solved to all orders. For sufficiently strong σ NN coupling the kernel becomes singular and a quasibound state emerges at around 1.4 GeV, dominated by the σ N component and reflecting itself in a pole of the S matrix. The alternative mechanism involving a (1s) 2 2s quark resonant state is added to the model and the interplay of the dynamically generated state and the three-quark resonant state is studied. It turns out that for the mass of the three-quark resonant state above 1.6 GeV the mass of the resonance is determined solely by the dynamically generated state, nonetheless, the inclusion of the three-quark resonant state is imperative to reproduce the experimental width and the modulus of the resonance pole.

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Section: A Underlying Quark Modelmentioning

confidence: 99%

“…[17,18] as well as in Ref. [37]. In these calculations we kept m R close to the Breit-Wigner mass and included the σ N channel only at the tree level (ignoring the σ -meson loops).…”

Section: Including a Three-quark Resonant Statementioning

confidence: 99%

Genuine quark state versus dynamically generated structure for the Roper resonance

et al. 2018

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“…In Ref. [33] a chiral quark model is applied to predict amplitudes for eta and kaon production. Single-channel isobar models [34][35][36] and multi-channel K-matrix approaches [37][38][39][40][41][42][43] cover a broad energy range and are able to analyse a large amount of data.…”

Section: Introductionmentioning

confidence: 99%

The impact of $K^{+}\Lambda$ K + Λ photoproduction on the resonance spectrum

Rönchen¹,

Döring

Meißner

2018

Eur. Phys. J. A

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The Jülich-Bonn coupled-channel framework is extended to K + Λ photoproduction. The spectrum of nucleon and ∆ resonances is extracted from simultaneous fits to several pion-induced reactions in addition to pion, eta and K + Λ photoproduction off the proton. More than 40,000 data points up to a center-of-mass energy of E ∼ 2.3 GeV including recently measured double-polarization observables are analyzed. The influence of the γp → K + Λ channel on the extracted resonance parameters and the appearance of states not seen in other channels is investigated. The Jülich-Bonn model includes effective three-body channels and guarantees unitarity and analyticity, which is a prerequisite for a reliable determination of the resonance spectrum in terms of poles and residues.

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“…In our previous analysis we used a typical value of R = 0.83 fm corresponding to the cutoff Λ ≈ 550 MeV. These two parameters describe consistently the scattering and photo-production amplitudes, including the production of η and K mesons [8,21,[23][24][25][26]. In order to reveal the mechanism of ∆(1600) formation we study the evolution of the resonance properties as a function of R (which is inversely proportional to the cutoff momentum) for a large range of its value, keeping in mind that the physically sensible interval should be between 0.6 fm and 1 fm.…”

Section: The Modelmentioning

confidence: 99%

Dynamical generation of resonances in the P33 partial wave

2019

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We investigate the formation of resonances in the P33 partial wave with the emphasis on possible emergence of dynamically generated quasi-bound states as a consequence of a strong p-wave pion attractive interaction in this partial wave, as well as their possible interaction with the genuine quark excited states. By using the Laurent-Pietarinen expansion we follow the evolution of the S-matrix poles in the complex energy plane as a function of the interaction strength. Already without introducing a genuine quark resonant state, two physically interesting resonances emerge with pole masses around 1200 MeV and 1400 MeV, with the dominant πN and π∆ component, respectively. The added genuine resonant state in the (1s) 3 quark configuration mixes with the lower dynamically generated resonance forming the physical ∆(1232) resonance, and pushes the second dynamical resonance to around 1500 MeV, which allows it to be identified with the ∆(1600) resonance. Adding a second resonant state with one quark promoted to the 2s orbit generates another pole whose evolution remains well separated from the lower two poles. We calculate the helicity amplitudes at the pole and suggest that their Q 2 dependence could be a decisive test to discriminate between different models of the ∆(1600) resonance.

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Eta and kaon production in a chiral quark model

Cited by 10 publications

References 73 publications

Genuine quark state versus dynamically generated structure for the Roper resonance

Genuine quark state versus dynamically generated structure for the Roper resonance

The impact of $K^{+}\Lambda$ K + Λ photoproduction on the resonance spectrum

Dynamical generation of resonances in the P33 partial wave

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