Coupled-channel analysis of pion- and eta-electroproduction with the Jülich-Bonn-Washington model

Mai, Maxim; Döring, Michael; Granados, Carlos; Haberzettl, Helmut; Hergenrather, Jackson; Meißner, Ulf-G.; Rönchen, Deborah; Strakovsky, Igor; Workman, Ron

doi:10.48550/arxiv.2111.04774

Cited by 5 publications

(17 citation statements)

References 126 publications

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“…In this context, the electroproduction fits of Refs. [62,63] were carried out with up to eight radically different fit strategies and parameter starting points, leading to a better exploration of different local minima in parameter space. Our current effort to estimate uncertainties goes in the same direction, but the data base in this study is much larger and more heterogeneous.…”

Section: Uncertainty Estimationmentioning

confidence: 99%

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Light baryon resonances from a coupled-channel study including $$\mathbf {K\Sigma }$$ photoproduction

et al. 2022

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The Jülich-Bonn dynamical coupled-channel approach is extended to include $$K\Sigma $$ K Σ photoproduction off the proton. Differential cross section and (double) polarization data for $$K^+\Sigma ^0$$ K + Σ 0 and $$K^0\Sigma ^+$$ K 0 Σ + are analysed simultaneously with the pion- and photon-induced production of $$\pi N$$ π N , $$\eta N$$ η N , $$K\Lambda $$ K Λ , and $$K\Sigma $$ K Σ final states, totaling almost 72,000 data points for center-of-mass energies $$W<2.4$$ W < 2.4 GeV. Based on the fit results the spectrum of $$N^*$$ N ∗ and $$\Delta $$ Δ resonances is extracted in terms of pole positions and residues. We discuss the impact of the $$\gamma p\rightarrow K\Sigma $$ γ p → K Σ channels in detail and investigate the influence of recent polarization data for $$\eta p$$ η p photoproduction.

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Section: Uncertainty Estimationmentioning

confidence: 99%

“…A first-ever coupled-channel analysis of pion and eta electroproduction was performed in Ref. [63]. The present extension of JüBo represents a prerequisite for an analysis of K electroproduction since the JüBo photoproduction amplitude enters the electroproduction potential as a boundary condition at Q 2 = 0.…”

Section: Introductionmentioning

confidence: 99%

Light baryon resonances from a coupled-channel study including $$\mathbf {K\Sigma }$$ photoproduction

et al. 2022

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“…The results on the electrocouplings of the ∆(1232)3/2 + and N (1440)1/2 + resonances have become available from global multi-channel analysis of hadro-, photo-, and electroproduction data for the first time within the coupled-channel approach developed by the Argonne-Osaka group [69]. Recently, the multipoles for πN [70] and ηp [71] electroproduction were extracted from the CLAS data at W < 1.6 GeV and Q 2 < 5 GeV 2 within the coupled-channel approach developed by the Jülich-Bonn-Washington group. The multipoles inferred from the data pave allow for the extraction of the electrocouplings.…”

Section: Nucleon Resonance Electroexcitation Amplitudes From Exclusiv...mentioning

confidence: 99%

Photo- and Electrocouplings of Nucleon Resonances

Mokeev¹,

Carman²

2022

Preprint

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Advances in the exploration of the spectrum and structure of the excited states of the nucleon from experiments with electromagnetic probes on proton targets are presented. Impressive progress has been achieved in the studies of exclusive meson photoproduction in experiments with continuous electron beams and with detectors of almost 4π acceptance. The high-quality data, coupled with the advances in the amplitude analyses of exclusive photo-and hadroproduction data, allow for the observation of several long-awaited new baryon states known previously as the "missing" resonances. Studies of exclusive meson electroproduction in the resonance region with the CLAS detector at JLab have provided the dominant part of the available world information on exclusive meson electroproduction observables. These data offer unique information on the structure of most well-established excited nucleon states in the mass region up to 1.8 GeV in terms of the evolution of their electroexcitation amplitudes with momentum transfer of the virtual photon. We discuss the impact of these results on the insight into the strong interaction dynamics that underlie the generation of the full spectrum of nucleon resonances of distinctively different structure. These results shed light on the emergence of hadron mass, which is one of the most important and still open problems in the Standard Model. The extension of the nucleon resonance studies in the experiments of the 12-GeV era at JLab with the CLAS12 detector are outlined.

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“…The JüBo approach was originally developed to extract the light baryon resonance spectrum from π N scattering data and has been successfully applied in the simultaneous analysis of pion-and photon-induced reactions [40][41][42]. Recently, it was extended to include also electroproduction reactions [43,44]. The scattering amplitude is obtained as the solution of a Lippmann-Schwinger equation respecting theoretical constraints on the S-matrix like unitarity and analyticity.…”

Section: Introductionmentioning

confidence: 99%

Resonances in heavy meson–heavy baryon coupled-channel interactions

et al. 2022

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The interactions of $${\bar{D}}^{(*)} \Lambda _c - {\bar{D}}^{(*)}\Sigma _c^{(*)}$$ D ¯ ( ∗ ) Λ c - D ¯ ( ∗ ) Σ c ( ∗ ) are studied within the framework of a dynamical coupled-channel approach. A series of bound states and resonances with different spin and parity are dynamically generated in the hidden charm sector. Four S-wave bound states are found in the mass range of 4.3–4.5 GeV, close to the pentaquark states observed by LHCb. Two of the states have a spin parity of $$J^P= 1/2^-$$ J P = 1 / 2 - and the other two have $$J^P=3/2^-$$ J P = 3 / 2 - . In addition, several resonances with different spin and parity in higher partial waves are predicted.

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Coupled-channel analysis of pion- and eta-electroproduction with the Jülich-Bonn-Washington model

Cited by 5 publications

References 126 publications

Light baryon resonances from a coupled-channel study including $$\mathbf {K\Sigma }$$ photoproduction

Light baryon resonances from a coupled-channel study including $$\mathbf {K\Sigma }$$ photoproduction

Photo- and Electrocouplings of Nucleon Resonances

Resonances in heavy meson–heavy baryon coupled-channel interactions

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