K<sup>+</sup> PHOTOPRODUCTION AT LEPS/SPRING-8

Zegers, R. G. T.

doi:10.1142/9789812705174_0011

Cited by 26 publications

(44 citation statements)

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“…Unlike the double-polarization observables C x and C z , the available data for O x and O z are relatively more accurate, as shown in Figs. [16][17][18][19]. We found that the three models have relatively similar trend in the region where experimental data are sufficiently available.…”

Section: A General Resultsmentioning

confidence: 94%

Extracting the pole and Breit-Wigner properties of nucleon and $Δ$ resonances from the $γN\to KΣ$ photoproduction

Clymton,

Mart

2021

Preprint

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We have developed a covariant isobar model to phenomenologically explain the four possible isospin channels of KΣ photoproduction. To obtain a consistent reaction amplitude, which is free from the lower-spin background problem, we used the consistent electromagnetic and hadronic interactions described in our previous report. We used all available experimental data, including the recent MAMI A2 2018 data obtained for the K 0 Σ + and K 0 Σ 0 isospin channels. By fitting the calculated observables to these data we extract the resonance properties, including their Breit-Wigner and pole parameters. Comparison of the extracted parameters with those listed by the Particle Data Group yields a nice agreement. An extensive comparison of the calculated observables with experimental data is also presented. By using the model we investigated the effects of three different form factors used in the hadronic vertex of each diagram. A brief discussion on the form factors is given.

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Section: A General Resultsmentioning

confidence: 94%

Extracting the pole and Breit-Wigner properties of nucleon and $Δ$ resonances from the $γN\to KΣ$ photoproduction

Clymton,

Mart

2021

Preprint

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“…Recent experiments at JLab-CLAS [1,2], ELSA-SAPHIR [3,4] and Spring-8-LEPS [5,6] are refining our knowledge of associated strangeness photoproduction. High precision differential cross section data for the process γp → K + Λ have been released [1,3,6] covering the region between W ≈ 1.6 GeV and 2.6 GeV in the center-of-mass frame.…”

Section: Introductionmentioning

confidence: 99%

Dynamical coupled-channels approach to hadronic and electromagnetic kaon-hyperon production on the proton

et al. 2006

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A dynamical coupled-channel formalism for processes πN → KY and γN → KY is presented which provides a comprehensive investigation of recent data on the γp → K + Λ reaction. The nonresonant interactions within the subspace KY ⊕ πN are derived from effective Lagrangians, using a unitary transformation method. The calculations of photoproduction amplitudes are simplified by casting the coupled-channel equations into a form such that the empirical γN → πN amplitudes are input and only the parameters associated with the KY channel are determined by performing χ 2 -fits to all of the available data for π − p → K • Λ, K • Σ • and γp → K + Λ. Good agreement between our models and those data are obtained. In the fits to πN → KY channels, most of the parameters are constrained within ±20% of the values given by the Particle Data Group and/or quark model predictions, while for γp → K + Λ parameters, ranges compatible with broken SU (6)⊗ O(3) symmetry are imposed. The main reaction mechanisms in K + Λ photoproduction are singled out and issues related to newly suggested resonances S 11 , P 13 , and D 13 are studied. Results illustrating the importance of using a coupled-channel treatment are reported. Meson cloud effects on the γN → N * transitions are also discussed.

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“…The present work is part of an effort to develop a consistent description of kaon production processes of the type p(γ, K + )Y and p(e, e K + )Y [1][2][3]. Recent data for these processes are due to the CLAS Collaboration at Jefferson Laboratory [4], the LEPS Collaboration at SPring-8 [5], and the SAPHIR Collaboration at ELSA [6]. The abundant amount of new data calls for an adequate theoretical treatment.…”

Section: Introductionmentioning

confidence: 99%

Helicity amplitudes and electromagnetic decays of hyperon resonances

Cauteren

Ryckebusch

Metsch³

et al. 2005

Eur. Phys. J. A

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We present results for the helicity amplitudes of the lowest-lying hyperon resonances Y * , computed within the framework of the Bonn Constituent-Quark model, which is based on the Bethe-Salpeter approach. The seven parameters entering the model were fitted to the best-known baryon masses. Accordingly, the results for the helicity amplitudes are genuine predictions. Some hyperon resonances are seen to couple more strongly to a virtual photon with finite Q 2 than to a real photon. Other Y * 's, such as the S01(1670) Λ-resonance or the S11(1620) Σ-resonance, couple very strongly to real photons. We present a qualitative argument for predicting the behaviour of the helicity asymmetries of baryon resonances at high Q 2 .

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K⁺ PHOTOPRODUCTION AT LEPS/SPRING-8

Cited by 26 publications

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Extracting the pole and Breit-Wigner properties of nucleon and $Δ$ resonances from the $γN\to KΣ$ photoproduction

Extracting the pole and Breit-Wigner properties of nucleon and $Δ$ resonances from the $γN\to KΣ$ photoproduction

Dynamical coupled-channels approach to hadronic and electromagnetic kaon-hyperon production on the proton

Helicity amplitudes and electromagnetic decays of hyperon resonances

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K+ PHOTOPRODUCTION AT LEPS/SPRING-8

Cited by 26 publications

References 0 publications

Extracting the pole and Breit-Wigner properties of nucleon and $Δ$ resonances from the $γN\to KΣ$ photoproduction

Extracting the pole and Breit-Wigner properties of nucleon and $Δ$ resonances from the $γN\to KΣ$ photoproduction

Dynamical coupled-channels approach to hadronic and electromagnetic kaon-hyperon production on the proton

Helicity amplitudes and electromagnetic decays of hyperon resonances

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K⁺ PHOTOPRODUCTION AT LEPS/SPRING-8