Study of non-strange baryon resonances with meson photoproduction

Krusche, B.; Schadmand, S.

doi:10.1016/s0146-6410(03)90005-6

Cited by 179 publications

(204 citation statements)

References 310 publications

(636 reference statements)

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“…As discussed, e.g., in Ref. [49], none of the existing models could reproduce the observed nodal structure of this observable for incident photon energies below 800 MeV. Tiator and collaborators [66] showed, with a truncated multipole analysis, that the measured target asymmetry forces a large and strongly varying phase between the s-wave E 0+ multipole and the d-wave E 2− , M 2− multipoles.…”

Section: Photoproduction Of η-Mesons Off Nucleonsmentioning

confidence: 96%

“…(2.1), this indicated that either the isoscalar or the isovector photons dominate the reaction. The small cross sections reported for the coherent γd → dη reaction [51,52,63] established the dominance of the isovector part (see [49] for details).…”

Section: Coherent Production 321 Single η-Production Off 3 He and 7mentioning

confidence: 99%

“…Bottom left: ratios of quasi-free neutron and proton cross sections for data and models shown in the earlier panels. Angular distributions for the γp → pη reaction have been reported in [30,31,32,33,34,35,47,37,36,48,38] (we have omitted some older references that can be found in [49]). Typical examples that demonstrate the level of agreement between the experiments are shown in Fig.…”

Section: Photoproduction Of η-Mesons Off Nucleonsmentioning

confidence: 99%

“…The σ n /σ p ratio can be translated into one for the magnitudes of the electromagnetic couplings of the S 11 state to protons and neutrons (see [49] for details): |A n 1/2 |/|A p 1/2 | ≈ 0.8. This means, according to Eq.…”

Section: Photoproduction Of η-Mesons Off Nucleonsmentioning

confidence: 99%

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Production of η and η′ mesons on nucleons and nuclei

Krusche¹,

Wilkin²

2015

Progress in Particle and Nuclear Physics

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The production of η and η mesons in photon-and hadron-induced reactions on free and quasifree nucleons and on nuclei is reviewed. The extensive database on γN → ηN , for both proton and neutron targets, is described in detail and its implications for the search for N resonances much heavier than the dominant S 11 (1535) discussed. Though less is currently known about the production of the η or of ηπ pairs, these also offer tantalizing prospects in the search for the missing isobars. The more limited data available on pion-induced production are still necessary ingredients in the partial wave analysis discussed.The production of the η-meson in pp and pn collisions shows once again the strong influence of the S 11 (1535) isobar, which is in contrast to the relatively weak behaviour seen near threshold for η production. This difference is reflected in the important final state interaction effects of the η in nuclei that may even lead to this meson being "bound" in some systems. The evidence for this is reviewed for both γA and pA collisions. The inclusive photoproduction of η, η , and ηπ pairs from nuclei provides further information regarding the production mechanism and the interaction of the η and η with nuclei and the ηπ pairs may even allow access to low mass ηA systems that are forbidden in direct single-meson photoproduction.

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Section: Photoproduction Of η-Mesons Off Nucleonsmentioning

confidence: 96%

Section: Coherent Production 321 Single η-Production Off 3 He and 7mentioning

confidence: 99%

Section: Photoproduction Of η-Mesons Off Nucleonsmentioning

confidence: 99%

Section: Photoproduction Of η-Mesons Off Nucleonsmentioning

confidence: 99%

See 2 more Smart Citations

Production of η and η′ mesons on nucleons and nuclei

Krusche¹,

Wilkin²

2015

Progress in Particle and Nuclear Physics

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“…It has also been one of the challenges to understanding strong QCD [1,2] where the connection between the nucleon internal degrees of freedom and nuclear medium effects has been a key issue. Historically, nucleon resonances have been among the richest sources of information on low energy QCD phenomena.…”

Section: Introductionmentioning

confidence: 99%

A quark model framework for the study of nuclear medium effects

Zhao¹,

Al-Khalili²,

Johnson³

2004

J. Phys. G: Nucl. Part. Phys.

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A quark-model framework for studying nuclear medium effects on nucleon resonances is described and applied here to pion photoproduction on the deuteron, which is the simplest composite nucleon system and serves as a first test case. Pion photoproduction on nuclei is discussed within a chiral constituent quark model in which the quark degrees of freedom are explicitly introduced through an effective chiral Lagrangian for the quark-pseudoscalar-meson coupling. The advantage of this model is that a complete set of nucleon resonances can be systematically included with a limited number of parameters. Also, the systematic description of the nucleon and its resonances at quark level allows us to self-consistently relate the nuclear medium's influence on the baryon properties to the intrinsic dynamic aspects of the baryons. As the simplest composite nucleus, the deuteron represents the first application of this effective theory for meson photoproduction on light nuclei. The influence of the medium on the transition operators for a free nucleon is investigated in the Delta resonance region. No evidence is found for a change of the Delta properties in the pion photoproduction reaction on the deuteron since the nuclear medium here involves just one other nucleon and the low binding energy implies low nuclear density. However, we show that the reaction mechanism is in principle sensitive to changes of Delta properties that would be produced by the denser nuclear medium of heavier nuclei through the modification of the quark model parameters.

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Meson photoproduction on the nucleon with polarized photons

D’Angelo

Bartalini

Bellini

et al. 2007

The IVth International Conference on Quarks and Nuclear Physics

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Abstract. Beam asymmetry and differential cross-section for the reaction γp → ηp were measured from production threshold to 1500 MeV photon laboratory energy. The two dominant neutral decay modes of the η-meson, η → 2γ and η → 3π 0 , were analyzed. The full set of measurements is in good agreement with previously published results. Our data were compared with three models. They all fit satisfactorily the results but their respective resonance contributions are quite different. The possible photoexcitation of a narrow state N (1670) was investigated and no evidence was found.PACS. 13.60.Le Meson production -13.88.+e Polarization in interactions and scattering -25.20.Lj Photoproduction reactions

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Study of non-strange baryon resonances with meson photoproduction

Cited by 179 publications

References 310 publications

Production of η and η′ mesons on nucleons and nuclei

Production of η and η′ mesons on nucleons and nuclei

A quark model framework for the study of nuclear medium effects

Meson photoproduction on the nucleon with polarized photons

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