Photoproduction of η and η' mesons off nucleons close to threshold

Borasoy, B.

doi:10.1007/s100500070059

Cited by 15 publications

(26 citation statements)

References 14 publications

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“…They also predicted that effects of higher resonances in the n = 3 shell might be observable in experiment. The dominant role of S 11 (1535) was also suggested by Borasoy with the U(3) baryon chiral perturbation theory [7], and Sibirtsev et al with a hadronic model [8]. Considering the interferences between S 11 (1535) and the background (t channel vector meson exchanges), they gave a reasonable description of the old data.…”

Section: Introductionmentioning

confidence: 67%

η′photoproduction on the nucleon in the quark model

Zhong

Zhao

2011

Phys. Rev. C

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A chiral quark-model approach is adopted to study the γp → η ′ p and γn → η ′ n. Good descriptions of the recent observations from CLAS and CBELSA/TAPS are obtained. Both of the processes are governed by S 11 (1535) and u channel background. Strong evidence of an n = 3 shell resonance D 15 (2080) is found in the reactions, which accounts for the bump-like structure around W = 2.1 GeV observed in the total cross section and excitation functions at very forward angles. The S 11 (1920) seems to be needed in the reactions, with which the total cross section near threshold for the γp → η ′ p is improved slightly. The polarized beam asymmetries show some sensitivities to D 13 (1520), although its effects on the differential cross sections and total cross sections are negligible. There is no obvious evidence of the P-, D 13 -, F-and G-wave resonances with a mass around 2.0 GeV in the reactions.

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Section: Introductionmentioning

confidence: 67%

η′photoproduction on the nucleon in the quark model

Zhong

Zhao

2011

Phys. Rev. C

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“…In both quark model approaches, t-channel vector meson exchange was not included. In an equally good description of the data, Borasoy [8] applied U(3) baryon chiral perturbation theory with Born terms, vector mesons and off-shell contributions from P 11 (1440) and S 11 (1535) resonances.…”

Section: Introductionmentioning

confidence: 99%

Reggeized model forηandη′photoproduction

et al. 2003

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A reggeized model for η and η ′ photoproduction on the nucleon is presented. In this model, t-channel vector meson exchanges are described in terms of Regge trajectories to comply with the correct high energy behavior. We compare this reggeized model with an isobar model (η-MAID), where the t-channel exchanges are described by ρ and ω poles. Both models contain the same resonance contributions, and describe current γp → ηp data up to E lab γ = 2 GeV quite well, but only the reggeized model can be successfully extended to higher energies. For the γp → η ′ p reaction, the reggeized model is found to be able to give a satisfactory description. For the differential cross section data from SAPHIR, we find that the observed linear forward rise in cos θ near E lab γ = 1.6 GeV can be well described by the interference of an S 11 resonance and the Regge trajectory exchanges without any need for an additional P -wave resonance.

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“…Moreover, because of an anomalous gluon component, the structure function of the η ′ meson is different from the one for mesons which are built up from quark-antiquark configurations. In a meson exchange model the intrinsic structure of the η ′ meson enters effectively through the form factors at the ρη ′ γ and ωη ′ γ vertices, which do not necessarily have to be of the standard monopole or dipole type [40][41][42][43][44]. In principle, the form factor at large |t| is given by the meson structure function at short distances and in case of η ′ meson might be defined through its gluon component.…”

Section: Vector Meson Exchange As Production Mechanismmentioning

confidence: 99%

“…The possibility of studying excited baryons which couple to the η ′ meson in the in the reaction γp→η ′ p initiated considerable theoretical activity [40][41][42][43][44][45], in which contributions from a number of resonances were introduced. For example, the approach of Refs.…”

Section: Contributions From Baryon Resonancesmentioning

confidence: 99%

“…Currently experimental and theoretical [40][41][42][43][44][45] studies of the reaction γp→η ′ p are motivated by the possibility to investigate excited baryons coupled to the η ′ meson. Assuming that the resonance production is the dominant contribution, an isobar analysis [37] of the SAPHIR data shows that the η ′ -photoproduction at photon energies 0.9≤E γ ≤2.6 GeV can be described by the coherent excitation of two resonances, S 11 (1897) and P 11 (1986).…”

Section: Introductionmentioning

confidence: 99%

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Photoproduction of ηʹ-mesons from the Proton

Elster¹,

Sibirtsev²,

Krewald³

et al. 2004

AIP Conference Proceedings

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The presently available data for the reaction γp→η ′ p are analyzed in terms of a model in which the dominant production mechanism is the exchange of the vector mesons ω and ρ. To describe the data at photon energies close to the production threshold we introduce a resonance contribution due to the well established S 11 (1535) resonance. Finally we study the contributions due to nucleon exchange to the η ′ photoproduction and find, that those contributions can be seen at large angles in the differential cross section.

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Photoproduction of η and η' mesons off nucleons close to threshold

Cited by 15 publications

References 14 publications

η′photoproduction on the nucleon in the quark model

η′photoproduction on the nucleon in the quark model

Reggeized model forηandη′photoproduction

Photoproduction of ηʹ-mesons from the Proton

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