Photoproduction of η -mesons off protons

Bartholomy, O.; Bogendoerfer, R.; Credé, V.; Fabry, I.; Anisovich, A. V.; Anton, G.; Bantes, R.; Beloglazov, Y. A.; Castelijns, R.; Ehmanns, A.; Ernst, J.; Flemming, H.; Foesel, A.; Fuchs, Markus; Funke, Ch.; Gothe, R.; Gridnev, A.; Gutz, E.; Höeffgen, Stefan K.; Horn, I.; Hoebl, J.; Junkersfeld, J.; Kalinowsky, H.; Klein, Frank; Klempt, E.; Koch, H.; Konrad, M.; Kopf, B.; Krusche, B.; Langheinrich, J.; Loehner, H.; Lopatin, I.; Lotz, J.; Matthaey, H.; Menze, D.; Messchendorp, J. G.; Nikonov, V. A.; Novinski, D.; Ostrick, M.; Pee, H. van; Radkov, A.; Sarantsev, A.; Schadmand, S.; Schmidt, Ch.; Schmieden, H.; Schoch, B.; Suft, G.; Sumachev, V. V.; Szczepanek, T.; Thoma, U.; Walther, Dirk; Weinheimer, C.

doi:10.1140/epja/i2007-10455-9

Cited by 50 publications

(38 citation statements)

References 48 publications

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“…In the case of a free proton target the total cross sections and angular distributions have been studied with very high statistic quality. These results have been published in ELSA [17][18][19] and MAMI [20]. The study of the photoproduction off quasi-free neutrons gained a lot of interest, after the finding of an unexpected narrow structure in the excitation function [16].…”

Section: η-Photoproduction Off Quasi-free Nucleonsmentioning

confidence: 97%

Photoproduction of Mesons on Quasi–Free Nucleons

Keshelashvili

2014

EPJ Web of Conferences

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Abstract. The investigation of excited baryon states is important to understand the underling nature/symmetries of hadronic matter. Historically, the first nucleon excitation experiments have been done using charged pion and kaon secondary beams. Later the antiproton-proton scattering has also been involved. However, since the beginning of the 90's meson photoproduction reactions have been considered as a powerful tool in baryon spectroscopy. In this contribution, we overview our experimental programs conducted at the bremsstrahlung photon beams of the MAMI accelerator in Mainz and the ELSA accelerator in Bonn. The results are differential and total cross sections for photoproduction of light neutral mesons and of meson pairs off quasi-free nucleons bound in the deuteron (and sometimes other light nuclei). The scientific programs of this experiments also include single and double polarization measurements as well.

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Section: η-Photoproduction Off Quasi-free Nucleonsmentioning

confidence: 97%

Photoproduction of Mesons on Quasi–Free Nucleons

Keshelashvili

2014

EPJ Web of Conferences

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“…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 first Crystal Barrel experiment [33,47] used the η → 2γ and η → 3π 0 → 6γ decay channels of the η meson (analyzed by invariant mass after kinematic fitting) but triggered on the recoil proton. This experiment also used the SAID π 0 results for absolute normalization.…”

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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“…Experimental progress has been substantial over the last few years. Total cross sections and angular distributions for p → p and p → p have been studied at ELSA [27][28][29] and at MAMI [30]. Also for these reactions the isospin degree of freedom has moved into the focus.…”

Section: Photoproduction Of Isoscalar Mesons -Andmentioning

confidence: 99%

Latest results from meson photoproduction at ELSA and MAMI

Krusche

2014

EPJ Web of Conferences

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Abstract. Photoproduction of mesons plays a key role for the investigation of the excitation spectrum of the nucleon and thus for our understanding of the strong interaction in the nonperturbative regime. In this contribution we discuss recent results from the experiments at the tagged photon beams of the electron accelerators ELSA in Bonn and MAMI in Mainz. They include the measurement of cross sections and (double) polarization observables for single meson production and production of meson pairs off free protons as well as of quasifree nucleons bound in light nuclei (in particular the deuteron).

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Photoproduction of η -mesons off protons

Cited by 50 publications

References 48 publications

Photoproduction of Mesons on Quasi–Free Nucleons

Photoproduction of Mesons on Quasi–Free Nucleons

Production of η and η′ mesons on nucleons and nuclei

Latest results from meson photoproduction at ELSA and MAMI

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