Measurement of the beam asymmetry in η photoproduction off the proton

Elsner, D.; Anisovich, A. V.; Anton, G.; Bacelar, J. C. S.; Bantes, B.; Bartholomy, O.; Bayadilov, D.; Beck, R.; Beloglazov, Y. A.; Bogendorfer, R.; Castelijns, R.; Credé, V.; Dutz, H.; Ehmanns, A.; Essig, K.; Ewald, R.; Fabry, I.; Flemming, H.; Fornet-Ponse, K.; Fuchs, Markus; Funke, Ch.; Gothe, R.; Gregor, R.; Gridnev, A.; Gutz, E.; Höffgen, S.; Hoffmeister, P.; Horn, I.; Hößl, J.; Jaeglé, I.; Junkersfeld, J.; Kalinowsky, H.; Kammer, S.; Kleber, V.; Klein, Frank; Клейн, Ф.; Klempt, E.; Koch, H.; Konrad, M.; Kopf, B.; Kotulla, M.; Krusche, B.; Lang, Μ.; Langheinrich, J.; Löhner, H.; Lopatin, I.; Lotz, J.; Lugert, S.; Matthäy, H.; Menze, D.; Mertens, T.; Messchendorp, J. G.; Metag, V.; Morales, C. Morales; Nanova, M.; Nikonov, V. A.; Novinski, D.; Novotny, R.; Ostrick, M.; Pant, L. M.; Pee, H. van; Pfeiffer, M.; Radkov, A.; Sarantsev, A.; Schadmand, S.; Schmidt, Ch.; Schmieden, H.; Schoch, B.; Shende, S.; Suft, G.; Süle, A.; Sumachev, V. V.; Szczepanek, T.; Thoma, U.; Trnka, D.; Walther, Dirk; Weinheimer, C.; Wendel, Ch.

doi:10.1140/epja/i2007-10447-9

Cited by 99 publications

(68 citation statements)

References 39 publications

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“…8. All the experimental results for the γp → pη reaction [35,82,83] are in reasonable agreement; for γn → nη only results from the GRAAL experiment [64] are so far available. We have already discussed above the strong contribution of the S 11 (1535) -D 13 (1520) interference to the beam asymmetry, which is responsible for the fast rise of the A 0 coefficient from threshold.…”

Section: Photoproduction Of η-Mesons Off Nucleonsmentioning

confidence: 83%

“…The fact that the fits (with many free parameters) can describe the data does not of course guarantee that the right physics is included in the models. An instructive example of this is given in [83]. The measured beam asymmetries around W ≈ 1.8 GeV are compared in Fig.…”

Section: Photoproduction Of η-Mesons Off Nucleonsmentioning

confidence: 98%

“…These data have gone into the model analyses discussed above. They have been measured mainly at the GRAAL facility [35,64,82] and at ELSA [83]. The primary results are summarized in Fig.…”

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: 83%

Section: Photoproduction Of η-Mesons Off Nucleonsmentioning

confidence: 98%

See 1 more Smart Citation

Production of η and η′ mesons on nucleons and nuclei

Krusche¹,

Wilkin²

2015

Progress in Particle and Nuclear Physics

Self Cite

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“…For the measurements targets of 12 C, 40 Ca, 93 Nb and 208 Pb were used. A more detailed description of the detector setup and the running conditions has been given in [9,10]. The detector acceptance was determined by Monte Carlo simulations using the GEANT3 package, including all features of the detector system, trigger conditions and all cuts for particle identification.…”

Section: Methodsmentioning

confidence: 99%

In-medium Properties of theη′-Meson from Photonuclear Reactions

Nanova

2012

EPJ Web of Conferences

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Abstract. Investigations of in-medium properties of the η ′ -meson are presented. The photoproduction of η ′ -mesons off 12 C, 40 Ca, 93 Nb and 208 Pb nuclei has been measured with the Crystal Barrel/TAPS detector system at the ELSA accelerator in Bonn. Comparing the meson yield per nucleon within a nucleus to the yield on a free nucleon, information on the absorption of the meson through inelastic channels in the nuclear medium and the related in-medium width of the meson is provided. From this so called transparency ratio we found the in-medium width of the η ′ -meson to be of the order of 20 MeV. The measured width is sufficently narrow to encourage a search for η ′ mesic states. Recent results on the momentum distribution of the transparency ratio and in-medium width of the η ′ -meson are presented and discussed.

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“…The ω and η mesons are reconstructed in the ω → π 0 γ → 3γ and η → π 0 π 0 η → 6γ decay channels, respectively. A more detailed description of the detector setup and the running conditions has been given in [14][15][16][17].…”

Section: Experimental Approaches For Determining the Meson-nucleus Opmentioning

confidence: 99%

Experimental results on theω- andη′-nucleus potential - on the way to mesic states

Nanova¹

2015

EPJ Web of Conferences

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Abstract. Different experimental approaches to determine the meson-nucleus optical potential are discussed. The experiments have been performed with the Crystal Barrel/TAPS detector system at the ELSA accelerator in Bonn and the Crystal Ball/TAPS at the MAMI accelerator in Mainz. Experimental results about the real and imaginary part of the η -and ω-nucleus optical potential are presented. The imaginary part of the meson-nucleus optical potential is determined from the in-medium width of the meson by the measurement of the transparency ratio. Information on the real part of the optical potential is deduced from measurements of the excitation function and momentum distribution which are sensitive to the sign and depth of the potential. The results are discussed and compared to theoretical predictions. The data for both mesons are consistent with a weakly attractive potential. The formation and population of ω-nucleus and η -nucleus bound states is additionally discussed.

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Measurement of the beam asymmetry in η photoproduction off the proton

Cited by 99 publications

References 39 publications

Production of η and η′ mesons on nucleons and nuclei

Production of η and η′ mesons on nucleons and nuclei

In-medium Properties of theη′-Meson from Photonuclear Reactions

Experimental results on theω- andη′-nucleus potential - on the way to mesic states

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