Photoproduction of η-mesons off protons

Bartholomy, O. and Bogendoerfer, R. and Crede, V. and Fabry, I. and Anisovich, A. V. and Anton, G. and Bantes, R. and Beloglazov, Y. A. and Castelijns, R. and Ehmanns, A. and Ernst, J. and Flemming, H. and Foesel, A. and Fuchs, M. and Funke, Ch. and Gothe, R. and Gridnev, A. B. and Gutz, E. and Hoeffgen, S. and Horn, I. and Hoebl, J. and Junkersfeld, J. and Kalinowsky, H. and Klein, F. and Klempt, E. and Koch, H. and Konrad, M. and Kopf, B. and Krusche, B. and Langheinrich, J. and Loehner, H. and Lopatin, I. V. and Lotz, J. and Matthaey, H. and Menze, D. and Messchendorp, J. and Nikonov, V. A. and Novinski, D. V. and Ostrick, M. and Van Pee, H. and Radkov, A. K. and Sarantsev, A. V. and Schadmand, S. and Schmidt, C. and Schmieden, H. and Schoch, B. and Suft, G. and Sumachev, V. V. and Szczepanek, T. and Thoma, U. and Walther, D. and Weinheimer, Ch.. (2007) Photoproduction of η-mesons off protons. The European physical journal. A, Hadrons and nuclei, Vol. 33, H. 2. pp. 133-146.

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Official URL: http://edoc.unibas.ch/dok/A5261928

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Photoproduction of eta -mesons was studied with the Crystal-Barrel detector at ELSA for photon energies in the range from 0.75 to 3GeV. Total and differential cross-sections are presented. The eta mesons are detected in two decay modes, in eta -< 2 gamma and in eta -< 3 pi(0) -< 6 gamma . The cross-sections vary slowly as functions of energy and eta production angle suggesting that only few resonances make significant contributions to the cross-section. For photon energies above 1.5GeV, the differential cross-sections show a strong forward peak due to meson exchanges in the t channel. A comparison of the eta-hotoproduction cross-sections with SAID and MAID as well as with a partial-wave analysis performed on our data in combination with other data sets shows good agreement. The Bonn-Gatchina partial-wave analysis suggests that the largest contribution to eta photoproduction for energies below 3GeV proceeds via three resonances, the well-known N(1535)S-11 , via N(1720)P-13 , and a newly suggested N(2070)D-15 .
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Note:Variant title: Photoproduction of eta-mesons off protons -- Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:26
Deposited On:22 Mar 2012 13:55

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