Neutral-pion photoproduction off protons in the energy range 0.3 GeV |
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| Authors: | Bartholomy O,Credé V,van Pee H,Anisovich A V,Anton G,Bantes R,Beloglazov Yu,Bogendörfer R,Castelijns R,Ehmanns A,Ernst J,Fabry I,Flemming H,Fösel A,Freiesleben H,Fuchs M,Funke Ch,Gothe R,Gridnev A,Gutz E,Höffgen S K,Horn I,Hössl J,Joosten R,Junkersfeld J,Kalinowsky H,Klein F,Klempt E,Koch H,Konrad M,Kopf B,Krusche B,Langheinrich J,Löhner H,Lopatin I,Lotz J,Matthäy H,Menze D,Messchendorp J,Morales C,Novinski D,Ostrick M,Radkov A,Reinnarth J,Sarantsev A V,Schadmand S,Schmidt Ch,Schmieden H,Schoch B,Suft G,Sumachev V,Szczepanek T,Thoma U,Walther D,Weinheimer Ch CB-ELSA |
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| Affiliation: | Helmholtz-Institut für Strahlen- und Kernphysik, Universit?t Bonn, Nussallee 14-16, D-53115 Bonn, Germany. |
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| Abstract: | Single pi(0) photoproduction has been studied with the CB-ELSA experiment at Bonn using tagged photon energies between 0.3 and 3.0 GeV. The experimental setup covers a very large solid angle of approximately 98% of 4pi. Differential cross sections dsigma/dOmega have been measured. Complicated structures in the angular distributions indicate a variety of different resonances being produced in the s channel intermediate state gammap-->N(*)(Delta(*))-->ppi(0). A combined analysis including the data presented in this letter along with other data sets reveals contributions from known resonances and evidence for a new resonance N(2070)D15. |
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