Neutral-pion photoproduction off protons in the energy range 0.3 GeV 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. Afiliación Bartholomy O; Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Nussallee 14-16, D-53115 Bonn, Germany. Phys Rev Lett ; 94(1): 012003, 2005 Jan 14. Article en En | MEDLINE | ID: mdl-15698070

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.