Phys. Rev. Lett.
94,
012003
(2005)
[5 pages]
Neutral-PionPhotoproduction off Protons in the Energy Range 0.3 GeV<Eγ<3 GeV
O. Bartholomy et al.
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O. Bartholomy1, V. Credé1,*, H. van Pee1,†, A. V. Anisovich1,2, G. Anton3, R. Bantes4, Yu. Beloglazov2, R. Bogendörfer3, R. Castelijns5, A. Ehmanns1, J. Ernst1, I. Fabry1, H. Flemming6, A. Fösel3, H. Freiesleben7, M. Fuchs1, Ch. Funke1, R. Gothe4,§, A. Gridnev2, E. Gutz1, S. K. Höffgen4, I. Horn1, J. Hößl3, R. Joosten1, J. Junkersfeld1, H. Kalinowsky1, F. Klein4, E. Klempt1, H. Koch6, M. Konrad4, B. Kopf6,7, B. Krusche8, J. Langheinrich4,§, H. Löhner5, I. Lopatin2, J. Lotz1, H. Matthäy6, D. Menze4, J. Messchendorp9,‡, C. Morales4, D. Novinski2, M. Ostrick4, A. Radkov2, J. Reinnarth1, A. V. Sarantsev1,2, S. Schadmand9, Ch. Schmidt1, H. Schmieden4, B. Schoch4, G. Suft3, V. Sumachev2, T. Szczepanek1, U. Thoma1,†, D. Walther4, and Ch. Weinheimer1 (CB-ELSA
Collaboration)
1Helmholtz-Institut für Strahlen-und Kernphysik, Universität Bonn, Nußallee 14-16,D-53115 Bonn, Germany 2Petersburg NuclearPhysics Institute, Gatchina, St. Petersburg, 188350, Russia 3Physikalisches Institut, Universität Erlangen,Erwin-Rommel-Straße 1, D-91058 Erlangen, Germany 4PhysikalischesInstitut, Universität Bonn, Nußallee 12, D-53115Bonn, Germany 5Kernfysisch Versneller Instituut,Zernikelaan 25, NL 9747 AA Groningen, The Netherlands 6Institutfür Experimentalphysik I, Ruhr-Universität Bochum,Universitätsstraße 150, D-44780 Bochum, Germany 7Institutfür Kern- und Teilchenphysik, Universität Dresden,Mommsenstraße 13, D-01069 Dresden, Germany 8Institut fürPhysik, Universität Basel, Klingelbergstraße 82,CH-4056 Basel, Switzerland 9II. Physikalisches Institut, UniversitätGießen, Heinrich-Buff-Ring 16, D-35392 Gießen, Germany
Received 14 July 2004; published 14 January 2005
Single π0 photoproductionhas been studied with the CB-ELSA experiment at Bonn using tagged photon energiesbetween 0.3 and 3.0 GeV. The experimental setup covers a very large solidangle of ∼98% of 4π. Differentialcross sections dσ/dΩ havebeen measured. Complicated structures in the angular distributions indicatea variety of different resonances being produced in the s channelintermediate state γp→N*(Δ*)→pπ0.A combined analysis including the data presented in this letter along withother data sets reveals contributions from known resonances and evidence fora new resonance N(2070)D15.
© 2005 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.012003
DOI:
10.1103/PhysRevLett.94.012003
*Current address: Florida State University, Tallahassee, FL, USA. †Current address: Physikalisches Institut, Universität Gießen, Germany. ‡Current address: Kernfysisch Versneller Instituut, Groningen, Netherlands. §Current address: University of South Carolina, Columbia, SC, USA.
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