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Phys. Rev. Lett. 94, 012003 (2005) [5 pages]

Neutral-PionPhotoproduction off Protons in the Energy Range 0.3  GeV<Eγ<3  GeV

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O. Bartholomy et al.
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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 γpN*(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
PACS:
14.20.Gk, 13.60.Le