https://doi.org/10.1140/epja/i2006-10160-3
Regular Article - Hadron Physics
Photoproduction of πmesons off protons from the Δ(1232) region to Eγ = 3 GeV
1
Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Germany
2
Department of Physics, Florida State University, Tallahassee, FL, USA
3
Petersburg Nuclear Physics Institute, Gatchina, Russia
4
Physikalisches Institut, Universität Erlangen, Germany
5
Physikalisches Institut, Universität Bonn, Germany
6
Kernfysisch Versneller Instituut, Groningen, The Netherlands
7
Institut für Experimentalphysik I, Universität Bochum, Germany
8
Institut für Physik, Universität Basel, Switzerland
9
II. Physikalisches Institut, Universität Gießen, Germany
* e-mail: klempt@hiskp.uni-bonn.de
Received:
5
December
2006
Accepted:
10
December
2006
Published online:
19
January
2007
Photoproduction of π0-mesons was studied with the Crystal-Barrel detector at ELSA for incident energies from 300MeV to 3GeV. Differential cross-sections dσ/dΩ, dσ/dt, and the total cross-section are presented. For E γ < 3GeV, the angular distributions agree well with the SAID parametrization. At photon energies above 1.5GeV, a strong forward peaking indicates t-channel exchange to be the dominant process. The rapid variations of the cross-section with energy and angle indicate production of resonances. An interpretation of the data within the Bonn-Gatchina partial-wave analysis is briefly discussed.
PACS: 13.30.-a Decays of baryons – / 13.60.Le Meson production – / 14.20.Gk Baryon resonances with S = 0 –
© Società Italiana di Fisica and Springer-Verlag, 2007