https://doi.org/10.1140/epja/i2009-10771-0
Regular Article - Theoretical Physics
Neutral pion photoproduction at high energies
1
Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) und Bethe Center for Theoretical Physics, Universität Bonn, D-53115, Bonn, Germany
2
Excited Baryon Analysis Center (EBAC), Thomas Jefferson National Accelerator Facility, 23606, Newport News, VA, USA
3
Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425, Jülich, Germany
4
Institute of Advanced Simulations, Forschungszentrum Jülich, D-52425, Jülich, Germany
5
Theory Center, Thomas Jefferson National Accelerator Facility, 12000 Jefferson Ave., 23606, Newport News, VA, USA
6
College of William and Mary, Williamsburg, Williamsburg, 23187, VA, USA
* e-mail: j.haidenbauer@fz-juelich.de
Received:
11
February
2009
Revised:
26
March
2009
Accepted:
30
March
2009
Published online:
6
May
2009
A Regge model with absorptive corrections is employed in a global analysis of the world data on the reactions
p
p and
n
n for photon energies from 3 to 18GeV. In this region resonance contributions are expected to be negligible so that the available experimental information on differential cross-sections and single and double polarization observables at - t
2 GeV2allows us to determine the reaction amplitude reliably. The model amplitude is then used to predict observables for photon energies below 3GeV. A detailed comparison with recent data from the CLAS and CB-ELSA Collaborations in that energy region is presented. Furthermore, the prospects for determining the
radiative decay width via the Primakoff effect from the reaction
p
p are explored.
PACS: 11.55.Jy Regge formalism – / 13.60.Le Meson production – / 13.60.-r Photon and charged-lepton interactions with hadrons – / 25.20.Lj Photoproduction reactions –
© SIF, Springer-Verlag Berlin Heidelberg, 2009