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Neutral pion photoproduction at high energies

Authors:	A?Sibirtsev J?Haidenbauer S?Krewald U?-G?Mei?ner A?W?Thomas

Institution:	1.Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) und Bethe Center for Theoretical Physics,Universit?t Bonn,Bonn,Germany;2.Excited Baryon Analysis Center (EBAC),Thomas Jefferson National Accelerator Facility,Newport News,USA;3.Institut für Kernphysik and Jülich Center for Hadron Physics,Forschungszentrum Jülich,Jülich,Germany;4.Institute of Advanced Simulations,Forschungszentrum Jülich,Jülich,Germany;5.Theory Center,Thomas Jefferson National Accelerator Facility,Newport News,USA;6.College of William and Mary,Williamsburg,Williamsburg,USA

Abstract:	A Regge model with absorptive corrections is employed in a global analysis of the world data on the reactions $\gamma$ p $\rightarrow$ $\pi^{0}_{}$ p and $\gamma$ n $\rightarrow$ $\pi^{0}_{}$ 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 $\leq$ 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 $\pi^{0}_{}$ radiative decay width via the Primakoff effect from the reaction $\gamma$ p $\rightarrow$ $\pi^{0}_{}$ p are explored.

Keywords:	PACS" target="_blank">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
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