Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-02-11
Eur.Phys.J.A41:71-84,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 17 figures, typos in table 3 corrected; accepted for publication in Eur. Phys. J. A
Scientific paper
10.1140/epja/i2009-10771-0
A Regge model with absorptive corrections is employed in a global analysis of the world data on the reactions gamma p -> pi0 p and gamma n -> pi0 n for photon energies from 3 to 18 GeV. 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 GeV^2 allows us to determine the non-resonant part of the reaction amplitude reliably. The model amplitude is then used to predict observables for photon energies below 3 GeV. 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 pi0 radiative decay width via the Primakoff effect from the reaction gamma p -> pi0 p are explored.
Haidenbauer Johann
Krewald Siegfried
Meißner Ulf-G.
Sibirtsev Alexander
Thomas Anthony W.
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