Neutral pion photo-production on the proton up to 1.6 GeV

Neutral pion photo-production on the proton is studied using a unitary isobar model. The model contains Born terms, contributions from vector meson exchanges and nucleon resonances. This model (MAID 2007) is implemented as a part of the MAID program (the MAID program can be accessed from the web page: http://www.kph.uni-mainz.de). We have compared the results obtained from this model with the BONN-ELSA-CB experimental data for differential and total cross section. Comparison is carried out for photon energy range of 0.3 - 1.6 Gev. We also have investigated the role of different nucleon resonances in differential cross section in this model.