Measurement of the p(γ,π^{0}) cross section at threshold

Differential and absolute cross sections for the reaction p(γ,${\mathrm{\pi }}^0$) have been measured with energy-defined photons in the threshold region (${\mathit{E}}_{\gamma }$=131.4–157.2 MeV). The ${\mathit{E}}_{0+}$ amplitude has been extracted out of the data. The values found are in disagreement with predictions of low-energy theorems.