Abstract
Three different methods for the determination of the pion nucleon coupling constant ƒ 2 from single pion photoproduction data in the first resonance region are discussed. They all yield results for ƒ 2 compatible with each other and with the results from investigations of πN and NN scattering. The determination from π + data alone (independent of πN phase shifts) yield the value ƒ 2 = (79.2 ± 3.9) × 10 −3 , while the determination using the Bonn multipole analysis (dependent on πN phase shifts) yields ƒ 2 = (76.9 ± 4.5) × 10 −3 .
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