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A rigorous multipole analysis of the recent gamma p-<pi(0)p cross-section measurement is presented. The data were taken using the photon spectrometer TAPS at the tagged photon beam of the Mainz microtron. The s and p wave multipoles were extracted using minimal model assumptions. The predicted unitary cusp for the s-wave multipole E(0+) due to the two step gamma p-<pi(+)n-<pi(0)p reaction was observed. The results are consistent with one-loop chiral perturbation theory calculations for which three low-energy constants have been determined by a fit to the data. The uncertainties in the analysis and the need for polarization observables are discussed

physical review. c. nuclear physics/physical review. c, nuclear physics

Observation of a unitary cusp in the threshold<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi>p</mml:mi></mml:math>reaction

Observation of a unitary cusp in the thresholdγp→π0preaction