Test of low-energy theorems for p(\vec{gamma},π^{0})p in the threshold region

Abstract

The photon asymmetry in the reaction p(\vecγ,π^{0})p close to threshold has been measured for the first time with the photon spectrometer TAPS using linearly polarized photons from the tagged-photon facility at the Mainz Microtron MAMI. The total and differential cross sections were also measured simultaneously with the photon asymmetry. This allowed determination of the S-wave and all three P-wave amplitudes. The low-energy theorems based on the parameter-free third-order calculations of heavy-baryon chiral perturbation theory for P1 and P2 agree with the experimental values.

14 pages Latex including 3 figures and 1 table

References in corpus (5)

• Chiral symmetry and the reaction $\gamma p\to {\pi }^{0}p$
• Aspects of near threshold neutral pion photoproduction off protons
• Observation of a unitary cusp in the threshold γp -> π^{0}p reaction
• A dispersion theoretical approach to the threshold amplitudes of pion photoproduction
• Light Quark Mass Difference and Isospin Breaking In Electromagnetic Pion Production

Cited by in corpus (47)

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• Light Baryon Spectroscopy
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• Unexpected impact of D waves in low-energy neutral pion photoproduction from the proton and the extraction of multipoles
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