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

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

2001-05-17

arxiv.org/abs/nucl-ex/0105010v1

Phys.Rev.Lett. 87 (2001) 232501

Physics

Nuclear Physics

Nuclear Experiment

14 pages Latex including 3 figures and 1 table

Scientific paper

10.1103/PhysRevLett.87.232501

The photon asymmetry in the reaction p(\vec{\gamma},\pi^{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.

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