AI Article Synopsis
- A precision measurement was conducted on differential cross sections and photon asymmetry for the γp→π0p reaction using advanced detection methods at the Mainz Microtron.
- The experiment utilized a tagged photon beam with a nearly 4π detector setup including the Crystal Ball/TAPS system and a liquid hydrogen target.
- The resulting data enabled a detailed analysis of the energy dependence of specific amplitude components, providing a rigorous test of chiral perturbation theory in its relevant energy range.
Article Abstract
A precision measurement of the differential cross sections dσ/dΩ and the linearly polarized photon asymmetry Σ≡(dσ⊥-dσ∥)/(dσ⊥+dσ∥) for the γp→π0p reaction in the near-threshold region has been performed with a tagged photon beam and almost 4π detector at the Mainz Microtron. The Glasgow-Mainz photon tagging facility along with the Crystal Ball/TAPS multiphoton detector system and a cryogenic liquid hydrogen target were used. These data allowed for a precise determination of the energy dependence of the real parts of the S- and all three P-wave amplitudes for the first time and provide the most stringent test to date of the predictions of chiral perturbation theory and its energy region of agreement with experiment.
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| http://dx.doi.org/10.1103/PhysRevLett.111.062004 | DOI Listing |
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