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- W1940929343 abstract "We give an overview of the physics motivation and evolution of the neutral pion photoproduction measurements in the threshold region conducted in the A2 collaboration at MAMI. The latest two experiments have been performed with the almost 4-pi Crystal Ball detector. The first was with a linearly polarized photon beam and unpolarized liquid-hydrogen target. The data analysis is now complete and the linearly polarized beam asymmetry along with differential cross sections provide the most stringent test to date of the predictions of Chiral Perturbation Theory and its energy region of convergence. More recently a measurement was performed using both circularly polarized photons and a transversely polarized butanol frozen-spin target, with the goal of extracting both the target and beam-target asymmetries. From these we intend to extract pi-N scattering sensitive information for the first time in photo-pion reactions. This will be used to test isospin conservation and further test dynamics of chiral symmetry breaking in QCD as calculated at low energies by Chiral Perturbation Theory." @default.
- W1940929343 created "2016-06-24" @default.
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- W1940929343 date "2011-09-01" @default.
- W1940929343 modified "2023-10-18" @default.
- W1940929343 title "Neutral pion production in the threshold region" @default.
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- W1940929343 doi "https://doi.org/10.1140/epjst/e2011-01487-x" @default.
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