Precise measurement of Σ beam asymmetry for positive pion photoproduction on the proton from 550 to 1100 MeV (original) (raw)

S beam asymmetries for p q photoproduction on the proton have been measured in the energy range 550-1100 MeV over a wide angular range. The statistical and systematic errors of the data are much lower than in previous measurements, due to the high polarization of the photon beam and the cylindrical geometry of the 4p detector. Our results confirm the

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