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Test of amplitude signs in pion photoproduction predicted by the transformation from current to constituent quarks
Authors:FJ Gilman  I Karliner
Institution:Stanford Linear Accelerator Center, Stanford University, Stanford, Calif. 94305, USA
Abstract:The transformation from current to constituent quark basis states is discussed as it applies to relating amplitudes for photon-nucleon decays of baryon resonances. The predictions for the relative signs of pion photoproduction amplitudes through baryon resonances in the 70 L = 1 and 56 L = 2 multiplets are presented and compared with experiment. Theory and experiment are found to be completely, with the pion-nucleom decay amplitudes of resonances in the 70 L = 1 having the signs characteristic of the 3, 3)?(3, 3) rather than (8, 1)?(1, 8) term in the transformation axial-vector charge.
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