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The kinematic-singularity structure of helicity amplitudes for Compton scattering from arbitrary-spin hadron targets is obtained by an analysis based on the crossing relations. Explicit formulas are given for a complete set of amplitudes free of kinematic singularities and zeros in both variables. These amplitudes are, however, subject to constraint conditions at special points. The constraints are not studied here.
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Daniel Z. Freedman (1968) studied this question.
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