We discuss and generalize to arbitrary spin the kind of single-particle spin states which have appeared naturally in field theories in the infinite-momentum frame. These states transform simply under the Galilean symmetry group which is important in the infinite-momentum frame, rather than under the rotation group. We also find that the spinors U(P,λ) representing these states are very simple.
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Davison E. Soper (1972) studied this question.
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