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Multiparticle States with Spin-Independent Poincaré Transformation Properties
Phys. Rev. D 3, 1468 – Published 15 March, 1971
DOI: https://doi.org/10.1103/PhysRevD.3.1468
Abstract
We consider systems of noninteracting particles. We define, in terms of standard on-mass-shell states and direct-product helicity states, three complete classes of multiparticle states with spin-independent Poincaré transformation properties. No auxiliary spin group is used, and the new "scalar spin" state labels, which are eigenvalues of generalized covariant helicity operators, have a direct physical interpretation in terms of single-particle quantum numbers. In the two-particle case we compare our states with Jacob and Wick's c.m. angular momentum states.
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