2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/207953The velocity basis of the Poincare group is used in the direct product space of two irreducible unitary representations of the Poincare group. The velocity basis with total angular momentum j will be used for the definition of relativistic Gamow vectors.14 pages; revtexHigh Energy Physics - TheoryMathematical PhysicsQuantum Physicstext