It is found that the finite-energy spectral properties of the one-dimensional
Hubbard model are controlled by the scattering of charged η-spin-zero
2ν-holon composite objects, spin-zero 2ν-spinon composite objects, and
charged η-spin-less and spin-less objects, rather than by the scattering
of independent η-spin 1/2 holons and spin 1/2 spinons. Here ν=1,2,.... The corresponding S matrix is calculated and its relation to the
spectral properties is clarified.Comment: 8 pages, no figure