Internal states in the pion static model

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Abstract
Methods for performing accurate computations of eigenvalues and eigenfunctions of the static-model Hamiltonian with weak and intermediate coupling are considered. The best results are obtained by using coherent-meson-pair states constructed from invariant-pair-free states with up to six p-wave π mesons in a single internal-mode state. The additional states needed for an accurate computation of excited-state energies are exhibited. The best ground-state wave functions are obtained by imposing constraints that are known to be true for the exact ground-state wave function.

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