A comparative study of two lattice approaches to two-body systems

摘要

We present a method to extract the spectrum of two-particle systems on thelattice from wave functions computed in lattice simulations. The energies ofthe Hamiltonian eigenstates are extracted from the eigenvalues of a matrix,similar to a potential, constrained by the wave functions. This method iscompared with the traditional variational method in the isospin 2 $\pi\pi$system.