2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39133The coupled cluster method has been applied to the eigenvalue problem lattice Hamiltonian QCD (without quarks) for SU(2) gauge fields in two space dimensions. Using a recently presented new formulation and the truncation prescription of Guo et al. we were able to compute the ground state and the lowest $0^+$-glueball mass up to the sixth order of the coupled cluster expansion. The results show evidence for a ``scaling window'' (i.e. good convergence and constance of dimensionless quantities) around $β=4/g^2 \approx 3$. A comparison of our results to those of other methods is presented.10 pages LaTeX 2.09, 4 postscript figures included as \specialHigh Energy Physics - Latticetext