Application of the Coupled Cluster Method to a Hamiltonian Lattice Field Theory


Abstract in English

The 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 $beta=4/g^2 approx 3$. A comparison of our results to those of other methods is presented.

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