Abstract
We consider the one band Hubbard model in the Slave Boson formulation first introduced by Kotliar and Ruckenstein. Applying a modified Mean Field Approximation (MFA), which allows for broken symmetry states, we numerically determine the values of the involved Bose fields at the saddle point. Our data for local Fermion correlation functions agree surprisingly well with data obtained in recent Quantum Monte Carlo calculations.
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