Talk presented by Tamas Kovacs

Parallel Session: Topology I

Tuesday June 29th, 15.30 - 15.50, Room 6

Instanton effects in hadron spectroscopy revisited

Abstract: We compare SU(2) clover and Wilson spectroscopy on highly smoothed Monte Carlo and artificially reconstructed instanton configurations. Due to the better chirality of the clover action, the artificial configurations show a marked difference from the free field behaviour obtained with the Wilson action. They however still fail to reproduce the physics observed on the smoothed configurations. A detailed study of the relevant low lying complex modes of the Dirac operator reveals that the most important source of this discrepancy is very likely a to be a finite size effect.

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