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Variational method for lattice spectroscopy with ghosts

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Burch, Tommy ; Gattringer, Christof ; Glozman, Leonid Ya. ; Hagen, Christian ; Lang, C. B.
Date of publication of this fulltext: 05 Aug 2009 13:32


We discuss the variational method used in lattice spectroscopy calculations. In particular we address the role of ghost contributions which appear in quenched or partially quenched simulations and have a non-standard euclidean time dependence. We show that the ghosts can be separated from the physical states. Our result is illustrated with numerical data for the scalar meson.

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