Burch, Tommy and Gattringer, Christof and Glozman, Leonid Ya. and Hagen, Christian and Lang, C. B.
Variational method for lattice spectroscopy with ghosts.
Physical Review D 73, 017502.
Other URL: http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRVDAQ000073000001017502000001&idtype=cvips&gifs=yes
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.