Talk presented by Zbigniew Sroczynski

Parallel Session: Improvement and Renormalization I

Tuesday June 29th, 15.50 - 16.10, Room B

First results from the asymmetric ${\cal O}(a)$ improved Fermilab action

Abstract: We present first results from calculations using an order ${\cal O}(a)$ improved (FNAL) space-time asymmetric fermion action on a $12^3\times 24$ quenched lattice at $\beta=5.7$ and with $c_{SW}=1.57$. The asymmetry parameter $\zeta = \kappa_s / \kappa_t$ is determined nonperturbatively from the energy-momentum dispersion relation. This improvement scheme is mass dependent, and the calculation has been done in the charm and bottom quark mass sectors since it is at these heavier masses that the asymmetry is expected to be relevant.

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