name

Saumen Datta

refid

3686

email

saumen@trek.physics.indiana.edu

title

$f_B$ for Various Actions : Approaching the Continuum Limit with Dynamical Fermions

collaboration

The MILC Collaboration (C. Bernard, S. Datta, T. DeGrand,
C. DeTar, S. Gottlieb, U.M. Heller, J. Hetrick, C. McNeile,
K. Orginos, R. Sugar, D. Toussaint.)

abstract

We present results for pseudoscalar decay constants of heavy-light mesons using
both quenched and $N_F=2$ dynamical fermion configurations. A variety of fermion
actions are investigated : Wilson, nonperturbative clover, and fatlink clover.
For heavy quarks the Fermilab formalism is applied. In the quenched
approximation, results with the nonperturbatively improved clover action of the
Alpha collaboration allow us to study the systematic error of the continuum
extrapolation from the Wilson action. In addition, we use quenched
configurations to explore the effects of fattening. The lessons from the quenched
analyses are then applied to data with dynamical fermions, where both Wilson
and fatlink clover actions have been used. This allows us to attempt a continuum
extrapolation of the dynamical results.

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