Speaker
Jongjeong Kim
(Department of Physics and Astronomy, Seoul National University)
Description
We present results of one-loop perturbative matching factors for
four-fermion operators constructed using HYP/$\overline{\rm FAT7}$
staggered fermions. We use both unimproved (Wilson) and improved
(Symanzik) gluon actions. The latter choice of action is relevant
to our ongoing project of calculating $B_K$ and
$\epsilon'/\epsilon$. To estimate the quantitative effect of using
Symanzik improved gluon action, we compare the following four
choices of actions: (1) unimproved staggered fermions with Wilson
gluons (2) HYP/$\overline{\rm FAT7}$ staggered fermions with Wilson
gluons, (3) unimproved staggered fermions with Symanzik gluons, and
(4) HYP/$\overline{\rm FAT7}$ staggered fermions with Symanzik
gluons. We discuss the effect of the improved glue on reducing the
size of one-loop perturbative corrections to four-fermion
operators.
| Please, insert your presentation type (talk, poster) | talk |
|---|
Primary authors
Jongjeong Kim
(Department of Physics and Astronomy, Seoul National University)
Prof.
Stephen Sharpe
(Department of Physics, University of Washington)
Prof.
Weonjong Lee
(Department of Physics and Astronomy, Seoul National University)
