Speaker
Dr
Naruhito Ishizuka
(University of Tsukuba)
Description
We presnet our results of the $K\to\pi\pi$ decay amplitudes
for both the $\Delta I=1/2$ and $3/2$ channels.
Calculations are carried out with $N_f=2+1$ gauge configurations
previously generated by the PACS-CS Collaboration
with the Iwasaki gauge action and nonperturbatively
$O(a)$-improved Wilson fermion
at $a=0.091\,{\rm fm}$ and $m_\pi=280\,{\rm MeV}$
on a $32^3\times 64$ ($La=2.9 {\rm fm}$) lattice.
For the calculation of quark loop at the weak operator
in the disconnected diagram,
we use the stochastic method with the hopping parameter expansion technique
and the truncated solver method proposed by Bali et al..
We find that these are very efficient methods.
Primary author
Dr
Naruhito Ishizuka
(University of Tsukuba)
Co-authors
Dr
Akira Ukawa
(Riken AICS)
Dr
Ken-Ichi Ishikawa
(University of Hiroshima)
Dr
Tomoteru Yoshie
(University of Tsukuba)
