Calculation of $K \to ππ$ decay amplitudes with improved Wilson fermion

We present results of our trial calculation of the $K \to ππ$ decay amplitudes with the improved Wilson fermion action. Calculations are carried out with $N_f=2+1$ gauge configurations generated with the Iwasaki gauge action and non-perturbatively $O(a)$-improved Wilson fermion action at $a=0.091\,{\rm fm}$, $m_π=280\,{\rm MeV}$ and $m_K=560\,{\rm MeV} (\sim 2 m_π)$ on a $32^3\times 64$ ($La=2.9 {\rm fm}$) lattice.

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