Calculation of $K\to \pi$ matrix elements in quenched domain-wall QCD
  We explore the possibility for an evaluation of non-leptonic $\Delta S=1$ $K$ decay amplitudes through the calculation of $K\to\pi$ matrix elements using domain-wall QCD. The relation between the physical $K\to\pi\pi$ matrix elements and $K\to\pi$ matrix elements deduced from chiral perturbation theory is recapitulated. Quenched numerical simulations are performed on an $16^3\times 32\times 16$ lattice at a lattice spacing $a^{-1}\approx 2$GeV for both the standard plaquette gauge action and a renormalization-group improved gauge action, and reasonable signals for $K\to\pi$ matrix elements are obtained. Preliminary results are reported on the $K\to\pi\pi$ matrix elements, and results from two actions are compared. 
CP-PACS Collaboration : A. Ali Khan, S. Aoki, Y. Aoki, R. Burkhalter,   S. Ejiri, M. Fukugita, S. Hashimoto, N. Ishizuka, Y....