Lattice study of πK scattering length

We report lattice QCD results of scattering amplitudes of πK system for both I=3/2 and 1/2 channles. The lattice simulations are made in the quenched approximation at β=2.23 on a 123×24 lattice. The hopping parameters of κud=0.1570,0.1580 and κs=0.1546,0.1570 are used. A clear difference of energy shift is found between I=3/2 and I=1/2 channels.