Calculating the I=2 pion scattering length using tadpole improved clover Wilson action on coarse anisotropic lattices Original Research Article

In an exploratory study, using the tadpole improved clover Wilson quark action on small, coarse and anisotropic lattices, the ππ scattering length in the I=2 channel is calculated within quenched approximation. A new method is proposed which enables us to make chiral extrapolation of our lattice results without calculating the decay constant on the lattice. Finite volume and finite lattice spacing errors are analyzed and the results are extrapolated towards the infinite volume and continuum limit. Comparisons of our lattice results with the new experiment and the results from Chiral Perturbation Theory are made. Good agreements are found.