We present results for I=2 pion scattering length with the Wilson fermions in the quenched approximation. The finite size method presented by L\"uscher is employed, and calculations are carried out at β=5.9, 6.1, and 6.3. In the continuum limit, we obtain a result in reasonable agreement with the experimental value.
@article{arxiv.hep-lat/9911025,
title = {I=2 Pion Scattering Length with Wilson Fermions},
author = {JLQCD Collaboration and S. Aoki and M. Fukugita and S. Hashimoto and K-I. Ishikawa and N. Ishizuka and Y. Iwasaki and K. Kanaya and T. Kaneda and S. Kaya and Y. Kuramashi and M. Okawa and T. Onogi and S. Tominaga and N. Tsutsui and A. Ukawa and N. Yamada and T. Yoshié},
journal= {arXiv preprint arXiv:hep-lat/9911025},
year = {2016}
}