We present a preliminary report on a calculation of scattering length for I=2 S-wave two-pion system directly from the two-pion wave function. Results are compared with those calculated from the time dependence of two-pion four-point functions. Calculations are made with an RG-improved action for gluons and improved Wilson action for quarks at a−1=1.207(12) GeV on 203×48 and 243×48 lattices.
Cite
@article{arxiv.hep-lat/0309168,
title = {I=2 Pion Scattering Length from Two-Pion Wave Function},
author = {N. Ishizuka and T. Yamazaki},
journal= {arXiv preprint arXiv:hep-lat/0309168},
year = {2009}
}