Speaker
Mr
Takuya Sugiura
(RCNP, Osaka University)
Description
HAL QCD collaboration has mostly considered the lowest order potential
of the derivative expansion so far based on the assumption that higher
order terms yield minor correction in low energy region.
In this study, we aim at investigating the properties of HAL QCD's non-local
potentials when the derivative expansion is explicitly performed to higher order.
We report the result of our model calculation in a 1+1 dimensional coupled-channel
system.
We introduce a generalized version of the derivative expansion and show
that the potential reproduces scattering phase shift quite well.
The generalized expansion has some favorable features which is also applicable
to the actual lattice QCD calculations.
The possibility of improving the convergence of the expansion is
also discussed in this framework.
Primary author
Mr
Takuya Sugiura
(RCNP, Osaka University)
Co-authors
Dr
Keiko Murano
(RCNP, Osaka University)
Prof.
Makoto Oka
(Department of Physics, Tokyo Institute of Technology)
Prof.
Noriyoshi Ishii
(RCNP, Osaka University)
