DDsigma coupling constant

초록

We investigate the DDsigma coupling constant, based on the dispersion relation. Combining the pipi amplitude with the off-mass shell D\bar{D}-> \pi\pi amplitude, we solve the rescattering qeuation for $D\bar{D}\text{toD}\bar{D}$ spectral function. Using the dispersion relation, we determine the $DD\sigma$ coupling. We discuss its cut-off dependence and the mass of the $\sigma$ meson.