Speaker
Description
When an exotic hadron locates near the threshold with channel couplings, the internal structure of the exotic hadron is related to the scattering length. To incorporate the threshold effect, the Flatte amplitude has been often used to determine the scattering length. It is however known that an additional constraint is imposed on the Flatte amplitude near the threshold. In this work, we discuss the problem by using the effective field theory (EFT) for the coupled-channel scattering. We propose a new parametrization of the EFT amplitude which can reduce to the Flatte amplitude directly. And then, by using this new parametrization of the amplitude, we discuss the general property of the scattering length and the behavior of the scattering cross section near the threshold through the comparison of the EFT amplitude and the Flatte amplitude.
