The general propagator for S-wave threshold states
arXiv:2401.03373 · doi:10.1007/JHEP01(2025)102
Abstract
We demonstrate that the propagator, derived from an Effective Field Theory (EFT) that incorporates Weinberger's compositeness theorem, provides a more general formula for describing S-wave near-threshold states. By fitting the lineshape using this propagator, we can extract the factor for these states and elucidate their structures.
17pages, the charged channel of the X(3872) added