Range correction in the weak-binding relation for unstable states
To determine the fraction of a hadronic molecule component of exotic hadrons in a model-independent manner, we consider the weak-binding relation. However, it dose not work well for the systems with a large effective range such as $\Lambda_c(2595)$. We introduce the range correction to the relation and we perform the numerical calculation to search for the parameter regions where the weak-binding relation works. We find the region where only the improved weak-binding relation can be applied.