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The internal structure of a hadron, as a key topic in the nuclear and particle physics, can be accessed by hadronic scattering, production, and/or its decay. As it is known Quantum Chromodynamics (QCD) is a nonperturbative quantum field theory at the low-energy region, and many approaches have been proposed for studying different aspects of this rich dynamics, e.g., the various quark models, BetheSalpeter (BS) equation approach, QCD sum rules, and lowenergy effective field theories. Flavor physics is a research field which allows us to probe the charm and beauty quark decays. On the other hand, the exotic heavy-quark hadron physics becomes very fashionable since the discovery of the X(3872). As we know QCD does not exclude the existence of exotic hadrons (with quantum numbers that do not fit for  in the case of mesons and  for baryons), but we still have no way to predict all the exotic hadrons from first-principle calculations (despite the advances in lattice QCD). Studies on the   states certainly help our understanding on the underlying dynamics of QCD. Based on such circumstance, we propose a current special issue, where both theoretical and experimental papers have been attracted. In the paper by F. Yan and B. Zheng, a tag method is proposed that allows a direct absolute measurement of the decay branching fractions of the / with the data set at the (3686); namely, the / is produced from the decay

Joint Topics on Exotic Hadron States and Heavy Flavor Hadronic Decay