The past seventeen years have witnessed tremendous progress on the experimental and
theoretical explorations of the multiquark states. The hidden-charm and hidden-bottom …

Multiquark resonances are undoubtedly experimentally observed. The number of states and
the amount of details on their properties have been growing over the years. It is very recent …

This review presents an overview of the remarkable progress in the field of heavy-quark
exotic hadrons over the past 15 years. It seeks to be pedagogical rather than exhaustive …

In the past decade many charmonium-like states were observed experimentally. Especially
those charged charmonium-like Z c states and bottomonium-like Z b states cannot be …

A golden age for heavy-quarkonium physics dawned a decade ago, initiated by the
confluence of exciting advances in quantum chromodynamics (QCD) and an explosion of …

A bstract The decays B+→ J/ψπ+ π− K+ are studied using a data set corresponding to an
integrated luminosity of 9 fb− 1 collected with the LHCb detector in proton-proton collisions …

The past decade witnessed a remarkable proliferation of exotic charmonium-like
resonances discovered at accelerators. In particular, the recently observed charged states …

We perform an analytical study of the scattering matrix and bound states in problems with
many physical coupled channels. We establish the relationship of the couplings of the states …

Evidence for the decay mode X (3872)→ ψ (2 S) γ in B+→ X (3872) K+ decays is found with
a significance of 4.4 standard deviations. The analysis is based on a data sample of proton …

In the past years there has been a revival of hadron spectroscopy. Many interesting new
hadron states were discovered experimentally, some of which do not fit easily into the quark …