A large number of experimental discoveries especially in the heavy quarkonium sector that
did not meet the expectations of the until then very successful quark model led to a …

In the past decade, exotic hadrons with charm and bottom flavors have been extensively
studied both in experiments and in theories. In this review, we provide topical discussions by …

A coupled-channel approach is applied to the charged tetraquark state T cc+ recently
discovered by the LHCb Collaboration. The parameters of the interaction are fixed by a fit to …

The doubly charmed tetraquark T cc+ recently discovered by the LHCb Collaboration is
studied on the basis of (2+ 1)-flavor lattice QCD simulations of the D* D system with nearly …

Single-and double-heavy baryons are studied in the constituent quark model. The model
Hamiltonian is chosen as a standard one with two exceptions:(1) the color-Coulomb term …

We highlight the progress, current status, and open challenges of QCD-driven physics, in
theory and in experiment. We discuss how the strong interaction is intimately connected to a …

We investigate the possibility of qq′ b¯ b¯ tetraquark bound states using nf= 2+ 1 lattice
QCD ensembles with pion masses≃ 164, 299, and 415 MeV. Motivated by observations …

We continue our study of heavy-light four-quark states and find evidence from lattice QCD for
the existence of a strong-interaction-stable I (JP)= 0 (1+) udc¯ b¯ tetraquark with mass in the …

According to the classification of the quark model, the hadrons going beyond three-quark
baryon and quark-antiquark meson pictures are called exotic hadrons. Many new hadrons …

The physics of exotic hadrons is revisited and reviewed, with emphasis on flavour
configurations which have not yet been investigated. The constituent quark model of …