Quantum Chromodynamics, the theory of quarks and gluons, whose interactions can be
described by a local SU (3) gauge symmetry with charges called “color quantum numbers” …

The past decades witnessed the golden era of hadron physics. Many excited open heavy
flavor mesons and baryons have been observed since 2017. We shall provide an updated …

Conventional, hadronic matter consists of baryons and mesons made of three quarks and a
quark–antiquark pair, respectively,. Here, we report the observation of a hadronic state …

Chiral symmetry and its spontaneous breaking play an important role both in the light
hadron and heavy hadron systems. The chiral perturbation theory (χ PT) is the low energy …

An exotic narrow state in the $ D^ 0D^ 0\pi^+ $ mass spectrum just below the $ D^{*+} D^ 0$
mass threshold is studied using a data set corresponding to an integrated luminosity of 9 fb …

The quark model was formulated in 1964 to classify mesons as bound states made of a
quark–antiquark pair, and baryons as bound states made of three quarks. For a long time all …

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

The spectrum of hadronic molecules composed of heavy–antiheavy charmed hadrons has
been obtained in our previous work. The potentials are constants at the leading order, which …

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 …

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 …