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 …

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 …

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 …

In this study, we choose the scalar and axialvector diquark operators in the color antitriplet
as the fundamental building blocks to construct four-quark currents and investigate the …

The Green's functions of QCD are expanded in powers of the external momenta and of the
quark masses. The Ward identities of chiral symmetry determine the expansion up to and …

P-and T-invariance violation in quantum chromodynamics due to the so-called θ-term is
discussed. It is shown that irrespectively of how the confinement works there emerge …

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 …

The investigation of nuclear matter under extreme conditions is one of the major research
topics of nuclear and high energy physics (a short and necessarily incomplete overview may …

In recent years our understanding of neutron stars has advanced remarkably, thanks to
research converging from many directions. The importance of understanding neutron star …