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 …

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 …

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 …

A review of the theoretical and experimental status of hybrid hadrons is presented. The
states π 1 (1400), π 1 (1600), and π 1 (2015) are thoroughly reviewed, along with …

QCD Axial Anomaly Enhances the ηη' Decay of the Hybrid Candidate η 1(1855) - IOPscience
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We apply the QCD sum rule method to study the light single-gluon hybrid states with various
(exotic) quantum numbers. We construct 24 single-gluon hybrid currents and use 18 of them …

The Born–Oppenheimer approximation is the standard tool for the study of molecular
systems. It is founded on the observation that the energy scale of the electron dynamics in a …

Using the nonrelativisitc reduction of Coulomb gauge QCD we compute a spectrum of the
low mass hybrid mesons containing a heavy quark-antiquark pair. The gluon degrees of …

We study the fully strange tetraquark states with the exotic quantum numbers JPC= 0+-and
2+-. We construct their corresponding diquark-antidiquark interpolating currents and apply …

We study the double-gluon hybrid states with the quark-gluon contents q¯ qgg (q= u/d) and
s¯ sgg. We construct twelve double-gluon hybrid currents with various quantum numbers …