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” …

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 …

The spectrum of hadrons is the manifestation of color confinement of quantum
chromodynamics. Hadronic resonances correspond to poles of the S-matrix. Since 2003 …

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 two decades, a plethora of hadronic states beyond the conventional quark model
of qq ̄ mesons and qqq baryons have been observed experimentally, which motivated …

Abstract The Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany,
provides unique possibilities for a new generation of hadron-, nuclear-and atomic physics …

We have analyzed the singularities of a triangle loop integral in detail and derived a formula
for an easy evaluation of the triangle singularity on the physical boundary. It is applied to the …

The last two decades have witnessed the discovery of a myriad of new and unexpected
hadrons. The future holds more surprises for us, thanks to new-generation experiments …

We review our investigations devoted to the analysis of the resonances Zc (3900), Zc (4430),
Zc (4100), X (4140), X (4274), α1 (1420), Y (4660), X (2100), X (2239), and Y (2175) …

The topical workshop Strong QCD from Hadron Structure Experiments took place at
Jefferson Lab from November 6–9, 2019. Impressive progress in relating hadron structure …