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 …

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 super τ-charm facility (STCF) is an electron–positron collider proposed by the Chinese
particle physics community. It is designed to operate in a center-of-mass energy range from …

Abstract This White Paper presents an overview of the current status and future perspective
of QCD research, based on the community inputs and scientific conclusions from the 2022 …

1 Executive summary The purpose of this document is to outline the developing scientific
case for pursuing an energy upgrade to 22 GeV of the Continuous Electron Beam …

Stimulated by the newly observed a 0 (1817) by the BESIII Collaboration, we find a perfect
Regge trajectory composed of the a 0 (980), a 0 (1450), and a 0 (1817), which leads us to …

Lots of charmonium-like structures have been observed in the last two decades. Most of
them have quantum numbers that can be formed by a pair of charm and anticharm quarks …

We study the decays of the JPC= 1−+ hybrid nonet using a Lagrangian invariant under the
flavor symmetry, parity reversal, and charge conjugation. We use the available experimental …

QCD Axial Anomaly Enhances the ηη' Decay of the Hybrid Candidate η 1(1855) - IOPscience
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We present the first theoretical prediction of the partial decay width of the process J/ψ→ γ η
1, where η 1 is the lightest flavor singlet 1-+ hybrid meson. Our N f= 2 lattice QCD calculation …