Glueballs, hybrids and multiquark states are predicted as bound states in models guided by
quantum chromo dynamics (QCD), by QCD sum rules or QCD on a lattice. Estimates for the …

We discuss theoretical predictions for the existence of exotic (non-quark-model) mesons and
review prominent experimental candidates. These are especially the f0 (1500) and f0 (1710) …

This biennial Review summarizes much of particle physics. Using data from previous
editions, plus 2158 new measurements from 551 papers, we list, evaluate, and average …

Glueballs and other resonances with large gluonic components are predicted as bound
states by Quantum Chromodynamics (QCD). The lightest (scalar) glueball is estimated to …

This report reviews the achievements of the Crystal Barrel experiment at the Low-Energy
Antiproton Ring (LEAR) at CERN. During seven years of operation Crystal Barrel has …

We develop tools to determine the gluonic content of a resonance of known mass, width,
and J PC from its branching fraction in radiative quarkonium decays and production cross …

The general properties of antiproton–proton annihilation at rest are presented, with special
focus on the two-meson final states. The data exhibit remarkable dynamical selection rules …

Using a data sample of (10087±44)× 10 6 J/ψ events collected by the BESIII detector in
2009, 2012, 2018 and 2019, the electromagnetic Dalitz process J/ψ→ e+ e-η (1405) is …

In this article, the analyticity of triangle loop integral with complex masses of internal
particles is discussed in a new perspective, based on which we obtain the explicit width …

Several states containing multiple strange quark resonances have been detected
experimentally over the past two decades. The mass spectra for strangeonium mesons …