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

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 …

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 …

An extensive spectrum of light non-strange qq ̄ states up to a mass of 2400 MeV has
emerged from Crystal Barrel and PS172 data on p ̄ p→ Resonance→ A+ B in 17 final …

The BES-III Collaboration recently reported the observation of anomalously large isospin
violations in J/ψ→ γ η (1405/1475)→ γ π 0 f 0 (980)→ γ+ 3 π, where the f 0 (980) in the π π …

The authors survey the current status of light-meson spectroscopy, beginning with a general
introduction to meson spectroscopy and its importance in understanding the physical states …

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 …

J/ψ and decays to mesons are a good place to look for glueballs, hybrids and for extracting
strange and non-strange components in mesons. Abundant J/ψ and events have been …

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 …