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) …

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 …

Following the discovery of two new scalar mesons f 0 (1370) and f 0 (1500) at the Low
Energy Antiproton Ring at CERN, we argue that the observed properties of this pair are …

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 …

A coupled-channel analysis of BESIII data on radiative J/ψ decays into ππ, KK¯, ηη and ωϕ
has been performed. The partial-wave amplitude is constrained by a large number of further …

A very general model and an analysis of data on the lightest 0++ meson nonet shows that
the f 0 (980) and f 0 (1300) resonance poles are two manifestations of the same ss state. On …

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 …

We show that the newly discovered scalar meson f0 (1500) at LEAR has properties
compatible with the lightest scalar glueball predicted by lattice QCD and incompatible with a …

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 …