Scalar mesons: in search of the lightest glueball

Abstract

According to the QCD expectations the lightest glueball should be a scalar particle (J^{PC}=0^{++}). Different scenarios have been considered for a classification of these states but -- despite considerable progress in recent years -- the experimental basis for various parameters is still rather weak. We present a new analysis of the elastic and charge exchange pi pi scattering between 1000 and 1800 MeV. A unique solution is selected which shows clear evidence for f_0(1500) and a broad state (σor ``f_0(1000)''), but there is no evidence for f_0(1370) at a level of \gtrsim 10% branching ratio to pi pi. Arguments in favour of the broad state to be a glueball are summarized.

talk presented at QCD06, Montpellier, France, July3-7, 2006

Cited by in corpus (11)

• The Physics of Glueballs
• The Status of Glueballs
• 50 Years of Quantum Chromodynamics
• Holographic glueball structure
• Glueball nature of the sigma/f_0(600) from pi-pi and gamma-gamma scatterings
• Gluonium nature of the sigma/f_0(600) from its coupling to KK
• sigma and f_0(980) substructures from gamma-gamma to pi-pi, J/psi, phi radiative and D_s semi-leptonic decays
• Light scalar mesons in QCD
• Glueballs and Mesons: the Ground States
• Probing the substructure of $f_0(1370)$
• Two-photon width and gluonic component of sigma/f_0(600)