Is $f_0(1500)$ a Scalar Glueball?

Abstract

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 incompatible with them both being $\text{qqbar}$ mesons. We show instead that $f_0(1500)$ is compatible with the ground state glueball expected around 1500 MeV mixed with the nearby states of the $0^{++}$ $Q\bar{Q}$ nonet. Tests of this hypothesis include the prediction of a further scalar state, $f_0^{\prime }(1500-1800)$ which couples strongly to $K\bar{K}$, $\eta \eta$ and $\eta {\eta }^{\prime }$. Signatures for a possible tensor glueball at $\sim$2 GeV are also considered.

Comments: 11 figures; PS files or hard copy available from C Amsler