Abstract
A coupled-channel analysis has been performed to identify the spectrum of scalar mesons. The data include BESIII data on radiative J/ψ decays into π0π0, KS KS, ηη, and ωϕ, 15 Dalitz plots from ¯N annihilation at rest at LEAR, the CERN-Munich multipoles for ππ elastic scattering, the S-wave from BNL data on ππ scattering into KS KS, from GAMS data on ππ π0π0; ηη, and ηη', and NA48/2 data on low-mass ππ interactions from K± → ππe±v decays. The analysis reveals the existence of ten scalar isoscalar resonances. The resonances can be grouped into two classes: resonances with a large SU(3) singlet component and those with a large octet component. The production of isoscalar resonances with a large octet component should be suppressed in radiative J/ψ decays. However, in a limited mass range centered at 1900MeV, these mesons are produced abundantly. Mainly-singlet scalar resonances are produced over the full mass range but with larger intensity at 1900MeV. The total scalar isoscalar yield in radiative decays into scalar mesons shows a clear peak which is interpreted as the scalar glueball of lowest mass.
Highlights
The analysis reveals the existence of ten scalar isoscalar resonances
Mostly-singlet isoscalar mesons are produced in the full mass range but the yield is enhanced at about 1900 MeV
The data can be fit with ten scalar isoscalar resonances
Summary
Bound states of gluons with any constituent quarks, are a firm prediction of QCD. Lattice gauge theories predict the lowest-mass glueball to have scalar quantum numbers and to have a mass of 1710±50±80 MeV [1]. Tensor and pseudoscalar glueballs are expected well above 2000 MeV. Analytic approximations to QCD find the scalar glueball in the range from 1850 to 1980 MeV [2–4]. Several observed scalar mesons have been proposed to contain a large glueball fraction but no firm conclusions have been reached so far [5–11]. A partial-wave analysis of data carrying information on scalar mesons was reported [12]. I present these results and give my personal interpretation
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