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A collective treatment of the I=0 scalar mesons below 2 GeV [sigma (550),f0(980), f0(1370), f0(1500) and f0(1710)] in a non-linear chiral Lagrangianframework that is constrained by the mass and the partial decay widths of theI=1/2,1 scalars [kappa(900), K0*(1430), a0(980) and a0(1450)] is presented. Thesub-structure of these states in terms of two and four quark components, aswell as a glueball component is explored, and its correlation with the mass off0(1370) is studied. Consistency with the available experimental data suggeststhat the sigma(550) is dominantly a non-strange four-quark state, whereas thesub-structure of other I=0 states are sensitive to the input mass of f0(1370).This investigation estimates the scalar glueball mass in the range 1.47--1.64GeV.Comment: 12 pages, revtex, 2 figs; numerical work updated, typos corrected,  refs adde

ISOSINGLET SCALAR MESONS BELOW 2 GeV AND THE SCALAR GLUEBALL MASS