Identifying the quark content of the isoscalar scalar mesonsf0(980),f0(1370),andf0(1500)from weak and electromagnetic processes

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Abstract

The assignments of the isoscalar scalar mesons ${f}_{0}(980),$ ${f}_{0}(1370),$ and ${f}_{0}(1500)$ in terms of their flavor substructure is still a matter of heated dispute. Here we employ the weak and electromagnetic decays ${D}_{s}^{+}\ensuremath{\rightarrow}{f}_{0}{\ensuremath{\pi}}^{+}$ and ${f}_{0}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma},$ respectively, to identify the ${f}_{0}(980)$ and ${f}_{0}(1500)$ as mostly $\overline{s}s,$ and the ${f}_{0}(1370)$ as dominantly $\mathrm{n\ifmmode \bar{}\else \={}\fi{}}n,$ in agreement with previous work. The two-photon decays can be satisfactorily described with quark as well as with meson loops, though the latter ones provide a less model-dependent and more quantitative description.

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