Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-03-24
Phys.Rev.D79:114033,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 figs, 22 pages
Scientific paper
10.1103/PhysRevD.79.114033
The light scalar meson nonet above 1 GeV ({\it i.e.\}the $a_{0}$, $K^{\ast}_{0}$ and $f_{0}$) are studied within the framework of QCD sum rules. In conventional QCD sum rules, the calculated masses of this nonet are degenerate, and the mass of $K^{\ast}_{0}$ is always larger than the $a_{0}$ in contradiction with the observed spectrum. After improving the correlation function by including instanton effects, the masses are well separated from each other. In particular, our results shows glueball content plays an important role in the underlying structure of $f_{0}(1500)$. The decay constants are also discussed.
Jin Hong-Ying
Lu Ding H.
Zhang James J.
Zhang Zhen-Fu
~Steele ~G. T.
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