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In this article a systematic quantitative analysis of the isoscalar bosonicstates is performed in the framework of supersymmetric light front holographicQCD. It is shown that the spectroscopy of the $\eta$ and $h$ mesons can be welldescribed if one additional mass parameter -- which corresponds to the hardbreaking of chiral $U(1)$ symmetry in standard QCD -- is introduced. The massdifference of the $\eta$ and $\eta'$ isoscalar mesons is then determined by thestrange quark mass content of the $\eta'$. The theory also predicts theexistence of isoscalar tetraquarks which are bound states of diquarks andanti-diquarks. The candidates for these exotic isoscalar tetraquarks areidentified. In particular, the $f_0(1500)$ is identified as isoscalartetraquark; the predicted mass value 1.52 GeV agrees with the measuredexperimental value within the model uncertainties.

The Isoscalar Mesons and Exotic States in Light Front Holographic QCD