The Isoscalar Mesons and Exotic States in Light Front Holographic QCD

Abstract

In this article a systematic quantitative analysis of the isoscalar bosonic states is performed in the framework of supersymmetric light front holographic QCD. It is shown that the spectroscopy of the $\eta$ and $h$ mesons can be well described if one additional mass parameter -- which corresponds to the hard breaking of chiral $U(1)$ symmetry in standard QCD -- is introduced. The mass difference of the $\eta$ and ${\eta }^{\prime }$ isoscalar mesons is then determined by the strange quark mass content of the ${\eta }^{\prime }$. The theory also predicts the existence of isoscalar tetraquarks which are bound states of diquarks and anti-diquarks. The candidates for these exotic isoscalar tetraquarks are identified. In particular, the $f_0(1500)$ is identified as isoscalar tetraquark; the predicted mass value 1.52 GeV agrees with the measured experimental value within the model uncertainties.

20 pages, 2 figures

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Cited by in corpus (5)

• Light-front holography with chiral symmetry breaking
• Towards a theory of bottom-up holographic models for linear Regge trajectories of light mesons
• Longitudinal dynamics for mesons on the light cone
• Light-Front Holography and Supersymmetric Conformal Algebra: A Novel Approach to Hadron Spectroscopy, Structure, and Dynamics
• Study of light tetraquark spectroscopy