Radiative Meson and Glueball Decays in the Witten-Sakai-Sugimoto Model

Abstract

We calculate radiative decay rates of mesons and glueballs in the top-down holographic Witten-Sakai-Sugimoto model with finite quark masses. After assessing to what extent this model agrees or disagrees with experimental data, we present its predictions for so far undetermined decay channels. Contrary to widespread expectations, we obtain sizeable two-photon widths of scalar, tensor, and pseudoscalar glueballs, suggesting in particular that the observed two-photon rate of the glueball candidate $f_0(1710)$ is not too large to permit a glueball interpretation, but could be even much higher. We also discuss the so-called exotic scalar glueball, which in the Witten-Sakai-Sugimoto model is too broad to match either of the main glueball candidates $f_0(1500)$ and $f_0(1710)$, but might be of interest with regard to the alternative scenario of the so-called fragmented scalar glueball. Employing the exotic scalar glueball for the latter, much smaller two-photon rates are predicted for the ground-state glueball despite a larger total width; relatively large two-photon rates would then apply to the excited scalar glueball described by the predominantly dilatonic scalar glueball. In either case, the resulting contributions to the muon $g-2$ from hadronic light-by-light scattering involving glueball exchanges are small compared to other single meson exchanges, of the order of $\lesssim 10^{-12}$.

arXiv commentREVTEX 41 pages, 11 tables; v2: minor additions and corrections, 2 references added

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Cited by in corpus (8)

• The anomalous magnetic moment of the muon in the Standard Model: an update
• Gravitational form factors of pion from top-down holographic QCD
• Is $f_2(1950)$ the tensor glueball?
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• Scalar-glueball-mediated scale-anomaly dominance of the confining pressure of the pion in holographic QCD
• The radiative decay of scalar glueball from lattice QCD
• Sakai-Sugimoto Model in an Off-Shell: Chiral Lagrangian to All Orders