Predictions for production and decay of the pseudoscalar glueball from the Witten-Sakai-Sugimoto model
A. Rebhan* and
F. Brünner*: corresponding author
Pre-published on:
October 26, 2017
Published on:
March 20, 2018
Abstract
The Witten-Sakai-Sugimoto model, a top-down gauge/gravity model of large-Nc low-energy QCD based on type-IIA string theory and Nc D4 branes with chiral quarks added by probe D8 branes, involves only one dimensionless parameter, the 't Hooft coupling at its cutoff (Kaluza-Klein) scale. Although this cutoff scale is around 1 GeV, the model has turned out to be surprisingly predictive also quantitatively, reproducing masses of vector and axial vector mesons, their decay rates, as well as the anomalous mass of the η′ meson, all within 10-30% errors. Using it as a guide for glueball signatures, we have argued that it indicates that the meson f0(1710) may be a nearly pure glueball, with rather specific predictions for the still-to-be-measured 4π and ηη′ decays. Here we present our new predictions for the decay pattern of the (very narrow) pseudoscalar glueball, which is closely related to the U(1)A problem that the model is in fact handling correctly.
DOI: https://doi.org/10.22323/1.314.0545
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