June 29, 2015 to July 3, 2015
Europe/Rome timezone

Glueball decay in the Witten-Sakai-Sugimoto model

Jul 2, 2015, 1:10 PM
1h 20m
Hall (Building E, Polo Fibonacci, Pisa)


Building E, Polo Fibonacci, Pisa

Poster Hadron Structure and Meson-Baryon Interaction Working Group Poster Session


Frederic Brünner (Vienna University of Technology)


I present new results on glueball decay rates in the Sakai-Sugimoto model, a holographic top-down approach for QCD with chiral quarks based on a probe-brane construction within Witten’s holographic model of nonsupersymmetric Yang-Mills theory. We calculated [1] rates for decays into two pions, two vector mesons and four pions, using a range of the ’t Hooft coupling which closely reproduces the decay rate of ρ and ω mesons and leads to a value for the gluon condensate consistent with QCD sum rules. We concluded that the holographic mode corresponding to the lowest excitation of a dilatonic scalar provides a narrow glueball state in the right mass range for an identification with f0(1500) or f0(1710), while the results actually favour the latter as a glueball candidate. This conclusion receives further support from our latest work [2] on implementing finite masses for pseudoscalar mesons by extrapolating from the calculable vertex of glueball fields and the η meson, which is a consequence of the Witten-Veneziano mechanism. In line with the mechanism of chiral suppression [3], we found a considerable enhancement of the decay of scalar glueballs into kaons and the η meson, in close agreement with experimental data on f0(1710). References 1. F. Bruenner, D. Parganlija and A. Rebhan, Glueball Decay Rates in the Witten-Sakai-Sugimoto Model, arXiv:1501.07906. 2. F. Bruenner and A. Rebhan, Nonchiral enhancement of scalar glueball decay in the Witten-Sakai-Sugimoto model , arXiv:1504.05815. 3. M. Chanowitz, Phys. Rev. Lett. 95, 172001 (2005).

Primary author

Frederic Brünner (Vienna University of Technology)


Anton Rebhan (Institute for Theoretical Physics, Vienna University of Technology) Denis Parganlija (Institute for Theoretical Physics, Vienna University of Technology)

Presentation materials