June 29, 2015 to July 3, 2015
Pisa
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)

Hall

Building E, Polo Fibonacci, Pisa

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

Speaker

Frederic Brünner (Vienna University of Technology)

Description

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)

Co-authors

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

Presentation materials