Holographic Glueball Decay
Abstract
We announce new results on glueball decay rates in the Sakai-Sugimoto model, a realization of holographic QCD from first principles that has only one coupling constant and an overall mass scale as free parameters. We extend a previous investigation by Hashimoto, Tan, and Terashima who have considered the lowest scalar glueball which arises from a somewhat exotic polarization of supergravity modes and whose mass is uncomfortably small in comparison with lattice results. On the other hand, the scalar glueball dual to the dilaton turns out to have a mass of about twice the mass of the rho meson (1487 MeV), very close to the scalar meson that is frequently interpreted as predominantly glue. Calculating the decay rate into two pions we find a surprisingly good agreement with experimental data for the . We have also obtained decay widths for tensor and excited scalar glueballs, indicating universal narrowness.
Keywords
Cite
@article{arxiv.1407.6914,
title = {Holographic Glueball Decay},
author = {Frederic Brünner and Denis Parganlija and Anton Rebhan},
journal= {arXiv preprint arXiv:1407.6914},
year = {2014}
}
Comments
Proceedings based on a talk by F. Br\"unner at Excited QCD 2014; v2: Erratum included, containing corrected results for the decay rate into two pions; v3: minor corrections