Quenched glueball spectrum from functional equations

Abstract

We give an overview of results for the quenched glueball spectrum from two-body bound state equations based on the 3PI effective action. The setup, which uses self-consistently calculated two- and three-point functions as input, is completely self-contained and does not have any free parameters except for the coupling. The results for $J^{\mathsf{PC}}=0^{\pm +},2^{\pm +},3^{\pm +},4^{\pm +}$ are in good agreement with recent lattice results where available. For the pseudoscalar glueball, we present first results from a two-loop complete calculation, rendering also the bound state calculation fully self-consistent.

Comments: 8 pages, 5 figures, 1 table, contribution to the proceedings of "A Virtual Tribute to Quark Confinement and the Hadron Spectrum 2021", Aug. 2-6, 2021; v2: corrected numbers in tab. 1