2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/211308Arguments are given that support the interpretation of the lattice QCD glueball and gluelump spectra in terms of bound states of massless constituent gluons with helicity-1. In this scheme, the mass hierarchy of the currently known gluelumps and glueballs is mainly due to the number of constituent gluons and can be understood within a simple flux tube model. It is also argued that the lattice QCD $0^{+-}$ glueball should be seen as a four-gluon bound state. The flux tube model allows for a parameter-free computation of its mass, which is in good agreement with lattice QCD.3 figures, use of package youngtabHigh Energy Physics - PhenomenologyHigh Energy Physics - Latticetext