1996/12/31 by Stéphan Narison, Stephan Narison · 12 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-lat #hep-ph #nucl-th
paper · pdf · doi:10.1016/s0550-3213(97)00562-2
published as Nucl.Phys.B509:312-356,1998 · 33 pages, latex 2e source+19 figures inside the text, compressed files, minor changes (version to appear in Nucl.Phys. B) Montpellier preprint PM 96/37
arxiv created 1997/08/05 · openalex publication_date 1998/01/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We compute the masses and decay widths of gluonia using QCD spectral sum rules and low-energy theorems. In the scalar sector, one finds a gluonium having a mass MG=(1.5± 0.2) GeV, which decays mainly into the U(1)A channels ηη' and 4π0. However, for a consistency of the whole approach, one needs broad-low mass gluonia (the σ and its radial excitation), which couple strongly to the quark degrees of freedom similarly to the η' of the U(1)A sector. Combining these results with the ones for the qq quarkonia, we present maximal quark-gluonium mixing schemes, which can provide quite a good description of the complex spectra and various decay widths of the observed scalar mesons σ(1.0),f0(0.98),f0(1.37),f0(1.5) and fJ(1.71). In the tensor sector, the gluonium mass is found to be MT≃ (2.05± 0.19) GeV, which makes the ζ(2.2) a good 2++ gluonium candidate, even though we expect a rich population of 2++ gluonia in this region. In the pseudoscalar channel, the gluonium mass is found to be MP≃ (2.05± 0.19) GeV, while we also show that the E/ι(1.44) couples more weakly to the gluonic current than the η', which can favour its interpretation as the first radial excitation of the η'(0.96).