The Effects of Colored Glue in the QCD Motivated Bag of Heavy Quark - anti-Quark Systems
Mar, 19807 pages
Published in:
- Phys.Lett.B 95 (1980) 299-305
- Published: 1980
Report number:
- CERN-TH-2837
Citations per year
Abstract: (Elsevier)
The QCD motivated bag model is elaborated and applied to heavy quark-antiquark systems. The effect of coloured glue in the model is shown to explain the rapid cross-over of the static Q Q potential from the asymptotically free Coulomb regime into the linear confinement regime. The spin-dependent force between static quarks is derived in Coulomb gauge from the exchange of a confined transverse gluon. The dimensional bag parameter Λ B = 235 MeV and the quark-gluon coupling constant α = 0.38 (as defined at r Q Q ≈ 0.2 fm ) determined from a good fit of the c c and b b spectra. The fit is in serious disagreement with the widely accepted MIT parameters. As an important test of our model, we calculate the rich spectrum of (Q Q glue) states. In υ particle spectroscopy we predict a narrow (Q Q glue) state with exotic quantum numbers J PC = 1 −+ below the B B threshold. Its experimental confirmation would be the first direct evidence for coloured glue in the hadron spectrum.- QUARK ANTIQUARK: BOUND STATE
- heavy quark
- MODEL: BAG
- QUARK ANTIQUARK: POTENTIAL
- GAUGE FIELD THEORY: COULOMB GAUGE
- QUARK GLUON: COUPLING CONSTANT
- COUPLING CONSTANT: QUARK GLUON
- UPSILON MESONS: POSTULATED PARTICLE
- GLUON: CONFINEMENT
- HADRON SPECTROSCOPY
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