Abstract
We study the scalar, vector and tensor two-gluon and trigluon glueball spectra in the framework of the 5-dimension dynamical holographic QCD model, where the metric structure is deformed self-consistently by the dilaton field. For comparison, the glueball spectra are also calculated in the hard-wall and soft-wall holographic QCD models. In order to distinguish glueballs with even and odd parities, we introduce a positive and negative coupling between the dilaton field and glueballs, and for higher spin glueballs, we introduce a deformed 5-dimension mass. With this set-up, there is only one free parameter from the quadratic dilaton profile in the dynamical holographic QCD model, which is fixed by the scalar glueball spectra. It is found that the two-gluon glueball spectra produced in the dynamical holographic QCD model are in good agreement with lattice data. Among six trigluon glueballs, the produced masses for 1±− and 2−− are in good agreement with lattice data, and the produced masses for 0−−, 0+− and 2+− are around 1.5 GeV lighter than lattice results. This result might indicate that the three trigluon glueballs of 0−−, 0+− and 2+− are dominated by the three-gluon condensate contribution.
Highlights
Quantum chromodynamics (QCD) is accepted as the fundamental theory of describing strong interaction
We introduce a deformed 5dimension mass for higher spin glueballs, and in order to distinguish glueballs with even and odd parities, we introduce the positive and negative coupling between the dilaton field and glueballs.With this set-up, we calculate the glueball spectra in the modified dynamical holographic QCD model in Sec. 5 and find that the two-gluon glueball spectra are in good agreement with lattice data and the trigluon glueball spectra agree with results from QCD sum rules
We study scalar, vector and tensor glueball spectra in the framework of 5dimension dynamical holographic QCD model, where the metric structure is deformed self-consistently by the dilaton field
Summary
Quantum chromodynamics (QCD) is accepted as the fundamental theory of describing strong interaction. For the scalar glueball spectra, it was shown in Ref.[29] that, comparing with the results in the hard-wall and soft-wall holographic QCD models [23], the scalar glueballs including the lowest state and excited states can be surprisingly well described in the DhQCD model. We introduce a deformed 5dimension mass for higher spin glueballs, and in order to distinguish glueballs with even and odd parities, we introduce the positive and negative coupling between the dilaton field and glueballs.With this set-up, we calculate the glueball spectra in the modified dynamical holographic QCD model in Sec. 5 and find that the two-gluon glueball spectra are in good agreement with lattice data and the trigluon glueball spectra agree with results from QCD sum rules.
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