Is the exotic 0-- glueball a pure gluon state ?
Abstract
We present a new calculation of the mass and width of the exotic 0-- glueball in the framework of the QCD sum rules. We next construct a new current which couples to a pure 0-- gluon state and derive consistent and stable sum rules. A previously used current in this approach was shown to be inconsistent. We obtain for this state a mass MG=6.3+0.8-1.1 GeV and an upper limit for the total width G≤ 235 MeV. These values can be used as an important guide for the experimental search of this exotic state. We argue that the mixing of this glueball state with 0-- tetraquark is very small. Therefore, the exotic 0-- glueball can be considered as a pure gluon state.
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