Abstract
Axial vector (JPC = 1++) charmonium and bottomonium hybrid masses are determined via QCD Laplace sum-rules. Previous sum-rule studies in this channel did not incorporate the dimension-six gluon condensate, which has been shown to be important for 1−− and 0−+ heavy quark hybrids. An updated analysis of axial vector charmonium and bottomonium hybrids is presented, including the effects of the dimension-six gluon condensate. The axial vector charmonium and bottomonium hybrid masses are predicted to be 5.13 and 11.32 GeV, respectively. We discuss the implications of this result for the charmonium-like ‘XYZ’ states and the charmonium hybrid multiplet structure observed in recent lattice calculations.
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