Axial vector (JPC=1++) charmonium and bottomonium hybrid mass predictions with QCD sum-rules

Axial vector (J(PC) = 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.