JPC=1++ heavy hybrid masses from QCD sum-rules

QCD Laplace sum-rules are used to calculate axial vector (J(PC) = 1(++)) charmonium and bottomonium hybrid masses. Previous sum-rule studies of axial vector heavy quark hybrids did not include the dimension-six gluon condensate, which has been shown to be important in the 1(--) and 0(-+) channels. An updated analysis of axial vector heavy quark hybrids is performed, including the effects of the dimension-six gluon condensate, yielding mass predictions of 5.13 GeV for hybrid charmonium and 11.32 GeV for hybrid bottomonium. The charmonium hybrid mass prediction dis-favours a hybrid interpretation of the X(3872), if it has J(PC) = 1(++), in agreement with the findings of other theoretical approaches. It is noted that QCD sum-rule results for the 1(--), 0(-+) and 1(++) channels are in qualitative agreement with the charmonium hybrid multiplet structure observed in recent lattice calculations.