A Laplace Sum-Rules Analysis of Heavy Pseudoscalar (JPC=0−+) Hybrids

We use QCD sum-rules to predict ground state masses for pseudoscalar (JPC=0−+) charmonium and bottomonium hybrids. We find that the inclusion of a six-dimensional gluon condensate contribution is needed to stabilize the analyses. For the charmonium hybrid, we find a mass of (3.82 ± 0.13) GeV; for the bottomonium hybrid, we find a mass of (10.64 ± 0.19) GeV. We comment on possible phenomenological implications concerning the Y(3940).