2012/04/30 by R. Berg, D. Harnett, R. T. Kleiv +1 · 1 citation
Physics and Astronomy · #hep-ph
paper · pdf · doi:10.1103/physrevd.86.034002
published as Phys. Rev. D86 (2012) 034002 · 10 pages, 7 embedded figures. Analysis extended and refined in v2
arxiv created 2012/05/23 · arxiv updated 2013/01/17
Masses of the pseudoscalar (JPC=0-+) charmonium and bottomonium hybrids are determined using QCD Laplace sum-rules. The effects of the dimension-six gluon condensate are included in our analysis and result in a stable sum-rule analysis, whereas previous studies of these states were unable to optimize mass predictions. The pseudoscalar charmonium hybrid is predicted to have a mass of approximately 3.8 GeV and the corresponding bottomonium prediction is 10.6 GeV. Calculating the full correlation function, rather than only the imaginary part, is shown to be necessary for accurate formulation of the sum-rules. The charmonium hybrid mass prediction is discussed within the context of the X Y Z resonances.