## Masses of the Bottom-Charm Hybrid $\bar bGc$ States    [PDF]

Wei Chen, T. G. Steele, Shi-Lin Zhu
QCD sum rules are used to study the bottom-charm hybrid $\bar bGc$ systems which are computationally challenging because they contain different flavours of heavy quarks. The correlation functions and the spectral densities are calculated up to dimension six condensates at leading order of $\alpha_s$ for several $J^P$ quantum numbers. After performing the QCD sum rule analysis, we predict the masses of the $J^P=0^{-}, 0^{+}, 1^{-}, 1^{+}, 2^{-}, 2^{+}$ bottom-charm hybrids. These mass predictions show a similar supermultiplet structure as the bottomonium and charmonium hybrids. We also discuss the possible hadronic decay patterns of the $\bar cGc$, $\bar bGc$ and $\bar bGb$ hybrids including the open-flavour and hidden-flavour mechanisms.
View original: http://arxiv.org/abs/1306.3486