Semileptonic transition of P wave bottomonium $\chi_{b0}(1P)$ to $B_{c}$   meson
  Taking into account the two-gluon condensate contributions, the transition form factors enrolled to the low energy effective Hamiltonian describing the semileptonic $\chi_{b0}\rightarrow B_{c}\ell\bar{\nu}, (\ell=(e,\mu,\tau))$ decay channel are calculated within three-point QCD sum rules. The fit function of the form factors then are used to estimate the decay width of the decay mode under consideration. 
K. Azizi, H. Sundu, J. Y. Sungu
hep-ph