The ${\Upsilon}(1S)$ ${\to}$ $B_{c}{\rho}$ decay with perturbative QCD   approach
  With the potential prospects of the ${\Upsilon}(1S)$ data samples at the running LHC and upcoming SuperKEKB, the ${\Upsilon}(1S)$ ${\to}$ $B_{c}{\rho}$ weak decays are studied with the pQCD approach. It is found that (1) the lion's share of branching ratio comes from the longitudinal polarization helicity amplitudes; (2) branching ratio for the ${\Upsilon}(1S)$ ${\to}$ $B_{c}{\rho}$ decay can reach up to ${\cal O}(10^{-9})$, which might be hopefully measurable. 
Junfeng Sun, Yueling Yang, Qingxia Li, Gongru Lu, Jinshu Huang, Qin   Chang
hep-ph