${\Upsilon}(1S)$ ${\to}$ $B_{c}{\pi}$, $B_{c}K$ decays with perturbative   QCD approach
  With the potential prospects of the ${\Upsilon}(1S)$ at high-luminosity dedicated heavy-flavor factories, the bottom-changing ${\Upsilon}(1S)$ ${\to}$ $B_{c}{\pi}$, $B_{c}K$ weak decays are studied with the pQCD approach. It is found that branching ratio for the color-favored and CKM-favored ${\Upsilon}(1S)$ ${\to}$ $B_{c}{\pi}$ decay can reach up to ${\cal O}(10^{-11})$. So the ${\Upsilon}(1S)$ ${\to}$ $B_{c}{\pi}$ decay might be measured promisingly by the future experiments. 
Junfeng Sun, Qingxia Li, Yueling Yang, Haiyan Li, Qin Chang, Zhiqing   Zhang
hep-ph