Abstract
The \$\Upsilon(nS)\$ \$\to\$ \$B\_cD\_s\$, \$B\_cD\_d\$ weak decays are
studied with the pQCD approach firstly. It is found that branching ratios
\$Br(\Upsilon(nS)\toB\_cD\_s)\$ \$\sim\$ \$O(10^-10)\$ and
\$Br(\Upsilon(nS)\toB\_cD\_d)\$ \$\sim\$ \$O(10^-11)\$, which
might be measurable in the future experiments.
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