The branching ratio and direct CP asymmetry of the ? ( 1 S ) → B c D s weak decay are estimated with the perturbative QCD approach firstly. It is found that (1) the direct CP -violating asymmetry is close to zero, (2) the branching ratio B r ( ? ( 1 S ) → B c D s ) ? 10 ? 10 might be measurable at the future experiments.
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机译：分支比和直接Cp不对称性？ （1 s）→B C D S弱衰减首先通过扰动QCD方法估算。结果发现（1）直接Cp - 硫化不对称性接近于零，（2）分支比B r（α（1 s）→b c d s）？ 10？ 10可能在未来的实验中可衡量。
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