Study of W-exchange Mode $D^0\to \varphi {\bar{K}}^0$

Dong-Sheng Du, Ying Li, Cai-Dian Lü

We calculate the branching ratio of $D^0\to \varphi {\bar{K}}^0$ decay using the so-called perturbation QCD approach based on $k_T$ factorization. Our result shows this branching ratio is $…