Title: Are there significant scalar resonances in $B^{-}\to D^{(*)0} K^{-} {K}^{0}$ decays? Show Chinese title

Title: 在$B^{-}\to D^{(*)0} K^{-} {K}^{0}$衰变中是否存在显著的标量共振？

Abstract: We study the indication of large different branching ratios between $B^{-}\to D^{(*)0} K^{-} {K}^{0}$ and $\bar{B}_{d}\to D^{(*)+} K^{-} {K}^{0}$ observed by Belle. Interestingly, the same situation is not found in the decays $B\to D^{(*)} K^{-} {K}^{*0}$. If there exist no intermediate resonances in the decays $B^{-}\to D^{(*)0} K^{-} {K}^{0}$, a puzzle will be arisen. We find that the color-suppressed processes $B^{-}\to D^{(*)0}a^{-}_{0}(1450)$ with $a^{-}_{0}(1450)\to K^{-} {K}^{0}$ could be one of the candidates to enhance the BRs of $B^{-}\to D^{(*)0} K^{-} {K}^{0}$. Our conjecture can be examined by the Dalitz plot technique and the analysis of angular dependence on $K^{-} {K}^{0}$ state at $B$ factories. Show Chinese abstract

Abstract: 我们研究了Belle观测到的$B^{-}\to D^{(*)0} K^{-} {K}^{0}$和$\bar{B}_{d}\to D^{(*)+} K^{-} {K}^{0}$之间大分支比差异的指示。有趣的是，在衰变$B\to D^{(*)} K^{-} {K}^{*0}$中没有发现相同的情况。如果在衰变$B^{-}\to D^{(*)0} K^{-} {K}^{0}$中不存在中间共振，将会产生一个谜题。我们发现颜色抑制过程$B^{-}\to D^{(*)0}a^{-}_{0}(1450)$与$a^{-}_{0}(1450)\to K^{-} {K}^{0}$可能是增强$B^{-}\to D^{(*)0} K^{-} {K}^{0}$的分支比的候选之一。 我们的假设可以通过Dalitz图技术以及在$B$工厂对$K^{-} {K}^{0}$态的角依赖性分析来检验。