Are there significant scalar resonances in $B^{-}\to D^{(\ast )0}{K}^{-}{K}^0$ decays?

Abstract

We study the indication of large different branching ratios between $B^{-}\to D^{(\ast )0}{K}^{-}{K}^0$ and ${\bar{B}}_d\to D^{(\ast )+}{K}^{-}{K}^0$ observed by Belle. Interestingly, the same situation is not found in the decays $B\to D^{(\ast )}{K}^{-}{K}^{\ast 0}$. If there exist no intermediate resonances in the decays $B^{-}\to D^{(\ast )0}{K}^{-}{K}^0$, a puzzle will be arisen. We find that the color-suppressed processes $B^{-}\to D^{(\ast )0}{a}_0^{-}(1450)$ with $a_0^{-}(1450)\to K^{-}{K}^0$ could be one of the candidates to enhance the BRs of $B^{-}\to D^{(\ast )0}{K}^{-}{K}^0$. Our conjecture can be examined by the Dalitz plot technique and the analysis of angular dependence on $K^{-}{K}^0$ state at $B$ factories.

Comments: 9 pages, 1 figure, revtex4, to appear in Phys. Rev. D