Measurements of branching fraction and $CP$ asymmetry of the ${\bar{B}}^0(B^0)\to K_S^0{K}^{\mp }\ddot{I}{€}^{\pm }$ decay at Belle

Abstract

We report the measurement of the branching fraction and $CP$ asymmetry for the ${\bar{B}}^0(B^0)\to K_S^0{K}^{\mp }\ddot{I}{€}^{\pm }$ decay. The analysis is performed on a data sample of 711 ${\mathrm{fb}}^{-1}$ collected at the $\hat{I}\yen (4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. We obtain a branching fraction of $(3.60\pm 0.33\pm 0.15)\times 10^{-6}$ and an ${\mathcal{A}}_{CP}$ of $(-8.5\pm 8.9\pm 0.2)\%$, where the first uncertainties are statistical and the second are systematic. Hints of peaking structures are also observed in the differential branching fraction as functions of Dalitz variables.

13 pages, 10 figures, ICHEP 2018