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Comprehensive Study of $\overline B^0\to K^0(\overline K^0) K^\mpπ^\pm$ Decays in the Factorization Approach

Using the factorization approach, we investigate the $\overline B^0 \to \overline K^0K^+π^-$ and $\overline B^0 \to K^0K^-π^+$ decays individually including the resonant and nonresonant contributions. Under the flavor SU(3) symmetry, we obtain the total branching fraction $BR [\overline B^0 \to (\overline K^0K^+π^-+K^0K^-π^+)]=(7.17^{+0.50+1.97+0.08}_{-0.53-1.42-0.07})\times 10^{-6}$, which is in agreement with the recent measurements of BaBar and LHCb within errors. For the decay $\overline B^0 \to \overline K^0K^+π^-$, the nonresonant background and $a_0^+(1450)$ pole in the current-induced process provide large contribution, the latter of which has not been included in previous studies. On the contrary,the decay $\overline B^0 \to K^0K^-π^+$ is dominated by the nonresonant background and the offshell $ρ^-$ pole. When the flavor SU(3) symmetry breaking and the final-state rescattering are considered under two different scenarios, the results can also accommodate the experimental data with large uncertainties. Moreover, the direct $CP$ asymmetry of $\overline B^0 \to \overline K^0K^+π^-$ is found to be sensitive to the matrix element of scalar density. These predictions could be further tested in the LHCb experiment or Super-b factory in future.