Measurement of branching fraction and direct $CP$ asymmetry in charmless $B^{+}\to K^{+}{K}^{-}{\pi }^{+}$ decays at Belle

We introduce a study of the charmless hadronic decay of the charged $B$ meson to the three-body final state $K^{+}{K}^{-}{\pi }^{+}$. The results are based on a data sample that contains $772\times 10^{6}B\overline{B}$ pairs collected at the ${\rm Y}\left(4S\right)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. The measured inclusive branching fraction and direct $CP$ asymmetry are $(5.38\pm 0.40\pm 0.35)\times {10}^{-6}$ and $-0.170\pm 0.073\pm 0.017$, respectively, where the first uncertainties are statistical and the second are systematic. The $K^{+}{K}^{-}$ invariant mass distribution of the signal candidates shows an excess in the region below $1.5\mathrm{GeV}/c^2$, which is steady with the previous studies from BABAR and LHCb. In addition, strong evidence of a large direct $CP$ asymmetry is found in the low $K^{+}{K}^{-}$ invariant-mass region.