# Measurements of branching fraction and direct $CP$ asymmetry in ${B}^{±}\to {K}_{S}^{0}{K}_{S}^{0}{K}^{±}$ and a search for ${B}^{±}\to {K}_{S}^{0}{K}_{S}^{0}{\pi }^{±}$

20 February 2019

Abstract: We study charmless hadronic decays of charged $B$ mesons to the final states ${K}_{S}^{0}{K}_{S}^{0}{K}^{±}$ and ${K}_{S}^{0}{K}_{S}^{0}{\pi }^{±}$ using a $711\text{}\text{}{\mathrm{fb}}^{-1}$ data sample that contains $772×{10}^{6}$ $B\overline{B}$ pairs and was collected at the $\Upsilon \left(4S\right)$ resonance with the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{-}$ collider. For ${B}^{±}\to {K}_{S}^{0}{K}_{S}^{0}{K}^{±}$, the measured branching fraction and direct $CP$ asymmetry are $\left[10.42±0.43\left(\mathrm{stat}\right)±0.22\left(\mathrm{syst}\right)\right]×{10}^{-6}$ and $\left[+1.6±3.9\left(\mathrm{stat}\right)±0.9\left(\mathrm{syst}\right)\right]%$, respectively. In the absence of a statistically significant signal for ${B}^{±}\to {K}_{S}^{0}{K}_{S}^{0}{\pi }^{±}$, we obtain a 90% confidence-level upper limit on its branching fraction as $8.7×{10}^{-7}$.

Published in: Physical Review D 99 (2019)