Study of charmless decays $B^{\pm} \to K^{0}_{S} K^{0}_{S} h^{\pm}$ ($h=K,\pi$) at Belle

TL;DR

This study searches for charmless decays of charged B mesons into specific final states using Belle data, measuring branching fractions and CP asymmetries, and setting upper limits where signals are not significant.

Contribution

It provides the first precise measurements of branching fractions and CP asymmetries for these charmless B decay modes, with improved sensitivity over previous searches.

Findings

Measured branching fraction for $B^{m{ ext{±}}} o K^{0}_{S} K^{0}_{S} K^{m{ ext{±}}}$ is approximately 10.64 x 10^{-6}.

No significant signal observed for $B^{m{ ext{±}}} o K^{0}_{S} K^{0}_{S} m{ ext{π}}^{m{ ext{±}}}$, upper limit set at 1.14 x 10^{-6}.

Results are consistent with Standard Model predictions and improve constraints on rare B decays.

Abstract

We report a search for charmless hadronic decays of charged $B$ mesons to the final states $K^{0}_{S} K^{0}_{S} K^{\pm}$ and $K^{0}_{S} K^{0}_{S} \pi^{\pm}$ . The results are based on a $711 {fb}^{-1}$ data sample that contains $772 \times 10^6$ $B \bar{B}$ pairs, and was collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. For $B^{\pm} \to K^{0}_{S} K^{0}_{S} K^{\pm}$ decays, the measured branching fraction and direct $CP$ asymmetry are $[10.64\pm0.49(stat)\pm 0.44(syst)]\times10^{-6}$ and [$-0.6\pm3.9(stat)\pm 3.4(syst)$] %, respectively. In the absence of a statistically significant signal for $B^{\pm}\to K^{0}_{S} K^{0}_{S} \pi^{\pm}$, we set the 90 % confidence-level upper limit on its branching fraction at $1.14 \times 10^{-6}$.