Search for the decay $B_s^0 \to \eta^\prime K_S^0$

TL;DR

This paper reports the first search for the decay $B_s^0 o   K_S^0$ using Belle data, finding no signal and setting an upper limit on its branching fraction.

Contribution

First experimental search for the decay $B_s^0 o   K_S^0$ and establishment of an upper limit on its branching fraction.

Findings

No signal observed for the decay.

Set a 90% confidence upper limit of $8.16 imes 10^{-6}$ on the branching fraction.

Utilized 121.4 fb$^{-1}$ of data at the $(5S)$ resonance.

Abstract

We report the results of the first search for the decay $B_s^0 \to \eta^\prime K_S^0$ using $121.4\,{\rm fb}^{-1}$ of data collected at the $\Upsilon(5S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. We observe no signal and set a 90\% confidence-level upper limit of $8.16 \times 10^{-6}$ on the $B_s^0 \to \eta^\prime K_S^0$ branching fraction.