Search for $B_{s}^{0} \rightarrow \eta^{\prime} X_{s\bar{s}}$ at Belle using a semi-inclusive method

TL;DR

This study conducted the first search for the decay process $B_{s}^{0} ightarrow ext{eta prime} + X_{sar{s}}$ using semi-inclusive methods with Belle data, setting an upper limit on its branching fraction due to no significant signal detection.

Contribution

It introduces a semi-inclusive search approach for the $B_{s}^{0} ightarrow ext{eta prime} + X_{sar{s}}$ decay and provides the first experimental upper limit on its branching fraction.

Findings

No significant signal observed.

Set a 90% CL upper limit on the branching fraction.

Analyzed 121.4 fb$^{-1}$ of Belle data.

Abstract

We report the first search for the penguin-dominated process $B_{s}^{0} \rightarrow \eta^{\prime} X_{s\bar{s}}$ using a semi-inclusive method. A 121.4 $\mathrm{fb}^{-1}$ integrated luminosity $\Upsilon(5S)$ data set collected by the Belle experiment, at the KEKB asymmetric-energy $e^+e^-$ collider, is used. We observe no statistically significant signal and including all uncertainties, we set a 90\% confidence level upper limit on the partial branching fraction at 1.4 $\times$ 10$^{-3}$ for $M(X_{s\bar{s}})$ $\leq$ 2.4 GeV/$c^{2}$.