Search for the decay $B^0_s \rightarrow \pi^0 \pi^0$ at Belle

TL;DR

This paper reports the first search for the rare decay $B_s^0 ightarrow $ using Belle data, setting an upper limit on its branching fraction due to no observed signal.

Contribution

It presents the first experimental search for the decay $B_s^0 ightarrow $ and establishes an upper limit on its branching fraction.

Findings

No signal observed for $B_s^0 ightarrow $ decay.

Set a 90% confidence level upper limit of $7.7 imes 10^{-6}$ on the branching fraction.

Utilized 121.4 fb$^{-1}$ of data at the $$ resonance.

Abstract

We report the results of the first search for the decay $B_s^0\rightarrow\pi^0\pi^0$ using $121.4\ \rm fb^{-1}$ of data collected at the $\Upsilon(5\rm S)$ 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 $7.7\times 10^{-6}$ on the $B_s^0\rightarrow\pi^0\pi^0$ decay branching fraction.