Search for transitions from $\Upsilon(4S)$ and $\Upsilon(5S)$ to $\eta_b(1S)$ and $\eta_b(2S)$ with emission of an $\omega$ meson

TL;DR

This study searches for specific bottomonium transitions involving eta_b states and an omega meson but finds no significant signals, setting upper limits on their production cross sections.

Contribution

First search for these specific bottomonium transitions with omega emission, providing upper limits on their cross sections.

Findings

No significant signals observed for the transitions.

Upper limits set on the cross sections: 0.2 pb, 0.4 pb, and 1.9 pb.

Results constrain theoretical models of bottomonium transitions.

Abstract

Using data collected in the Belle experiment at the KEKB asymmetric-energy $e^+e^-$ collider we search for transitions $\Upsilon(4S) \rightarrow \eta_b(1S)\omega$, $\Upsilon(5S) \rightarrow \eta_b(1S)\omega$ and $\Upsilon(5S) \rightarrow \eta_b(2S)\omega$. No significant signals are observed and we set 90\% confidence level upper limits on the corresponding visible cross sections: $0.2 ~\textrm{pb}, 0.4 ~\textrm{pb}$ and $1.9 ~\textrm{pb}$, respectively.