Observation of $e^+e^-\to\pi^+\pi^-\pi^0\chi_{b1,2}(1P)$ and search for $e^+e^-\to\phi\chi_{b1,2}(1P)$ at $\sqrt{s}=$10.96---11.05 GeV

TL;DR

This study reports the first observation of specific bottomonium-related processes in electron-positron collisions near 11 GeV, providing new insights into bottomonium production and interactions at these energies.

Contribution

First observation of $e^+e^- o ( ext{pi+pi-pi0})_{ ext{non-omega}} ext{chi}_{b1}$ and evidence for $e^+e^- o ext{omega} ext{chi}_{bJ}$ near the $
10$20 resonance, expanding knowledge of bottomonium production channels.

Findings

Observed $( ext{pi+pi-pi0})_{ ext{non-omega}} ext{chi}_{b1}$ with >5.3σ significance.

Evidence for $ ext{omega} ext{chi}_{bJ}$ with >4.0σ significance.

Set upper limits on $ ext{phi} ext{chi}_{bJ}$ cross sections at 90"].0 pb and 1.0 pb.

Abstract

We report searches for the processes $e^+e^-\to\pi^+\pi^-\pi^0\chi_{bJ}$ and $e^+e^-\to\phi\chi_{bJ}$ (J=1,2) based on data samples collected by the Belle experiment at the KEKB collider. We report the first observation of the process $e^+e^-\to (\pi^+\pi^-\pi^0)_{\rm non-\omega}\chi_{b1}$ and first evidence for $e^+e^-\to\omega\chi_{bJ}$ in the vicinity of the $\Upsilon(11020)$ resonance, with center-of-mass energies from 10.96 to 11.05~GeV. The significances for $(\pi^+\pi^-\pi^0)_{\rm non-\omega}\chi_{b1}$ and $\omega\chi_{bJ}$ are greater than $5.3\sigma$ and $4.0\sigma$, respectively. We also investigate the energy dependence of the $e^+e^-\to\pi^+\pi^-\pi^0\chi_{bJ}$ cross section, but we cannot determine whether the contributions are from the $\Upsilon(10860)$ and $\Upsilon(11020)$ resonances or non-resonant continuum processes. The signals for $e^+e^-\to \phi\chi_{bJ}$ are not significant, and the upper limits of the Born cross sections at the 90\% confidence level are $0.7$ and $1.0$~pb for $e^+e^-\to \phi\chi_{b1}$ and $\phi\chi_{b2}$, respectively, for center-of-mass energies from 10.96 to 11.05~GeV.