Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle II Collaboration, Belle II Collaboration, , ,
| Summary:
We present an analysis of the processes $e^+e^-toetaUpsilon(1S)$,
$etaUpsilon(2S)$, and $gamma X_b$ with
$X_btopi^+pi^-chi_bJ,~chi_bJtogammaUpsilon(1S)$ $(J=1,~2)$
reconstructed from $gammagammapi^+pi^-ell^+ell^-~(ell=e,~mu)$ final
states in $19.6~rm fb^-1$ of Belle II data collected at four energy points
near the peak of the $Upsilon(10753)$ resonance. Here, $X_b$ is a hypothetical
bottomonium-sector partner of the $X(3872)$. A signal of
$e^+e^-toetaUpsilon(2S)$ is observed with a significance greater than
$6.0sigma$. The central value of the Born cross section at 10.653 GeV is
measured to be higher than that at 10.745 GeV, and we find evidence for a
possible new state near $B^*bar B^*$ threshold, with a significance of
$3.2sigma$. No significant signal is observed for
$e^+e^-toetaUpsilon(1S)$ or $gamma X_b$. Upper limits on the Born cross
sections for the processes $e^+e^-toetaUpsilon(1S)$ and
$e^+e^-togamma X_b$ with $X_btopi^+pi^-chi_bJ$ are determined.
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