First observation of theZb0(10610)in a Dalitz analysis ofΥ(10860)→Υ(nS)π0π0
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Abstract
We report the first observation of $\ensuremath{\Upsilon}(10860)\ensuremath{\rightarrow}\ensuremath{\Upsilon}(1,2,3S){\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ decays. The neutral partner of the ${Z}_{b}^{\ifmmode\pm\else\textpm\fi{}}(10610)$, the ${Z}_{b}^{0}(10610)$ decaying to $\ensuremath{\Upsilon}(2,3S){\ensuremath{\pi}}^{0}$, is observed for the first time with a $6.5\ensuremath{\sigma}$ significance using a Dalitz analysis of $\ensuremath{\Upsilon}(10860)\ensuremath{\rightarrow}\ensuremath{\Upsilon}(2,3S){\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ decays. The results are obtained with a $121.4\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected with the Belle detector at the $\ensuremath{\Upsilon}(10860)$ resonance at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider.