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arXiv · 1004.0175

Observation of the $Υ(1^3D_J)$ Bottomonium State through Decays to $π^+π^-Υ(1S)$

P. del Amo Sanchez·the BABAR Collaboration
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Abstract

Based on $122\times 10^6$ \ThreeS events collected with the \babar\ detector, we have observed the \OneDJ bottomonium state through the $\ThreeS\to\g\g\OneDJ\to\g\g\pip\pim\OneS$ decay chain.The significance for the $J=2$ member of the \OneDJ triplet is 5.8 standard deviations including systematic uncertainties.The mass of the $J=2$ state is determined to be $10164.5\pm0.8\,\rm{(stat.)}\pm0.5\,\rm{(syst.)}$~\mevcc.We use the $\pip\pim$ invariant mass distribution to confirm the consistency of the observed state with the orbital angular momentum assignment of the \OneDJ.

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P. del Amo Sanchez, the BABAR Collaboration. 2011-01-17. Observation of the $Υ(1^3D_J)$ Bottomonium State through Decays to $π^+π^-Υ(1S)$. https://doi.org/10.1103/physrevd.82.111102

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