# Observation of the $\Upsilon(1^3D_J)$ Bottomonium State through Decays to $\pi^+\pi^-\Upsilon(1S)$

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 is 6.2 standard deviations including systematic uncertainties. The mass of the J=2 member of the \OneDJ triplet is determined to be $10164.5\pm0.8 \rm{(stat.)}\pm0.5 \rm{(syst.)}$ \mevcc. We use the $\pip\pim$ invariant mass and decay angular distributions to confirm the consistency of the observed state with the orbital angular momentum and parity assignments of the \OneDJ.
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http://hal.in2p3.fr/in2p3-00473333
Contributor : Swarna Bassava <>
Submitted on : Thursday, April 15, 2010 - 10:37:12 AM
Last modification on : Tuesday, December 22, 2020 - 12:40:02 PM

### Citation

P. del Amo Sanchez, J. P. Lees, V. Poireau, E. Prencipe, V. Tisserand, et al.. Observation of the $\Upsilon(1^3D_J)$ Bottomonium State through Decays to $\pi^+\pi^-\Upsilon(1S)$. Physical Review D, American Physical Society, 2010, 82, pp.111102. ⟨10.1103/PhysRevD.82.111102⟩. ⟨in2p3-00473333⟩

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