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Published December 1, 2010 | Published
Journal Article Open

Observation of the Υ(1^3D_J) bottomonium state through decays to π^+π^-Υ(1S)


Based on 122 × 10^6Υ(3S) events collected with the BABAR detector, we have observed the Υ(1^3D_J) bottomonium state through the Υ(3S)→ γγΥ(1^3DJ)→ γγπ^+π^-Υ(1S) decay chain. The significance for the J=2 member of the Υ(13DJ) triplet is 5.8 standard deviations including systematic uncertainties. The mass of the J = 2 state is determined to be 10 164.5 ± 0.8(stat)± 0.5(syst)  MeV/c^2. We use the π^+π^- invariant mass distribution to confirm the consistency of the observed state with the orbital angular momentum assignment of the Υ(1^3DJ).

Additional Information

© 2010 American Physical Society. Received 31 March 2010; published 22 December 2010. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (USA), NSERC (Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MEC (Spain), and STFC (United Kingdom). Individuals have received support from the Marie Curie EIF (European Union) and the A. P. Sloan Foundation.

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Published - Sanchez2010p13156Phys_Rev_D.pdf


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