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Published July 27, 2011 | Published
Journal Article Open

Study of dipion bottomonium transitions and search for the h_b(1P) state


We study inclusive dipion decays using a sample of 108×10^6Υ(3S) events recorded with the BABAR detector. We search for the decay mode Υ(3S)→π^+π^-h_b(1P) and find no evidence for the bottomonium spin-singlet state h_b(1P) in the invariant mass distribution recoiling against the π^+π^- system. Assuming the h_b(1P) mass to be 9.900  GeV/c^2, we measure the upper limit on the branching fraction B[Υ(3S)→π^+π^-h_b(1P)]<1.2×10^(-4), at 90% confidence level. We also investigate the χ_(bJ)(2P)→π^+π^-χ_(bJ)(1P), Υ(3S)→π^+π^-Υ(2S), and Υ(2S)→π^+π^-Υ(1S) dipion transitions and present an improved measurement of the branching fraction of the Υ(3S)→π^+π^-Υ(2S) decay and of the Υ(3S)-Υ(2S) mass difference.

Additional Information

© 2011 American Physical Society. Received 24 May 2011; published 27 July 2011. 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 wish to 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 - Lees2011p15465Phys_Rev_D.pdf


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