Bottomonium studies via Υ(3S) decays. First observation of Υ(1D) states

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Abstract

The CLEO III experiment has recently accumulated a large statistics sample of 4.73 · 106 Υ(3S) decays. We present the first evidence for the production of the triplet Υ(1D) states in the four-photon cascade, Υ(3S) → Υχb(2P), χb(2P) → γΥ(1D), Υ(1D) → γχb(1P), χb(1P) → γΥ(1S), followed by the Υ(1S) annihilation to e+e- or μ+μ-. We have also analyzed two-photon cascades between the triplet S and triplet P states and report improved measurements of the photon energies and transition rates. We have searched for Υ(3S) → γηb(1S) hindered M1 photon transition in inclusive photon spectrum. No evidence for such a transition is found. We set upper limits on the branching ratio, which rule out many previously published phenomenological estimates of the rate for this transition.

Original languageEnglish (US)
Pages (from-to)698-702
Number of pages5
JournalNuclear Physics B - Proceedings Supplements
Volume117
Issue numberSUPPL. 1
DOIs
StatePublished - Apr 2003

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics

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