First Observations of ϒ(1S)→γπ+π- and ϒ(1S)→γπ+π0π0

CLEO Collaboration

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18 Scopus citations


We report on a study of exclusive radiative decays of the ϒ(1S) resonance collected with the CLEO II detector operating at the Cornell Electron Storage Ring. We present the first observation of the radiative decays ?(1S)→γπ+#x03C0;- and ϒ(1S)→ γ #x03C0;0#x03C0;0. For the dipion mass regime m#x03C0;#x03C0; > 1.0 GeV we obtain B(ϒ(1S)→ γ#x03C0;+#x03C0;-)=(6.3±1.2±1.3)×10-5 and B(ϒ(1S)→ γ#x03C0;0#x03C0;0)=(1.7±0.6±0.3)×10-5.

Original languageEnglish (US)
Pages (from-to)286-290
Number of pages5
JournalPhysical review letters
Issue number2
StatePublished - 1999
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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