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

CLEO Collaboration

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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
Pages (from-to)286-290
Number of pages5
JournalPhysical Review Letters
Issue number2
Publication statusPublished - 1999 Jan 1


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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