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semanticscholar（2008）
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Abstract
We report on a study of exclusive radiative decays of the Υ(1S) resonance collected with the CLEO II detector operating at CESR. We present the first observation of the radiative decays Υ(1S)→ γππ and Υ(1S)→ γππ. For the dipion mass regime mππ >1.0 GeV we obtain B(Υ(1S)→ γπ π)=(6.3 ± 1.2±1.3)×10 and B(Υ(1S)→ γππ)=(1.7±0.6±0.3)×10 . The observed γππ events are consistent with the hypothesis Υ(1S)→ γf2(1270). Typeset using REVTEX
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