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First Observation of Upsilon(1S)to γππ
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First Observation of $\Upsilon(1S)\to \gamma\pi\pi$
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We report on a study of exclusive radiative decays of the Upsilon(1S) resonance collected with the CLEO-II detector operating at CESR. We present the first observation of the radiative decays Upsilon(1S)->gamma pi+pi- and Upsilon(1S)->gamma pi0pi0. For the dipion mass regime m(pipi)>1.0 GeV, we obtain Br(Upsilon(1S)->gamma pi+pi-=(6.3+/-1.2+/-1.3) x 10^(-5), and Br(Upsilon(1S)->gamma pi0pi0=(1.7+/-0.6+/-0.3) x 10^(-5). The observed gamma pipi events are consistent with the hypothesis Upsilon(1S)->gamma f2(1270).
Forward citations
Cited by 1 Pith paper
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$T_{bc\bar s}$ states in the process $\Upsilon \to D^{-} \bar B^{0} D_s^{+}$
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