First Observation of $Υ(1S)\to γππ$

Details First Observation of $Υ(1S)\to γππ$ First Observation of $Υ(1S)\to γππ$

1998-07-30

arxiv.org/abs/hep-ex/9807031v1

Phys.Rev.Lett.82:286-290,1999

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, postscript file also available through http://w4.lns.cornell.edu/public/CLNS

Scientific paper

10.1103/PhysRevLett.82.286

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).

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