Observation of psi(3770)--> pi pi J/psi and Measurement of Gamma_{ee}[psi(2S)]

Details Observation of psi(3770)--> pi pi J/psi and Measurement of Gamma_{ee}[psi(2S)] Observation of psi(3770)--> pi pi J/psi and Measurement of Gamma_{ee}[psi(2S)]

2005-08-09

arxiv.org/abs/hep-ex/0508023v3

Phys.Rev.Lett.96:082004,2006

Physics

High Energy Physics

High Energy Physics - Experiment

13 ages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2005/, Submitted to PRL

Scientific paper

10.1103/PhysRevLett.96.082004

We observe signals for the decays psi(3770)--> X J/psi from data acquired with the CLEO detector operating at the CESR e^+e^- collider with sqrt{s}=3773 MeV. We measure the following branching fractions B(psi(3770)--> XJ/psi) and significances: (189 +- 20 +- 20) x 10^-5 (11.6sigma) for X=pi^+pi^-, (80 +- 25 +- 16) x 10^-5 (3.4sigma) for X=pi^0pi^0, and (87 +- 33 +- 22) x 10^-5 (3.5sigma) for X=eta, where the errors are statistical and systematic, respectively. The radiative return process e^+e^- -->gamma psi(2S) populates the same event sample and is used to measure Gamma_{ee}[psi(2S)]=(2.54 +- 0.03 +- 0.11) keV.

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