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Observation of psi(3770) --> pi pi J/psi and measurement of Gamma ee[psi(2S) |
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| Authors: | Adam N E Alexander J P Berkelman K Cassel D G Crede V Duboscq J E Ecklund K M Ehrlich R Fields L Galik R S Gibbons L Gittelman B Gray R Gray S W Hartill D L Heltsley B K Hertz D Jones C D Kandaswamy J Kreinick D L Kuznetsov V E Mahlke-Krüger H Meyer T O Onyisi P U E Patterson J R Peterson D Phillips E A Pivarski J Riley D Ryd A Sadoff A J Schwarthoff H Shi X Shepherd M R Stroiney S Sun W M Urner D Wilksen T Weaver K M Weinberger M Athar S B Avery P Breva-Newell L Patel R Potlia V Stoeck H Yelton J Rubin P Cawlfield C Eisenstein B I Gollin G D Karliner I Kim D Lowrey N Naik P Sedlack C Selen M |
| Affiliation: | Cornell University, Ithaca, New York 14853, USA. |
| Abstract: | We observe signals for the decays psi(3770) --> XJ/psi from data acquired with the CLEO detector operating at the CESR e+ e- collider with square root of s = 3773 MeV. We measure the following branching fractions Beta(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 = pi0 pi0, 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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