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Charmonium Decays of Y(4260), psi(4160), and psi(4040) |
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| Authors: | Coan T E Gao Y S Liu F Artuso M Blusk S Butt J Li J Menaa N Mountain R Nisar S Randrianarivony K Redjimi R Sia R Skwarnicki T Stone S Wang J C Zhang K Csorna S E Bonvicini G Cinabro D Dubrovin M Lincoln A Asner D M Edwards K W Briere R A Brock I Chen J Ferguson T Tatishvili G Vogel H Watkins M E Rosner J L Adam N E Alexander J P Berkelman K Cassel D G Duboscq J E Ecklund K M Ehrlich R Fields L Galik R S Gibbons L 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 |
| Institution: | Southern Methodist University, Dallas, Texas 75275, USA. |
| Abstract: | Using data collected with the CLEO detector operating at the CESR e+e- collider at sqrts]=3.97-4.26 GeV, we investigate 15 charmonium decay modes of the psi(4040), psi(4160), and Y(4260) resonances. We confirm, at 11 sigma significance, the BABAR Y(4260)-->pi+pi- J/psi discovery, make the first observation of Y(4260)--> pi(0)pi(0) J/psi (5.1 sigma), and find the first evidence for Y(4260)-->K+K- J/psi(3.7 sigma). We measure e+e- cross sections at sqrts]=4.26 GeV as sigma(pi+pi- J/psi)=58(+12)(-10)+/-4 pb, sigma(pi(0)pi(0) J/psi)=23(+12)(-8)+/-1 pb, and sigma(K+K- J/psi)=9(+9)(-5)+/-1 pb, in which the uncertainties are statistical and systematic, respectively. Upper limits are placed on other decay rates from all three resonances. |
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