Charmonium decays of Y(4260), psi(4160) and psi(4040)

Using data collected with the CLEO detector operating at the CESR e+e- collider at sqrt s = 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) --> pi0 pi0 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 sqrt s = 4.26 GeV as sigma(pi+ pi- J/psi) = 58 +12-10 +- 4 pb, sigma(pi0 pi0 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.

Note:

11 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2006/, Submitted to PRL Report-no: CLNS 06/1952, CLEO 06-2 Journal-ref: Phys.Rev.Lett. 96 (2006) 162003

14.40.Gx
13.25.Gv
electron-positron inclusive interactions
psi mesons
meson hadronic decay
electron positron: colliding beams
electron positron: annihilation
charmonium
quarkonium: hadronic decay
quarkonium: branching ratio

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