Charmonium Decays of Y (4260), ψ(4160), and ψ(4040)
نویسندگان
چکیده
Using data collected with the CLEO detector operating at the CESR e+e− collider at √ s = 3.974.26GeV, we investigate 15 charmonium decay modes of the ψ(4040), ψ(4160), and Y (4260) resonances. We confirm, at 11σ significance, the BaBar Y (4260)→ π+π−J/ψ discovery, make the first observation of Y (4260) → π0π0J/ψ (5.1σ), and find the first evidence for Y (4260) → K+K−J/ψ (3.7σ). We measure e+e− cross-sections at √ s = 4.26GeV as σ(π+π−J/ψ)=58 −10±4 pb, σ(π0π0J/ψ)=23 −8 ±1 pb, and σ(K+K−J/ψ)=9 −5±1 pb, in which the uncertainties are statistical and systematic, respectively. Upper limits are placed on other decay rates from all three
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