Evidence of psi(3770) non-DD-bar Decay to J/psi pi+pi-

Abstract

Evidence of $\ddot{I}ˆ(3770)$ decays to a non-$D\bar{D}$ final state is observed. A total of $11.8\pm 4.8\pm 1.3$ $ψ(3770) \to \PPJP$ events are obtained from a data sample of 27.7 $\mathrm{p}{\mathrm{b}}^{-1}$ taken at center-of-mass energies around 3.773 GeV using the BES-II detector at the BEPC. The branching fraction is determined to be $BF(ψ(3770) \to \PPJP)=(0.34\pm 0.14 \pm 0.09)%$, corresponding to the partial width of $Γ(ψ(3770) \to \PPJP) = (80 \pm 33 \pm 23)$ keV.

8 pages, 7 figures, Submitted to Physics Letters B