Recent Results on $ψ(3770)$ Physics at BES

Details Recent Results on $ψ(3770)$ Physics at BES Recent Results on $ψ(3770)$ Physics at BES

2009-05-29

arxiv.org/abs/0905.4820v2

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 0 figures, to appear in the proceedings of 44th Rencontres de Moriond on QCD and High Energy interactions, La Thuile,

Scientific paper

There are about 33, 6.5 and 1.0 pb$^{-1}$ of $e^+e^-$ annihilation data have been taken around the center-of-mass energies of $\sqrt s=$ 3.773 GeV, at $\sqrt s=$ 3.650 GeV and at $\sqrt s=$ 3.6648 GeV, respectively, with the BES-II detector at the BEPC collider. By analyzing these data sets, we have measured the branching fraction for $\psi(3770)\to$ non-$D\bar D$ by several different methods; and have observed an anomalous line shape of $\sigma^{e^+e^-\to{\rm hadrons}}$ in energy region from 3.65 to 3.87 GeV; and have measured the line shapes of the $D^+D^-$, $D^0\bar D^0$ and $D\bar D$ production and together with the ratios of the production rates of $D^+D^-$ and $D^0\bar D^0$ in $e^+e^-$ annihilation around the $\psi(3770)$ resonance.

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