Measurements of the Branching Fractions for $\ensuremath{\psi}(3770)\ensuremath{\rightarrow}{D}^{0}{\overline{D}}^{0}$, ${D}^{+}{D}^{\ensuremath{-}}$, $D\overline{D}$, and the Resonance Parameters of $\ensuremath{\psi}(3770)$ and $\ensuremath{\psi}(2S)$

Measurements of the Branching Fractions for $ψ (3770) \to D^{0} {\bar{D}}^{0}$ , $D^{+} D^{-}$ , $D \bar{D}$ , and the Resonance Parameters of $ψ (3770)$ and $ψ (2 S)$

M. Ablikim et al. (BES Collaboration)

Phys. Rev. Lett. 97, 121801 – Published 18 September 2006

Abstract

We measure the branching fractions for $ψ (3770) \to D^{0} {\bar{D}}^{0}$ , $D^{+} D^{-}$ , $D \bar{D}$ , and non- $D \bar{D}$ to be $(46.7 \pm 4.7 \pm 2.3) %$ , $(36.9 \pm 3.7 \pm 2.8) %$ , $(83.6 \pm 7.3 \pm 4.2) %$ , and $(16.4 \pm 7.3 \pm 4.2) %$ , respectively. The resonance parameters of $ψ (3770)$ and $ψ (2 S)$ are measured to be $M_{ψ (3770)} = 3772.2 \pm 0.7 \pm 0.3 MeV$ , $Γ_{ψ (3770)}^{tot} = 26.9 \pm 2.4 \pm 0.3 MeV$ , and $Γ_{ψ (3770)}^{e e} = 251 \pm 26 \pm 11 eV$ ; $M_{ψ (2 S)} = 3685.5 \pm 0.0 \pm 0.3 MeV$ , $Γ_{ψ (2 S)}^{tot} = 331 \pm 58 \pm 2 keV$ , and $Γ_{ψ (2 S)}^{e e} = 2.330 \pm 0.036 \pm 0.110 keV$ . We also measure the light hadron $R$ value to be $R_{uds} = 2.262 \pm 0.054 \pm 0.109$ in the energy region from 3.660 to 3.872 GeV.