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Measurements of the cross-sections for e+ e- ---> hadrons at 3.650-GeV, 3.6648-GeV, 3.773-GeV and the branching fraction for psi(3770) ---> non - D anti-D

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May, 2006
11 pages
Published in:
  • Phys.Lett.B 641 (2006) 145-155
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Abstract:
Using the BES-II detector at the BEPC Collider, we measured the lowest order cross sections and the RR values (R=σe+e−→hadrons0/σe+e−→μ+μ−0R=\sigma^0_{e^+e^- \to {\rm hadrons}}/\sigma^0_{e^+e^- \to \mu^+\mu^-}) for inclusive hadronic event production at the center-of-mass energies of 3.650 GeV, 3.6648 GeV and 3.773 GeV. The results lead to Rˉuds=2.224±0.019±0.089\bar R_{uds}=2.224\pm 0.019\pm 0.089 which is the average of these measured at 3.650 GeV and 3.6648 GeV, and R=3.793±0.037±0.190R=3.793\pm 0.037 \pm 0.190 at s=3.773\sqrt{s}=3.773 GeV. We determined the lowest order cross section for ψ(3770)\psi(3770) production to be σψ(3770)B=(9.575±0.256±0.813) nb\sigma^{\rm B}_{\psi(3770)} = (9.575\pm 0.256 \pm 0.813)~{\rm nb} at 3.773 GeV, the branching fractions for ψ(3770)\psi(3770) decays to be BF(ψ(3770)→D0Dˉ0)=(48.9±1.2±3.8)BF(\psi(3770) \to D^0\bar D^0)=(48.9 \pm 1.2 \pm 3.8)%, BF(ψ(3770)→D+D−)=(35.0±1.1±3.3)BF(\psi(3770) \to D^+ D^-)=(35.0 \pm 1.1 \pm 3.3)% and BF(ψ(3770)→DDˉ)=(83.9±1.6±5.7)BF(\psi(3770) \to D\bar{D})=(83.9 \pm 1.6 \pm 5.7)%, which result in the total non-DDˉD\bar D branching fraction of ψ(3770)\psi(3770) decay to be BF(ψ(3770)→non−DDˉ)=(16.1±1.6±5.7)BF(\psi(3770) \to {\rm non}-D\bar D)=(16.1 \pm 1.6 \pm 5.7)%.
  • electron positron: colliding beams
  • electron positron: annihilation
  • hadron: multiple production
  • cross section: hadronic
  • energy dependence
  • psi(3770): electroproduction
  • psi(3770): hadronic decay
  • D: pair production
  • psi(3770): branching ratio
  • BES
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