Measurement of sigma(e+e- --> psi(3770) --> hadrons) at Ecm=3773 MeV
Besson, D.
Original · EN
We measure the cross section for e+e- -> ψ(3770) -> hadrons at Ecm=3773 MeV to be (6.38+-0.08⁺⁰.⁴¹₋₀.₃₀) nb using the CLEO detector at the CESR e+e- collider. The difference between this and the e+e- -> ψ(3770) -> DD-bar cross section at the same energy is found to be (-0.01+-0.08⁺⁰.⁴¹₋₀.₃₀) nb. With the observed total cross section, we extract Γₑe(ψ(3770))=(0.204+-0.003⁺⁰.⁰⁴¹₋₀.₀₂₇) keV. Uncertainties shown are statistical and systematic, respectively.
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