Measurement of Absolute Hadronic Branching Fractions of D Mesons and e+e- --> D barD Cross Sections at Ecm = 3773 MeV

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Using 55.8 pb-1 of e+e- collisions recorded at the psi(3770) resonance with the CLEO-c detector at CESR, we determine absolute hadronic branching fractions of charged and neutral D mesons using a double tag technique. Among measurements for three D⁰ and six D+ modes, we obtain reference branching fractions B(D⁰ -> K- pi+)=(3.91 +- 0.08 +- 0.09)% and B(D+ -> K- pi+ pi+)=(9.5 +- 0.2 +- 0.3)%, where the uncertainties are statistical and systematic, respectively. Final state radiation is included in these branching fractions by allowing for additional, unobserved, photons in the final state. Using a determination of the integrated luminosity, we also extract the cross sections sigma(e+e- -> D⁰ D⁰)=(3.60 +- 0.07 +0.07-0.05) nb and sigma(e+e- -> D+D-)=(2.79 +- 0.07 +0.10-0.04) nb.