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

TL;DR

This paper measures absolute hadronic branching fractions of D mesons and the cross sections for e^+e^- to D barD at 3773 MeV using data from the CLEO-c detector, providing precise reference values.

Contribution

It provides the first precise measurements of D meson branching fractions and cross sections at this energy, including effects of final state radiation.

Findings

Branching fraction B(D^0 -> K^- pi^+) = (3.91 +- 0.08 +- 0.09)%

Branching fraction B(D^+ -> K^- pi^+ pi^+) = (9.5 +- 0.2 +- 0.3)%

Cross sections sigma(e^+e^- -> D^0 ar D^0) = (3.60 +- 0.07 +0.07-0.05) nb

Abstract

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 D^0 and six D^+ modes, we obtain reference branching fractions B(D^0 -> 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^- -> D^0 \bar D^0)=(3.60 +- 0.07 +0.07-0.05) nb and sigma(e^+e^- -> D^+D^-)=(2.79 +- 0.07 +0.10-0.04) nb.