First Results from CLEO-c at E_cm=Psi(3770)

Abstract

The CLEO-c detector at CESR has begun to collect large data sets of $e^{+}{e}^{-}\to c\bar{c}$ events in the center-of-mass energy range $\sqrt{s}=3-5$GeV that will greatly enhance the size of the world's data sets of events produced at charm threshold. Preliminary results for the pseudoscalar decay constant $f_{D^{+}}$ and absolute D-meson hadronic branching fractions from an initial integrated luminosity $\mathcal{L}=57\mathrm{p}{\mathrm{b}}^{-1}$ collected at $\sqrt{s}=\Psi (3770)$ are described. These charm measurements are also relevant for B physics.

7 pages, 5 figures, 2 tables. Presented at the 5th Rencontres du Vietnam, 5-11 Aug 2004, Hanoi