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

TL;DR

This paper reports initial results from the CLEO-c experiment at the Psi(3770) resonance, measuring charm meson decay constants and branching fractions to improve understanding of charm and B physics.

Contribution

First measurements of D meson decay constants and branching fractions at the charm threshold energy from CLEO-c data.

Findings

Measured D+ decay constant f_D+

Determined D-meson hadronic branching fractions

Collected 57 pb^-1 data at 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 ${\cal L}=57 {\rm pb^{-1}}$ collected at $\sqrt{s}=\Psi(3770)$ are described. These charm measurements are also relevant for B physics.