  We present results on the production of high transverse momentum charm mesons
in collisions of 515 GeV/c negative pions with beryllium and copper targets.
The experiment recorded a large sample of events containing high transverse
momentum showers detected in an electromagnetic calorimeter. From these data, a
sample of charm mesons has been reconstructed via their decay into the fully
charged K pi pi mode. A measurement of the single inclusive transverse momentum
distribution of charged D mesons from 1 to 8 GeV/c is presented. An
extrapolation of the measured differential cross section yields an integrated
charged D cross section of 11.4+-2.7(stat)+-3.3(syst) microbarns per nucleon
for charged D mesons with Feynman x greater than zero. The data are compared
with expectations based upon next-to-leading order perturbative QCD, as well as
with results from PYTHIA. We also compare our integrated charged D cross
section with measurements from other experiments.
