Feynman-x and transverse-momentum dependence of D+/- and D0, D-bar0 production in 250 GeV pi --nucleon interactions.

We measure the differential cross section with respect to Feynman-κ (κF) and transverse momentum (PT) for charm meson production using targets of Be, Al, Cu, and W. In the range 0.1 < κF < 0.7, dσ/dκF is well fit by the form (1-κF) n wih n=3.9 ± 0.3. The difference between n values for D - and D + is 1.1±0.7. In the lower PT range, < 2GeV, dσ/dP 2 T is well fit by the form exp(-b × P 2 T ) with b = 1.03 ± 0.06 GeV -2 , while in the higher P T range, 0.8 to 3.6 GeV, it is well fit by the form exp(-b' × P T ) with b' = 2.76 ± 0.08 GeV -1