Inclusive charm cross sections in 800 GeV pp interactions

We report a measurement of the inclusive D/D̅ production cross section in 800 GeV/c proton-proton interactions. The experiment used the high resolution bubble chamber LEBC exposed to an 800 GeV/c proton beam at the Fermilab MPS. We obtain σ(D/D̅) = 59+22-15 μb (statistical errors), having analysed 25% of the total data sample. Comparison with 400 GeV/c pp dat a obtained with LEBC at CERN shows a D/D̅ cross section increase by a factor of 1.7-0.5+0.7. This is in good agreement with fusion model calculations