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The measurement of the cross-section for charm production in pp collisions atthe LHC is not only a fundamental reference to investigate medium properties inheavy-ion collisions, but also a key test of pQCD predictions in a new energydomain.  The ALICE experiment has measured the D meson production in pp collisions at$\sqrt{s}=7$ TeV. We present the analysis procedure for $\rm D^{0}\to \rmK^{-}\rm \pi^{+}$ and for the calculation of efficiency and acceptancecorrections. Finally, we show the preliminary results on $\rm D^0$ crosssection in pp collisions at $\sqrt{s}=7$ TeV, measured in the region $2<p_{\rmt}<12$ GeV/$c$ at central rapidity $|y|<0.5$. These results are compared toperturbative QCD predictions.

D0 cross section in pp collisions at sqrt{s}=7 TeV, measured with the ALICE experiment