Abstract
Open Charm mesons produced in relativistic nuclear reactions are among themost direct probes to investigate the medium produced in these collisions. It isimportant to measure the production of as many charmed hadrons as possible,such as D0, D+, Ds, D and c. The measurement of their relative yield canprovide information on the hadronization mechanism and is necessary to reducethe systematic error on total charm cross-section. The ALICE experiment at theLHC is designed to perform such measurements at mid-rapidity by means of itsbarrel tracking detectors. The study on exclusive reconstruction of the D0, Ds,and D+ mesons through their hadronic decay channels will be presented for p+pcollisions at 7 TeV. The first results on D-meson spectra and the D+/D0 ratio willalso be shown.1
