Charged Hadron Spectra Measurement with the CMS detector in pp collisions at $\sqrt{s} =$ 0.9, 2.36, and 7~TeV

The CMS measurement of the charged hadron pseudorapidity and transverse momentum distributions in minimum bias pp collisions at $\sqrt{s} =$ 0.9, 2.36 and 7~TeV, is presented. The charged hadron yield results were obtained using the inner silicon tracker, by means of 3 different methods : counting the number of reconstructed hits, the number of hit pairs ( tracklet-based algorithm ), and the number of fully reconstructed particle tracks. The obtained data is compared with other experiment results, several Monte-Carlo models and tunes, as well as some current theoretical models.