Transverse-momentum and pseudorapidity distributions of charged hadrons in pp collisions at sqrt(s)=0.9 and 2.36 TeV

Measurements of inclusive charged-hadron transverse-momentum and pseudorapidity distributions are presented for proton-proton collisions at sqrt(s) = 0.9 and 2.36 TeV. The data were collected with the CMS detector during the LHC commissioning in December 2009. For non-single-diractive interactions, the average charged-hadron transverse momentum is measured to be 0.46 +- 0.01 (stat.) +- 0.01 (syst.) GeV/c at 0.9 TeV and 0.50 +- 0.01 (stat.) +- 0.01 (syst.) GeV/c at 2.36 TeV, for pseudorapidities between -2.4 and +2.4. At these energies, the measured pseudorapidity densities in the central region, dNch=djjj<0.5, are 3.48 +- 0.02 (stat.) +- 0.13 (syst.) and 4.47 +- 0.04 (stat.) +- 0.16 (syst.), respectively. The results at 0.9 TeV are in agreement with previous measurements and con- rm the expectation of near equal hadron production in ppbar and pp collisions. The results at 2.36 TeV represent the highest-energy measurements at a particle collider to date.