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 pseudorapiditydistributions 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 December2009. For non-single-diractive interactions, the average charged-hadron transversemomentum is measured to be 0.46 +- 0.01 (stat.) +- 0.01 (syst.) GeV/c at 0.9 TeV and0.50 +- 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 resultsat 2.36 TeV represent the highest-energy measurements at a particle collider to date.