Transverse-momentum and pseudorapidity distributions of charged hadrons in $pp$ collisions at $\sqrt{s}=7$ TeV

Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at $\sqrt{s} = 7$~TeV are measured with the inner tracking system of the CMS detector at the LHC. The charged-hadron yield is obtained by counting the number of reconstructed hits, hit-pairs, and fully reconstructed charged-particle tracks. The combination of the three methods gives a charged-particle multiplicity per unit of pseudorapidity \dnchdeta$|_{|\eta| < 0.5} = 5.78\pm 0.01\stat\pm 0.23\syst$ for non-single-diffractive events, higher than predicted by commonly used models. The relative increase in charged-particle multiplicity from $\sqrt{s} = 0.9$ to 7~TeV is $66.1\%\pm 1.0\%\stat\pm 4.2\%\syst$. The mean transverse momentum is measured to be $0.545\pm 0.005\stat\pm 0.015\syst\GeVc$. The results are compared with similar measurements at lower energies.