Transverse Momentum and Pseudorapidity Distributions of Charged Hadrons at CMS

Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at $\sqrt{s} = 7$~TeV are measured with the CMS detector at the LHC. The measured charged-hadron multiplicity per unit of pseudorapidity is $dN_{\mathrm{ch}}/d\eta \mid_{\mid\eta\mid < 0.5} = 5.78\pm 0.01~\rm{(stat.)}\pm 0.23~\rm{(syst.)}$ for non-single-diffractive events, higher than predicted by commonly used models. The mean transverse momentum is measured to be $0.545\pm 0.005~\rm{(stat.)}\pm 0.015~\rm{(syst.)}$~GeV/$c$. The results are compared with measurements at lower energies.