Author(s) |
Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.;
Adam, W.; Bergauer, T.; Choudhury, R. K.; Dutta, D.; Kailas, S.; Kataria, S.
K.; Mohanty, A. K.; Pant, L. M.; Shukla, P.; Suggisetti, P.; and
others |
Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at
Ös=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
dNch/dh||h|<0.5=5.78
± 0.01(stat) ± 0.23(syst) for non-single-diffractive events, higher than predicted by commonly used models. The relative increase in charged-particle multiplicity from
Ös=0.9 to 7 TeV is [66.1
± 1.0(stat) ± 4.2(syst)]%. The mean transverse momentum is measured to be 0.545
± 0.005(stat) ± 0.015(syst) GeV/c. The results are compared with similar measurements at lower energies. |