Inclusive distributions of charged hadrons in $pp$ collisions at $\sqrt{s}$ = 0.9 and 2.36~TeV

Abstract

Measurements of inclusive charged-hadron transverse-momentum ($p_T$) and pseudorapidity ($\eta$) distributions are presented for proton-proton collisions at $\sqrt{s}=$~0.9 and 2.36~TeV. For non-single-diffractive interactions, the average $p_T$ of charged hadrons is measured to be $0.46 \pm 0.01$~(stat.)~$\pm$~0.01~(syst.)~GeV/$c$ at 0.9~TeV and $0.50 \pm 0.01$~(stat.)~$\pm$~0.01~(syst.)~GeV/$c$ at 2.36~TeV, for $-2.4<\eta<+2.4$. At these energies, the measured pseudorapidity densities in the central region, $dN_{\rm ch}/d\eta_{-0.5< \eta < 0.5}$, are $3.48 \pm 0.02$~(stat.)~$\pm$~0.13~(syst.) and $4.47 \pm 0.04$~(stat.)~$\pm$~0.16~(syst.), respectively. The results at 2.36~TeV represent the highest-energy measurements ever published at a particle collider at the time of the presentation at the Lake Louise Winter Institute