Leading charged particle and jet cross sections at small transverse momenta in pp collisions at $\sqrt{s}$~=~8~TeV in CMS

The production yields of leading charged-particle jets and charged particles in proton-proton collisions are measured at $\sqrt{s} = 8$~TeV based on a data sample collected with the CMS detector and corresponding to an integrated luminosity of 45~$\mu$b$^{-1}$. The charged-particle jets (charged particles) are measured in the pseudorapidity range $\lvert \eta \rvert < 1.9\, (2.4)$ for transverse momenta $p_T > 1\, (0.8)$~GeV. The measured yields integrated above a given minimum transverse momentum $p_{T,min}$ provide information on the mechanism by which the underlying parton-parton cross sections are unitarised approaching the low-$p_T$ non-perturbative domain. Predictions obtained from various Monte Carlo event generators are compared to the measurements. A large model sensitivity is seen.