Jet and charged hadron nuclear modification factors in pPb and PbPb collisions with CMS

One of the signatures of the strongly interacting medium produced in central PbPbcollisions is the suppression of high-$p_{\rm T}$ jets and charged particles. Inorder to to disentangle the initial state and final state effects in heavy ioncollisions, the nuclear modification factor of both jets and of charged-particlesin pPb ($R_{\rm pPb}$) and PbPb ($R_{\rm PbPb}$) collisions are presented. Thespectra of both jets and charged-particles in pp collisions at $\sqrt{s} = 2.76$,PbPb collisions at $\sqrt{s_{_{NN}}} = 2.76$ TeV, and pPb collisions at$\sqrt{s_{_{NN}}} = 5.02$ TeV, have been measured with the CMS detector using highstatistics samples. The $R_{\rm pPb}$ of charged particles is determined bydividing the measured pPb spectrum by a pp reference spectrum constructed usinginterpolation methods, or alternatively from PYTHIA simulations.