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

Abstract

One of the signatures of the strongly interacting medium produced in central PbPb collisions is the suppression of high- p T jets and charged particles . In order to disentangle the initial state and final state effects in heavy ion collisions , the nuclear modification factor of both jets and of charged-particles in pPb ( R pPb ) collisions is presented. The spectra of both jets and charged-particles in pPb collisions at s N N = 5.02 TeV , have been measured with the CMS detector using high statistics samples. The R pPb of charged particles is determined by dividing the measured pPb spectrum by a pp reference spectrum constructed using interpolation methods, or alternatively from PYTHIA simulations.