Studies of quark-like and gluon-like contributions to jets using jet charge measurements in pp and PbPb collisions with the CMS experiment

Abstract

The momentum-weighted sum of the electric charges of particles inside a jet, known as jet charge, is sensitive to the electric charge of the hard-scattered parton initiating the jet. Jet charge distributions are presented for PbPb and pp collisions recorded by the CMS detector at √sNN = 5.02 TeV at the LHC. The measurements are unfolded for detector and background effects, and are presented differentially in pT and additionally as a function of the overlap of the colliding Pb nuclei. A template-fitting method is presented to estimate the quark- and gluon-like jet fractions in an inclusive jet sample using jet charge templates from Monte Carlo simulations. The jet charge template-fitting results for quark- and gluon-like jet fractions in pp and PbPb collisions test the color charge dependence of jet energy loss due to interactions with the quark-gluon plasma.