Using Jet Axis Decorrelation Versus Jet Pseudorapidity to Study Medium Effects in PbPb collisions with CMS

Jet axis decorrelation quantifies the angular distance between the jet axis of two different clustering algorithms used on the same jet constituents. Differences in the jet axis decorrelation for different centrality intervals are evidence for the medium modification of jets and jet substructure. Quark initiated jets are more prevalent than gluon initiated jets in more forward pseudorapidity. Determining jet axis decorrelation across various pseudorapidity ranges enables systematic studies of the impact of a varying population of quark and gluon-initiated jets on this observable. Jet axis decorrelation has been studied for PbPb collisions at a center of mass energy for a binary nucleon nucleon collision of 5.02 TeV. The dataset used has an integrated luminosity of 0.66 $nb^{-1}$, which was collected at the CMS experiment in 2018. Central events have a narrower distribution of jet axis decorrelation, which could be the result of a medium-induced jet substructure modification, or potentially a selection bias caused by jet quenching effects. I will present studies of this jet axis correlation observable versus jet pseudorapidity aiming to disentangle these two effects.