Track functions describe the collective effect of the fragmentation of quarks and gluons into charged hadrons, making them a key ingredient for jet substructure measurements at hadron colliders where track-based measurements offer superior angular resolution.
Unlike DGLAP, the evolution of track functions incorporates correlations between final-state hadrons, and is hence non-linear. Following our study on the track function evolution in Mellin space and its application to correlations of charged energy flows, we derive the NLO renormalization of the track functions in momentum space in both
Andrea Pelloni, Tanjona Rabemananjara, Tommaso Giani