NPA Seminar: Berndt Mueller, Duke/Yale, “What can energy-energy correlators tell us?”

Energy-energy correlators (EEC) have been proposed as new powerful tools to explore the substructure of QCD jets. Compared with other tools that are used to characterize jet substructure they have the advantage of being firmly anchors in QCD, and their scale evolution is well defined and calculable in perturbative QCD. Experimental data indicate a rapid transition from a regime (at large relative angles) that is well described by perturbative parton splitting to a regime (at small relative angles) where the EECs are described by statistical emission of hadrons. What defines the location and width of the transition is an interesting question. There are two obvious mechanisms: (1) Nonperturbative modification of the parton splitting cascade and (2) the parton-hadron transition, i.e. hadronization. I will discuss our attempts to explore the interplay between these two mechanisms in simple models of the transition regime.
Host: John Harris