High Energy Theory Seminar

Jets are particularly interesting probes to study the formation and evolution of quark-gluon plasma, as created in heavy ion collisions. In this talk I will briefly review attempts to describe the jet evolution in holography, and will argue that essential progress can be made by studying also the substructure of the jet, in particular the evolution of the opening angle. This is illustrated in a simple holographic model, where we start with energy and angular distributions from pQCD. We identify two competing effects: (1) all individual jets become wider, and (2) the distribution of final jets becomes narrower, since narrow jets suffer less energy loss and are thereby more likely to survive. Both effects can be visible in experimental data.