Title: Jet energy loss in hot QCD media
HEP May10 flyer
Abstract: The most important discovery of heavy ion programs at RHIC and the LHC is that a deconfined matter behaving as a perfect liquid is created in ultra-relativistic heavy ion collisions (HIC). Jets provide an important diagnostic tool for understanding this new state of matter and QCD dynamics at high energy and high parton densities. In effect, the strong interactions resulting from the presence of this medium in the final state is responsible for the strong quenching and modification of high energy jets in HIC.
In this talk, I will discuss recent theoretical developments of the theory of jet quenching at weak coupling. I will show in particular that medium-jet interactions lead to the formation of a turbulent gluon cascade that transports energy from high energy forward partons to large angles and soft particles. Then, I will show that, to Double Logarithmic accuracy, radiative corrections to jet quenching observables are universal and can be absorbed in a renormalization of the jet quenching parameter without altering the classical branching picture.
Finally, I will address the problem of radiative energy loss of two-prong jet substructures as a first step toward understanding the interplay and interferences between collimated vacuum parton showers and large angle medium-induced gluon cascades. I will then make modest contact with the recent measurement of the splitting function by the CMS collaboration.