Jet Quenching and Jet Substructure: Theoretical Paradigm

The strong suppression of QCD jets observed at RHIC and the LHC is regarded as a strong evidence of the creation of the quark gluon plasma (QGP) in heavy ion collisions. Jet quenching is a result of multiple-partonic energy loss which cause a substantial modification of the jet substructre. Today jets are extensively studied in heavy ion collisions not only to probe the transport properties of the QGP but also to investigate the non-equilibrium QCD dynamics and uncover the mechanisms of energy transport from high energy jet particles down to the plasma temperature where its is dissipated. In this talk, I will review recent progress in jet quenching theory and associated emergent phenomena such as color decoherence, turbulent energy trasnport and anomalous diffusion in QCD matter. I will also discuss what we can learn from jet substructure studies that provide a multi-dimensional tool to tackle the physics of jet modification and thermalization in hot QCD matter.