Speaker
Description
The immense flux of high-momentum jets produced by the LHC provides a unique opportunity to study the detailed dynamics of high-energy QCD. So-called “energy-energy correlator” observables provide a particularly compelling opportunity to uncover these dynamics by probing the internal structure of jets while maintaining a close connection to fundamental ingredients of QCD theory. The bulk scaling properties of 2- and 3-point energy-energy correlators have already been measured by several experiments, but the resolved structure of these observables is still completely unknown. We will discuss the phenomenology of resolved four-point energy-energy correlators, including new experimentally-viable observables and first-principles calculations. We will then proceed to discuss recent measurements of these observables by the CMS experiment in Z+jets events at a center-of-mass energy of 13 TeV. We will further discuss the practical challenges in measuring and unfolding these high-dimensional, highly-correlated data. These results provide a stringent test of parton shower dynamics and QCD factorizations, and provide a basis for new insights into the high-energy dynamics of QCD.