Jet Shapes in Hadron Collisions

Jet shapes probe the transition between a parton produced in a hard scattering process and the observed spray of hadrons. Two jet shapes: Angularity and Energy-Energy Correlator Moments are discussed. LO perturbative calculations (with the one-loop strong coupling), including their susceptibility to non-perturbative uniform soft background radiation arising from underlying events and pile-up are worked out from scratch. We come across non-integrable divergences in the process, and we try to gauge the cut-offs required to prevent pQCD from breaking down. PYTHIA8 and FastJet 3 are integrated for simulating and reconstructing jet production at LHC and beyond-LHC energy scales, which shows the contribution of higher order corrections to leading order analytic results.