Key Points Intro Reading Join us in tomorrow’s sessions for the rest of the lesson. Intro to Particle Flow Particle Flow connects information from all CMS subdetectors to form particle trajectories. Particle Flow candidates are labelled as muons, electrons, photons, charged hadrons, and neutral hadrons. When enabled, POET files can contain 4-vector and labelling information for all of the particle flow candidates. Jet substructure Grooming algorithms remove soft and wide angle radiation to bring a jet’s mass closer to that of the parent particle. Substructure algorithms provide information about the number of high-momentum subjets or whether heavy flavor hadrons existed inside the jet. The standard variables needed to tag W, Z, H boson or top quark jets in 2015 data are included in the POET. Glossary FIXME