Speaker
Description
Jets, the collimated streams of hadrons resulting from the fragmentation of highly energetic quarks and gluons, are some of the most commonly observed radiation patterns in hadron collider experiments. The distribution of quantum chromodynamic (QCD) radiation within jets is determined by complex processes, the production of showers of quarks and gluons and their subsequent recombination into hadrons. In this talk, two recent measurements of the jet substructure from the ATLAS experiment are presented. The measurements utilise either multijet events or jets produced in the decay of W bosons and the fragmentation of b-quarks in top pair production, using the reconstructed charged particles inside the jet. Presented are measurements of non-perturbative track functions, as well as differential cross-section of Lund sub-jet multiplicities and measurements of the Lund Jet Plane in top quark pair production. The results are compared to a large variety of parton shower models and tunes.
