Probing the Standard Model with Jet Substructure

Jets, collimated sprays of charged and neutral hadrons, play an important role in the wide physics programme carried out by the ATLAS experiment. They are used to test the predictions of the Standard Model with high precision and to search for exciting new physics phenomena. The energy scale of new physics is however often beyond the reach of particle accelerators like the Large Hadron Collider and the existence of new physics can only be detected indirectly via small quantum loop corrections to the predictions of the Standard Model. These indirect searches can be thought of as searching for a needle in a huge haystack in the sense that the background is several orders of magnitude larger than the exciting signal. Jet substructure techniques have emerged as an essential tool in the suppression of the background in such searches by studying the Internal structure / energy distribution within the jet to gain insights in the jet’s origin. Resolving the inner structure of jets is however extremely challenging especially at high energies. 

This talk provides an introduction in jet substructure techniques and gives an overview of their versatile applications at the Large Hadron Collider ranging from searches for new physics to probing quantum chromodynamics with highest precision. Furthermore, the challenges of such tools are discussed especially with regard to the High-Luminosity LHC.