3:30 pm MCP 201
Any way you slice it: The Lund jet plane as a unique probe of QCD
Jennifer Roloff, Brown University
Jets, or collimated sprays of hadrons produced by quarks and gluons, are a central component of many analyses at collider experiments. Despite their importance, jet formation is notoriously difficult to describe, and mismodeling of this rich structure results in large uncertainties that limit the reach of many analyses relying on jets. The inner structure of jets is a sensitive probe of quantum chromodynamics across a wide range of energy scales, giving insight into the formation and evolution of jets. I will discuss how measurements of jet substructure are being used to better understand jet formation and to provide new tests of our theoretical descriptions of these models. In particular, I will cover how measurements of the Lund jet plane have provided a new framework for testing different theoretical effects. I will then use the example of a recent measurement by the ATLAS experiment of the Lund subjet multiplicity to illustrate how these measurements can provide precision tests of parton shower models, enabling more advanced descriptions of jet formation that will reduce systematic uncertainties for many analyses at the Large Hadron Collider.