Jul 16 – 21, 2017
Embassy Suites Buffalo
US/Eastern timezone

Jet Fragmentation and Fractal Observables

Jul 17, 2017, 4:30 PM
Embassy Suites Buffalo

Embassy Suites Buffalo

200 Delaware Avenue Buffalo, NY 14202


Benjamin Elder (Massachusetts Institute of Technology)


I will discuss fractal jet observables, which are collinear-unsafe but can be described by generalizing the formalism of fragmentation functions. Generalized fragmentation functions (GFFs) are nonperturbative objects with a calculable RG running. In contrast to the linear DGLAP equations for ordinary fragmentation functions, GFFs evolve nonlinearly, since they encode correlations among subsets of hadrons in a jet. I review some special cases of generalized fragmentation functions already in the literature, including jet charge and track functions. I then present new fractal observables based on hierarchical clustering trees, which exhibit promising performance for discriminating quark jets from gluon jets.

Primary authors

Benjamin Elder (Massachusetts Institute of Technology) Jesse Thaler (MIT) Wouter Waalewijn (University of Amsterdam) Massimiliano Procura (CERN) Mr Kevin Zhou (MIT)

Presentation materials