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Special Seminar: The Soft Substructure of Jets

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Duff Neill, Massachusetts Institute of Technology
When
12 February 2016 from 2:30 PM to 3:30 PM
Where
339 Davey Laboratory
Contact Name
Anna Stasto
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Quantum Chromodynamics (QCD) is the theory of nuclei and their constituents, one of the foundational components of the Standard Model. When probing QCD at high energies in particle collisions, a fundamental feature of the theory is multiple distinct collimated cascades of energetic particles or jets. These cascades are driven by the quasi-conformal nature of QCD at high energies, enhancing the probability to emit radiation from the ultraviolet into the infra-red, until the strongly coupled low energy modes dominate, and all radiation is bound tightly into hadrons. Jet substructure seeks to open up the cascade within the jet, to find good observables of the jet properties that reveal its ultra-violet origins in the energetic collision. I will discuss how substructure factorization techniques open up new pathways to understand the QCD cascade, in particular, how to control observables that become entangled between distinct jet sectors. Finally, I will show how the evolution equations of the QCD cascade are mapped to factorization theorems, ultimately giving an unexpected connection between the forward scattering of nucleons, and fixed angle hard scattering.

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