University of Connecticut

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Particle, Astrophysics, and Nuclear Physics Seminar

Friday, February 10, 2017
2:00pm – 3:00pm

Storrs Campus
Physics Building, P121

Dr. Duff Neill, Los Alamos National Laboratory

The Substructure of Jets

The field of jet substructure has rapidly developed over the last few years in order to maximize the use of the data recorded at the Large Hadron Collider. This has forced QCD theorists to think hard about the structure of the QCD cascade to find observables which can discriminate between hadronically decaying color singlet states from the QCD background. After giving an introduction to Soft-Collinear Effective Field Theory and the ideas behind factorization theorems, I will explain how effective field theory and the use of power counting gives an intuitive way to organize the phase space for the QCD cascade. The mode decomposition and power counting of the EFT breaks up the phase-space into regions where one can use factorization theorems to resum the perturbation series for both signal and background distributions, leading to reliable predictions for discrimination. Beyond their phenomenological utility, such substructure factorization theorems can in turn be used to illuminate the formal structure of the perturbation series for more inclusive observables, allowing one to demonstrate emergent phenomena in jet dynamics. Such phenomena is not captured when using standard fixed-order perturbation theory, leading to a finite radius of convergence for even the leading logarithmic series.


Gerald V. Dunne

Physics Department (primary)

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