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Factorization and Resummation for Groomed Multi-Prong Jet Shapes · Around

2017

Factorization and Resummation for Groomed Multi-Prong Jet Shapes

Larkoski, Andrew J., Moult, Ian, Neill, Duff

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Observables which distinguish boosted topologies from QCD jets are playing an increasingly important role at the Large Hadron Collider (LHC).

These observables are often used in conjunction with jet grooming algorithms, which reduce contamination from both theoretical and experimental sources.
In this paper we derive factorization formulae for groomed multi-prong substructure observables, focusing in particular on the groomed $D_2$ observable, which is used to identify boosted hadronic decays of electroweak bosons at the LHC.
Our factorization formulae allow systematically improvable calculations of the perturbative $D_2$ distribution and the resummation of logarithmically enhanced terms in all regions of phase space using renormalization group evolution.

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