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"Jets and jet substructure for inclusive jet production at the LHC"

Zhongbo Kang, Los Alamos National Laboratory
Wednesday, August 3, 2016 - 2:00pm to 3:00pm
PAT C-421

At present day hadron colliders, collimated jets of hadrons are abundantly produced and a
 large fraction of the currently investigated observables at the Large Hadron Collider (LHC)
 involve jets. The experiments at the LHC measure both the inclusive jet production cross
 sections, as well as a variety of jet substructure observables. Jets and jet substructure
 have emerged as an ideal testing ground to study the fundamental properties of Quantum 
 Chromodynamics (QCD). In this talk, I introduce a new kind of jet functions — called 
 “semi-inclusive jet functions”, which describe the jet initiated by a parton acquiring
 a momentum fraction of the parton energy. I demonstrate that it is these semi-inclusive
 jet functions that are relevant for the calculations of the cross section, as well as the 
 substructure for “inclusive” jet production. Within the Soft Collinear Effective Theory
 (SCET), I show that they follow time-like DGLAP evolution equations, which can be used to 
 perform the small jet radius R resummation. We further discuss the jet substructure using
 hadron distribution inside the jet as a concrete example. Our formalism describes the LHC data 
 very well. I point out the immediate applications for medium modification of jets and jet 
 substructure in heavy ion collisions. This work is closely related to the seminal 
 work by Ellis for exclusive jet production. ​
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