Jet Substructure @ the LHC - from Boosted to Bread & Butter Particle Physics

by Dr Tuhin Roy (University of Washington)

Tuesday 16 Apr 2013, 16:00 → 17:00 Asia/Kolkata

AG69 (Colaba Campus)

Jets are outputs of clustering algorithms that group the energy cells of the calorimeter components of a detector in a well-defined way. After a brief introduction, I will review selected new ideas in jet physics. In the first part, I will discuss how the use of a non-deterministic jet-algorithm can render stability to jet observables. In the second part, I will introduce a new proposal where jets become a superset of both traditional objects such as QCD-jets, photons, and electrons, and more unconventional objects such as photon-jets and electron-jets, defined as collinear photons and electrons, respectively. Since standard objects such as single photons become a subset of jets in this approach, standard jet substructure techniques are incorporated into the photon finder toolbox. I demonstrate that, for a single photon identification efficiency of 80% or above, the use of jet substructure techniques reduces the number of QCD-jets faking photons by factors of 2.5 to 4.