Dr. Peter Loch, Department of Physics, University of Arizona & CERN
When
Where
Abstract: The final state of the two protons colliding at the Large Hadron Collider (LHC) at CERN, Geneva, Switzerland, often contains collimated bundles of particles ("jets") resulting from the fragmentation or decay of elementary particles which are not directly observable in any detector. The determination of the specific origin of these jets significantly increases the physics potential of the LHC, and the detailed study of the energy flow patterns within jets can be key to that determination. In this talk, we first introduce the principal features of the proton-proton collisions at the high center-of-mass energies at LHC (up to 13 TeV). Important phenomenological aspects of jet reconstruction are discussed together with the most relevant analysis techniques to uncover their substructure. Next, we review the experimental challenges introduced by the collision environment at the LHC and by the finite capabilities of the detectors in the ATLAS experiment. This is followed by the presentation of selected latest results of some of the most challenging jet measurements performed by ATLAS so far. Among those are the measurement of the jet mass and its comparison to the highest precision calculations from Standard Model theory (QCD) available, and the first ever measurement of the extracted two-dimensional radiation pattern inside jets. The talk concludes with a few recent examples of the application of jet substructure techniques to increase the sensitivity in searches for new physics beyond the Standard Model.
Zoom link:https://arizona.zoom.us/j/515661458