Probing the Quark-Gluon-Plasma with Jets

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Date/Time:Thursday, 10 Dec 2020 from 4:10 pm to 5:00 pm
Location:On Zoom - contact Prof. John Lajoie ( for the Zoom ID
Channel:Nuclear Physics
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Dr. Sebastian Tapia Araya, University of Illinois at Urbana

Relativistic heavy ion collisions, at both the LHC and RHIC, can produce a high temperature deconfined state of strongly interacting nuclear matter, called the Quark Gluon Plasma (QGP). The properties of the QGP can be probed through the measurement of modifications to jet kinematics in heavy-ion collisions compared to proton-proton collisions. Jet quenching measurements provide information about the strength of interactions within the QGP as well as the path length dependence therein. Jet quenching is also expected to depend on the flavor of the fragmenting parton. Studies of jet substructure in Pb+Pb collisions provide information about the mechanisms of jet quenching in nuclear medium, over a wide range of energy scales.
In this seminar we will review the latest Jet measurements done by ATLAS using the sample of 5.02 TeV Pb+Pb data collected in 2018, dijet momentum balance, Jet azimuthal anisotropies, suppression of large-radius Jets and its dependence on substructure, and a discussion of incoming measurement of jet associated to a b-hadron commonly referred as b-jets.
These measurements provide new information about the path-length dependence of jet energy loss within the medium. Also brings new information about the evolution of the parton shower in the medium and tests the sensitivity of the jet quenching to the color coherence effects.