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Jets and the Quark Gluon Plasma: This time with greater precision

KMI Theory Seminar
2016-03-16 15:00
Abhijit Majumder
KMI Science Symposia (ES635)
The study of the Quark Gluon Plasma (QGP), the hottest form of matter ever created in a laboratory, has reached a new era of precision. The QGP is now routinely produced and studied in heavy-ion collisions at the Relativistic Heavy-Ion Collider (RHIC), and at the Large Hadron Collider (LHC). High energy jets, which over time have become a tool of studying precision aspects of QCD in proton-proton collisions, now offer a unique probe of the QGP in heavy-ion collisions. These jets, with energies that are orders of magnitude above that in the QGP, traverse the entire space-time extent of the expanding exploding QGP and are strongly modified by their passage. This modification offers a window into the internal degrees of freedom that manifest in the strongly interacting plasma (which is still unknown at this time).
  However, the use of jets for such a purpose requires some care. Jets are multi-scale probes where the interaction of the jets with the medium and the resolution of the medium by the jets changes with time, as the jets propagate through the plasma. One needs to set up a comprehensive framework to study and extract properties of the plasma using these complicated evolving probes. I will touch on various aspects of this science, and highlight recent developments that have occurred in the field, including the new effort to study jet modification in the controlled theoretical environment of Lattice QCD.