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I develop an Effective Field Theory (EFT) framework to compute jet substructure observables for heavy ion collision experiments.
I consider dijet events that accompany the formation of a Quark Gluon Plasma(QGP) medium in a heavy ion collision and look at the simultaneous measurement of jet mass along with the transverse momentum imbalance between the jets accounting for both vacuum and medium evolution.
Treating the energetic jet as an open quantum system interacting with a QGP bath, I write down a factorization formula within the SCET(Soft Collinear Effective Theory) framework for the reduced density matrix of the jet in the Markovian approximation. This allows a resummation of large logarithms that arise due to the final state measurements imposed while simultaneously summing over multiple interactions of the jet with the medium. I will discuss the novel IR structure of the medium modified jet function that arises in this factorization approach.