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The jet quenching phenomenon in heavy ion collisions provid es a strong evidence of the modification of parton shower in the quark-gluon plasma (QGP). Jet substructure observables can probe various aspects of the jet formation mechanism. They contai n useful information about the QGP and allow us to study the medium properties in great details. Here we present theoretical calculations of jet shapes and cross sections in proton-proton and lead-lead collisions at the LHC using soft-collinear effective theory, with Glauber gluon interactions in the medium. We find that resumming large logarithms in the jet substructure calcula tion is necessary for precise theoretical predictions. The resummation is performed using renorm alization group evolution between characteristic jet scales. We also find that the medium induc es power corrections to jet shapes. In the end we present the comparison between our calculations w ith the recent measurements at the LHC with very good agreement. Our calculations help initiat e precise jet modification studies in heavy ion collisions.

Towards the Understanding of Jet Substructures and Cross Sections in Heavy Ion Collisions Using Soft-Collinear Effective Theory