Speaker
Description
Jets on propagating through quark gluon plasma (QGP) - a strongly interacting medium of deconfined quarks and gluons produced in heavy ion collisions, are quenched or modified. One of the manifestations of jet quenching is the increased asymmetry of jet energies between leading and sub-leading jets in back-to-back di-jets. Recent results from CMS [1] suggest that sub-leading jets in asymmetric dijets are subjected to stronger modification presumably because they traverse a longer path-length in QGP. However, this interpretation may not be as straightforward as it seems because of other effects like those due to jet energy loss fluctuations and the jet energy itself. In this work, we therefore perform this analysis for photon-tagged jets where photons can be considered as a reasonable proxy for the initial jet energy, at least to the first order, using a pQCD inspired model for jet energy loss called JEWEL [2]. Thus, upon comparing jet shapes of sub-leading jets between pp and Pb-Pb collisions by sampling events based on the energy imbalance of photon and the recoil jet, it may be possible to study how the energy loss itself affects the modification of jet shapes and put some constraints on the path-length effect as well.
[1] CMS Collaboration, ”In-medium modification of dijets in PbPb collisions at √s_NN = 5.02 TeV”, Journal of High Energy Physics 05, 116 (2021)
[2] K.C. Zapp, F. Krauss and U.A. Wiedemann, ”A perturbative framework for jet quenching”, Journal of High Energy Physics 03, 080 (2013)
| Session | Heavy Ions and QCD |
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