Status | Confirmed |
Seminar Series | SOUTEN-TH |
Subjects | physics |
Date | Friday 4 September 2020 |
Time | 14:00 |
Institute | IPHT |
Seminar Room | Amphi Claude Bloch, Bât. 774 |
Speaker's Last Name | Paul Caucal |
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Speaker's Institution | IPhT |
Title | Jet evolution in a dense QCD medium |
Abstract | To probe the properties of the quark-gluon plasma created in heavy-ion collisions, a very useful class of observables refers to the propagation of energetic jets. A jet is a collimated spray of particles generated via successive parton branchings, starting with a virtual quark or gluon produced by the collision. When such a jet is produced in the dense environment of a nucleus-nucleus collision, its interactions with the surrounding medium lead to a modification of its properties, phenomenon known as jet quenching. In this thesis, we develop a new theory to describe jet quenching. We compute for the first time the effects of the medium on multiple vacuum-like emissions, that is emissions triggered by the virtuality of the initial parton. We present a new physical picture for jet evolution, with notably a factorization in time between vacuum-like emissions and medium-induced emissions. This picture is Markovian, hence well suited for a Monte-Carlo implementation that we develop in the parton shower {\tt JetMed}. We then investigate the phenomenological consequences of our new picture on jet observables and especially the jet nuclear modification factor $R_{AA}$, the SoftDrop $z_g$ distribution and the jet fragmentation function. Our Monte-Carlo results are in good agreement with the LHC measurements. |
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