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Early in the universe, right after the big bang, the temperature is so hot that even hadrons cannot be formed. In this exotic state of matter (the so-called quark-gluon plasma), quarks and gluons are not confined in hadrons. It is an excellent testing ground for the theory of quantum chromodynamics (QCD) under extreme conditions. At ultrarelativistic heavy ion colliders such as RHIC and LHC, tiny droplets of such matter are believed to have been created! And so it is possible to study it in a well-controlled fashion. The study of the quark gluon plasma in colliders is in its relative early stages and there are surprises at every turn. There is a strong exploratory component in many measurements and it is always exciting to open the box on the results. In this talk I will discuss some of the recent exciting new findings on this exotic state of matter, and where we might go from here.
Dr Yi Chen is currently a postdoctoral researcher at MIT. She started my research in CS on pseudo random number generators before joining the heavy ion group at CMS as an undergraduate student. As a PhD student, she was involved in the hadronic calorimeter test beam studies on all-layer readout and SiPM performance studies. She then went on to lead the anomalous signal group to develop noise filters for the collaboration. Analysis-wise she was part of the early Z+jet cross section measurement team, and searched for the 3rd generation leptoquark before finishing up the PhD with the CP measurement of the Higgs boson in the 4l channel with a novel multi-dimensional method that she developed together with Dr Roberto Vega-Morales from the theory side.
She re-joined the heavy ion group as a CERN research fellow and pioneered in jet substructure and performed large-area jet measurements in the heavy ion collisions. She led the CMS jet calibrations group between 2018 and 2019 and later on the CMS heavy ion analysis group until 2021. In addition to other work including coordinating the heavy ion trigger and jet reconstruction efforts inside the CMS collaboration, she is also extracting quark-gluon plasma properties using Bayesian techniques with the JETSCAPE collaboration, as well as jet measurements in e+e- collisions with the archived ALEPH data.