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02/28/2020 Interview > Faculty > 우수연구자


[HY's Excellence] A Researcher at the Forefront of Particle Physics, Leading the CMS Experiments

Professor Tae Jeong Kim ( Department of Physics )


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Professor Tae Jeong Kim is a professor of the Department of Physics at Hanyang University and a chairman on the board of the CMS RPC Institute (CERN). For the past few years, Professor Kim has been conducting in-depth research with a compact muon solenoid (CMS) detector to study the smallest particle on Earth and its origin through a coupling with the Higgs particle including Top Quark, and to review the validity of the standard models, in cooperation with more than 200 universities from more than 40 countries.
His academic depth and passion to discover how the world was formed and how particles interact led him to the field of particle physics which focuses on dividing particles, the basis of our existence, in order to test their limits and study their interactions. “Our lab deals with basic particles which cannot be further divided. It is basically tracing the activities of basic particles.” He continued his detailed explanation full of passion about particle physics. “I was the first person to publish on the topic of simultaneous creation of two top quarks and two bottom quarks. We identified the process of measuring the levels of interaction between top quarks and Higgs particles in 2015, and we released another paper in 2018 with updated content. Back in 2015, there was no ongoing discussion about this topic.” Professor Kim added that such research will help him find a way to verify the standard model in a variety of ways.
Since coming to Hanyang University, he has played an important role in helping Hanyang University become an official member of the CMS Research. He secured a positive vote from the institute by presenting the excellence of Hanyang University himself. “In addition to my efforts, students are also taking important positions in CMS Research. That helped me get elected as chairman of the CMS RPC institute, as such provisions were received comprehensively.” He explained that the atmosphere of multiple teams freely discussing their research findings and coordinating on a variety of projects is a great motivation for him. He also shared his wishes to share such an atmosphere with his domestic research colleagues.
Professor Kim has a number of ongoing research projects being conducted with various international research teams. He also noted that he feels the challenges of and necessity for research in new areas alongside with collaboration on the research exchange program funded by National Research Foundation of Korea (NRF) and Research Foundation – Flanders (FWO) in Belgium with the Vrije Universiteit Brussel (VUB) and the cooperative work with the University of Zurich on the differential cross section measurement of the top quark with two additional b jets. Professor Kim projects that the application of a neuromorphic chip will bring about faster and more accurate experiments in experimental environments, where deep learning is a necessity for big data. He expressed his unrelenting desire to continue research saying that he can’t wait to face his colleagues and the scientific community to continue collaborating in this field. Hopefully, the exchange and cultivation of human resources and the depth of research will become even more active, following the wishes of Professor Kim whose specific achievements have led Korea to reach the status of leading research on major topics at CERN, when just 10 years ago it was an outsider of the prestigious group.

  - 2019-present  Chairperson of the CMS RPC Institution Board 

  - 2019-present  Editor of Journal of Korean Physical Society

  - 2018-present  Deputy spokesperson for the Korea-CMS collaboration

  - 2015-present  associate professor, Hanyang University

  - 2014-2015  assistant professor, Chonbuk National University

  - 2013-2014  postdoc, Free University of Brussels (VUB), Belgium

  - 2009-2013  postdoc, Korea-CERN project

  - 2008-2009  postdoc, University of Iowa, USA 

  - 2007  PhD, Korea University 

- Measurement of cross section of the top-quark pair production in association with a pair of bottom quarks : After the Higgs (H) boson discovery in 2012 at the LHC at CERN, from the initial measurements, the properties of the H boson seem to be consistent with those from the H boson in the standard model. Furthermore, from analyzing the proton collision data of the LHC, the couplings of a top quark and a bottom quark in the standard model third generation with the H boson were recently discovered in different processes in 2018. However, the confirmation that both couplings are simultaneously consistent with the predictions is only possibly by measuring the unique process where top-quark pairs are produced in association with the H boson where the H boson decays a pair of bottom quarks. This process is yet to be discovered. In the search for new physics phenomena beyond the stadard model, this first time ever measurement is a vital avenue to discover unknown features, i.e. when the measurement would not agree with the predictions of the standard model. 
- Search for flavor changing neutral current in the top quark sector : Flavor-changing neutral couplings of the top quark to gauge and Higgs bosons are forbidden at tree level and can only appear in loop corrections but suppressed by the Glashow-Iliopoulos-Maiani (GIM) mechanism with the SM branching fraction of 10-15. Since any deviation from the SM would indicate new physics, anomalous interactions of the top quark have been widely searched. In our study, we focus on the flavor-changing neutral Higgs using data collected with the CMS detector at 13 TeV.

“Measurement of the cross section ratio sigma(t-tbar b-bbar)/ sigma(t-tbar jj) in pp collistions at 8 TeV”, CMS collaboration (CERN), 2015  Find more
“A study of top-quark mass measurement using the lepton energy distribution at the Large Hadron Collider”, EPJC, 2017.  Find more
“Measurement of t-tbar cross sections in association with b jets and inclusive jets and their ratio using dilepton final states in pp collisions at 13 TeV”, CMS collaboration (CERN), 2018  Find more
“Search for the flavor-changing neutral current interactions of the top quark and the Higgs boson which decays into a pair of b quarks at 13 TeV”, CMS collaboration (CERN), 2018 Find more
“Correlation between RD* and top quark FCNC decays in leptoquark models”, JHEP, 2019 Find more

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