The Compact Muon Solenoid (CMS) experiment is one of two particle detectors that are built on the Large Hadron Collider (LHC) at CERN located in Switzerland and France. Main purpose of the CMS experiment is to detect elementary particles and search for new physics phenomenology. CMS is an international collaboration where the high energy group in Hanyang University has an important participation. Our group is interested in top quark physics and searching for beyond standard model through top quark decay and production using CMS detector at the LHC. Discovering BEH boson (Higgs boson or Scalar boson) allows us to open new windows towards solving many unanswered questions such as the unification of forces or dark energy in the Universe. Top quark is still believed to be the key which will give us hints in this journey. Data at 13 TeV proton-proton collision energy which is the highest energy ever is being collected starting in 2015. Exciting time is just ahead of us.
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