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Department of Physics

Andrew Ivanov

Andrew IvanovAssociate Professor
10 Cardwell Hall
(785) 532-1699
Group Webpage

Ph.D. University of Rochester, 2004
M.S.   Moscow Institute of Physics & Technology, 1998

Research Area

Experimental High Energy Particle Physics
  • Top Quark Physics
  • Searches for New Particles and Phenomena
  • Particle Detector Development

I study physics of elementary particles and their interactions using data from proton-proton collisions, collected with the Compact Muon Solenoid (CMS) detector at the Large Hadron Collider (LHC). My research is focused on resolving the mass hierarchy problem in particle physics. Theoretical predictions indicate that the recently discovered Higgs boson partially obtains its mass from interactions with other particles, mainly from the top quark, which seems to play a special role in the standard model of particle physics. The Higgs mass would be substantially larger than what was observed, unless some other particles in Nature exist that cancel out the contributions from the top quark. I search for a partner of the top quark, which is expected to stabilize the Higgs boson mass on the electroweak scale. 

My research group searches for both fermion and boson partners of the top quark using LHC data. The fermion partner appears in models predicting that a Higgs is a composite particle, as well as in models with extra dimensions; the boson partner is a particle predicted in super-symmetric extensions of the standard model.  

My group is also active in the CMS pixel detector upgrade. The KSU team of graduate and undergraduate students performed production testing of the upgraded version of the Token Bit Manager (TBM) chip. This is a chip that is utilized for reading the silicon pixel hit data from charged tracks traversing layers of the pixel detector. Using engineering support from the KSU-Electronics Design Lab, we also developed firmware and software for the electronic board (Front-End-Controller) processing the data further down-stream, and allowing to control the TBM chip and pixel read-out chips remotely. 

We are currently involved in the installation and commissioning of the Phase 1 pixel detector, and also started R&D for the Phase 2 pixel detector, which will be developed for the high-luminosity data taking in 2020s.

Research Support

  • Department of Energy (Early Career Award)
  • National Science Foundation

Recent Selected Publications

S. Chatrchyan et al. [CMS Collaboration] (2016). Search for R-parity violating decays of a top squark in proton-proton collisions at √ s = 8 TeVPhysics Letters B, 760 (10), 178.   

S. Chatrchyan et al. [CMS Collaboration] (2016).  Search for pair-produced vectorlike B quarks in proton-proton collisions at √ s = 8 TeV. Physical Review D, 93, 112009.  

V. Khachatryan et al. [CMS Collaboration] (2016). Search for vectorlike charge 2/3 T quarks in proton-proton collisions at √ s = 8 TeVPhysical Review D, 93, 012003.   

S. Chatrchyan et al. [CMS Collaboration] (2015). Search for stealth supersymmetry in events with jets, either photons or leptons, and low missing transverse momentum in pp collisions at 8 TeVPhysics Letters B, 743, 503.

S. Chatrchyan et al. [CMS Collaboration] (2012). Observation of a new boson at a mass of 125 GeV with  the CMS experiment at the LHC. Physics Letters B, 716(1), 30. 

Full Publication List (Google Scholar)