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Department of Physics

Andrew Ivanov

Andrew Ivanov Professor
10 Cardwell Hall
(785) 532-1699
aivanov@phys.ksu.edu
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

Graduate Advisees

  • Gujju Reddy, PhD

Recent Selected Publications

Adam et al. “The CMS Phase-1 Pixel Detector Upgrade”, JINST, 16(2021) P02027.  [link]

Adam et al. “The DAQ and Control System for the CMS Phase-1 Pixel Detector Upgrade”, JINST, 14(2019) P10017. [link]

CMS Collaboration, “Search for Vector-like Quarks in Events with Two Oppositely Charged Leptons and Jets in pp Collisions at √ s = 13 TeV”, Eur. Phys. J. C (2019) 79: 364. [link]

CMS Collaboration, “Search for Vector-like Light-Flavor Quark Partners in Proton-Proton Collisions at √ s = 8 TeV”, Phys. Rev. D 97, 072008 (2018). [link]

CMS Collaboration, “Measurement of the Semileptonic tt¯+ γ Production Cross Section in pp Collisions at √ s = 8 TeV”, JHEP 10 (2017) 006. [link]