Ia Iashvili, PhD



339A Fronczak Hall
(716) 645-6611
Lab: 342 Fronczak Hall, (716) 645-6294


  • BS, Physics, Tbilisi State University – 1990
  • PhD, Physics, Humboldt University, Berlin – 2000
  • Postdoctoral Research at UC Riverside – 2000-2005

Research Area


Experimental High Energy Physics, Particle Physics

Research Interests

Particle physics studies the basic elements of matter and the interactions among them. It aims to uncover the most fundamental laws that control the make-up of the physical universe. The Standard Model (SM) of particle physics provides theoretical framework describing electromagnetic, weak and strong interactions of the fundamental matter constituents. The legacy of SM rests on a large amount of experimental tests that indicate the couplings of matter particles (fermions: quarks and leptons) and force mediators(bosons) are precisely described by the SM, and confirm that Electroweak (EW) symmetryis preserved. However, it is also clear that this symmetry must be broken, as it forbids masses for all fermions and electroweak bosons. In SM, EW symmetry is broken spontaneously via Higgs mechanism whereby particles acquire masses through their interaction with the Higgs field. The Higgs boson – physical particle associated with the Higgs field – was discovered in 2012 by the Atlas and CMS collaborations at Large Hardon Collider (LHC, CERN). Since its discovery, all measurements of the boson’s properties agree with the SM predictions within their relatively large uncertainties. However, it is not yet known whether the observed boson is solely responsible for EW symmetry breaking, orif it is part of a broader picture of physics beyond the Standard Model. This broader picture can manifest itself through the production of new particles and/or through new types of interactions that are subject of active searches in proton-proton collisions at LHC.

My research program is centered on searches for new particles and new types of interactions at CMS. At the same time, I work on precision measurements of the Standard Model. Tools for testing the SM include hadronic jets which are signatures of quarks and gluons. I have been leading effort for precise calibration of hadronic jets which is imperative for most of the physics measurements at CMS.  Through my students I am engaged in upgrades of the CMS Forward Pixel Detector. CMS Pixel detectors provide charged particle tracking and vertexing capabilities.These are crucial for most of the CMS physics program.

Selected Publications

  • CMS Collaboration, Pileup mitigation at CMS in 13 TeV data, submitted to JINST 15 (2020) P09018
  • CMS Collaboration, Performance of missing transverse momentum reconstruction in proton-proton collisions at √s = 13 TeV using the CMS detector, JINST 14 (2019) P07004
  • CMS Collaboration, Search for resonant ttbar production in proton-proton collisions at √s = 13 TeV, JHEP 04 (2019) 031
  • CMS Collaboration, Search for vector-like T and B quark pairs in final states with leptons at  √s = 13 TeV,  JHEP 08 (2018) 177
  • CMS Collaboration, Jet Energy Scale and Resolution in the 8 TeV pp data, JINST 12 (2017) P02014
  • CMS Collaboration, Search for narrow resonances decaying to dijets in proton-protoncollisions at √s = 13 TeV, PRL 116, 071801 (2016)
  • CMS Collaboration, A search for resonant ttbar production in pp collisions at √s = 8 TeV, PRD 93, 012001 (2016)
  • CMS Collaboration, Search for Z’ Resonances decaying to ttbar in dilepton+jets finalstates in pp collisions at √s = 7 TeV, Phys. Rev. D 87, 072002 (2013)
  • I. Iashvili, S.Jain, A.Kharchilava and H. Prosper, Discovery potential for heavy ttbarresonances in dilepton+jets final states in pp collisions at √s= 14 TeV, Snowmass 2013 Top Quark Working Group report, arXiv:1311.2028 (2013)
  • CMS Collaboration, Observation of a new boson at a mass of 125 GeV with the CMSexperiment at the LHC, Phys. Lett. B 716, 30 (2012)
  • CMS Collaboration, Determination of jet energy calibration and transversemomentum resolution in CMS, J. Instrum. 6 (2011) P11002
  • CMS Collaboration, Search for Dijet Resonances in 7 TeV pp Collisions at CMS,Phys. Rev. Lett. 105, 211801 (2010)
  • CMS Collaboration, Performance of the CMS hadron calorimeter with cosmic raymuons and LHC beam data, J. Instrum. 5 (2010) T03012
  • DØ Collaboration, V.M. Abazov et al., First Study of the Radiation- Amplitude Zeroin Wγ Production and Limits on Anomalous WWγ Couplings at √s = 1.96 TeV, Phys.Rev. Lett. 100, 241805 (2008)
  • DØ Collaboration, V.M. Abazov et al., Observation of ZZ production in ppbarcollisions at √s =1.96 TeV, Phys. Rev. Lett. 101, 171803 (2008)
  • DØ Collaboration, V.M. Abazov et al., ZZ→ llvv production in ppbar collisions at√s =1.96 TeV, Phys. Rev. D 78, 072002 (2008)
  • DØ Collaboration, V.M. Abazov et al., Measurement of the ttbar Production CrossSection in ppbar Collisions at √s = 1.96 TeV, Phys. Rev. Lett. 100, 192004 (2008)