Jun Guo Associate Professor
  • Institute of Nuclear and Particle Physics
  • Experimental High Energy Physics; Collider Physics; Detector R&D
  • 021-54748990
  • Room 630, No. 5 Science Building
  • jun.guo@sjtu.edu.cn

Tenured Associate Professor, Shanghai Jiao Tong University, Shanghai, China, Jan. 2022 – present

Tenure-track Associate Professor, Shanghai Jiao Tong University, Shanghai, China, Nov 2014 – 2021

Postdoctoral Research Fellow, Columbia University, New York, USA, Oct 2009 – Sept 2014

Ph.D. in Physics, State University of New York, Stony Brook, New York, USA, 2004-2009

M.S. in Physics, State University of New York, Stony Brook, New York, USA, 2002-2004

B.S. in Physics, University of Science & Technology of China, Hefei, China, 1997-2002

I have been doing research in experimental particle physics, in particular collider physics, on both the Standard Model measurements (SM) and new physics searches.

Before the Higgs boson discovery, I was focused on the precision measurement of the W boson mass, which was key in constraining the Higgs boson mass range. At the D0 experiment on the Tevatron at Fermilab, I made significant contributions to the high precision W boson mass measurement, which presents the most precise W mass result from a single experiment at the time.

After the Higgs boson discovery, the scattering of two massive vector bosons (VBS) offers a key avenue to probe the Electroweak Symmetry Breaking (EWSB) mechanism. I have contributed as key member in various ATLAS VBS analyses. We for the first time observed the VBS ZZ+2jets events at the LHC and the same sign WW+2jets at ATLAS, using the full Run-2 ATLAS data (~140 fb-1).

Searches for new physics beyond the SM can help address the questions that cannot be answered by the SM. I led the ATLAS searches for vector-like quarks (VLQs) in the lepton+jets decay channels using the ATLAS data at 8 TeV, concentrating on the pair production of bottom-quark-like VLQs (BB). It gave the contemporarily best result in the world.

Search for Lepton Flavor Violation (LFV) for charged leptons could provide profound insight to our understanding about nature. I have been a key member of searching for high mass LFV for various ATLAS publications, and leading the SJTU effort in this search. Currently I am leading an ATLAS analysis team as the contact person using the full Run-2 ATLAS data to search LFV. Great efforts were made in many key aspects, including reconstruction of heavy particles (Z’, RPV sneutrinos, quantum black holes), background modeling, etc.

I also led the SJTU team in playing a leading role in search for heavy resonances that decay into a vector boson and a Higgs boson. We made stringent constraints on the existent phase space of postulated heavy bosons W’ and Z’, or heavy CP-odd scalar boson A, which already exclude the heavy particles’ masses up to a few TeV.

In addition to physics analysis, I am heavily involved with detector work, i.e. Resistive Plate Chambers (RPC) R&D. I set up a new laboratory from scratch, dedicated to RPC R&D. I have been a key member in carrying on the ATLAS Phase-2 Upgrade for RPC, for which we have successfully constructed the bakelite RPC prototypes. We also optimized the RPC gas chamber design, which largely suppressed the dead zone while maintaining a high muon detection efficiency.

The Circular Electron Positron Collider (CEPC) is a proposed Higgs factory for extensive studies of the Higgs boson. I have been working on both its simulation study and detector R&D based on the RPC concept. A milestone paper was published on its physics potential on the Precision Higgs Physics measurements.

  1. 《Measurement of the W Boson Mass》, Phys. Rev. Lett. 103, 141801 (2009)

  2. 《Direct Measurement of the W Boson Width》, Phys. Rev. Lett. 103, 231802 (2009)

  3. A Novel Method for Modeling the Recoil in W Boson Events at Hadron Colliders》, Nucl. Instrum. & Meth. A 609, 250 (2009)

  4. 《Measurement of the W Boson Mass with the D0  detector》, Phys. Rev. D 89, 012005 (2014)

  5. 《Search for high-mass states with lepton plus missing transverse momentum in proton-proton collisions at ps = 7 TeV with the ATLAS detector》,Phys. Lett. B701 (2011) 50-69

  6. 《Search for excited leptons in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector》, Phys. Rev. D 85 (2012) 072003

  7. 《Search for vector-like B quarks in events with one isolated lepton, missing transverse momentum and jets at sqrt(s) = 8 TeV with the ATLAS detector》, Phys. Rev. D91, 112011 (2015)

  8. 《Search for production of vector-like quark pairs and of four top quarks in the lepton-plus-jets final state in pp collisions at √s = 8 TeV with the ATLAS detector》,10.1007/JHEP 08 (2015) 105

  9. 《Search for new phenomena in different-flavour high-mass dilepton final states in pp collisions at √s=13 TeV with the ATLAS detector》, Eur. Phys. J. C76 (2016) 541


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