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Jun Guo 

Title: Tenure-track Associate Professor

Email: jun.guo@sjtu.edu.cn; jun.guo@cern.ch
Phone: 86-21-54748990
Address: Room 630, #5 Science Building, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, China 
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Area of Physics: Experimental High Energy Physics; Collider Physics; Detector R&D 
 
Research Interests:
    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.
 
Biographical Sketch:
Tenure-track Associate Professor, Shanghai Jiao Tong University, Shanghai, China, Nov 2014 – present
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
 
 
Selected Publications:
  1. “Observation of electroweak production of a same-sign W boson pair in association with two jets in pp collisions at √s =13 TeV with the ATLAS detector”, ATLAS Collaboration, Phys. Rev. Lett. 123, 161801 (2019)
  2.  “Particle Identification Using Boosted Decision Trees in the Semi-Digital Hadronic Calorimeter Prototype”, CALICE Collaboration, JINST 15 P10009 (2019)
  3. “Search for the electroweak diboson production in association with a high-mass dijet system in semileptonic final states in pp collisions at √s =13 TeV with the ATLAS detector”, ATLAS Collaboration, Phys. Rev. D.100.032007 (2019)
  4. “Energy reconstruction for a hadronic calorimeter using multivariate data analysis methods”, Jun Guo et al., JINST 14 P10034 (2019)
  5.  “Precision Higgs physics at the CEPC”, CEPC Collaboration, Chinese Physics C(CPC) Vol. 43, No. 4, 043002 (2019)
  6. “Search for heavy resonances decaying into a W or Z boson and a Higgs boson in final states with leptons and b-jets in 36 fb-1 of √s = 13 TeV pp collisions with the ATLAS detector”, ATLAS Collaboration, JHEP 03, 174 (2018)
  7. “Search for lepton-flavor-violating decays of the Z boson into a tau lepton and a light lepton with the ATLAS detector”, ATLAS Collaboration, Phys. Rev. D 98, 092010 (2018)
  8.  “Search for lepton-flavor violation in different-flavor, high-mass final states in pp collisions at √s =13 TeV with the ATLAS detector”，ATLAS Collaboration, Phys. Rev. D 98, 092008 (2018)
  9.  “Search for new phenomena in different-flavour high-mass dilepton final states in pp collisions at √s=13 TeV with the ATLAS detector”, ATLAS Collaboration, Eur. Phys. J. C 76, 541 (2016)
  10.  “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”，ATLAS Collaboration, 10.1007/JHEP 08, 105 (2015)
  11.  “Search for vector-like B quarks in events with one isolated lepton, missing transverse momentum and jets at √s = 8 TeV with the ATLAS detector”, ATLAS Collaboration, Phys. Rev. D91, 112011 (2015)
  12. “Search for excited leptons in proton-proton collisions at √s = 7 TeV with the ATLAS detector”, ATLAS Collaboration, Phys. Rev. D 85, 072003 (2012)
  13. “Measurement of the W Boson Mass with the D0 detector”, D0 Collaboration, Phys. Rev. D 89, 012005 (2014)
  14.  “Search for high-mass states with lepton plus missing transverse momentum in proton-proton collisions at ps = 7 TeV with the ATLAS detector”，D0 Collaboration, Phys. Lett. B701, 50-69 (2011)
  15. “Direct Measurement of the W Boson Width”, D0 Collaboration, Phys. Rev. Lett. 103, 231802 (2009)
  16.  “Measurement of the W Boson Mass”, D0 Collaboration, Phys. Rev. Lett. 103, 141801 (2009)