During my previous career as a theoretical particle physicist, I worked in high-energy phenomenology, with particular interests in model building, effective field theories, supersymmetry, Higgs phenomenology, low-energy nuclear interactions, and dark matter.
With collaborators from Cornell and Korea Universities, we investigated a new class of composite Higgs models for naturalness that achieve lower scales for new physics by admitting a continuum of top and gauge partners; these are significant generalizations of well-studied unparticle models.
With collaborators from Technion, we used confining non-Abelian theories as models for dark matter to investigate a non-standard cosmological scenario with a second-stage annihilation of dark matter bound states. This permits heavier dark matter that can elude current direct and indirect detection bounds.
Separately, we investigated benchmark points and collider signatures for models of flavoured gauge mediation in SUSY. Using these models as motivation, we explored whether it is possible to discriminate the observable number of squarks at the LHC using charm tagging at ATLAS and CMS.
I was also involved in an effort to reanalyze the available elastic electron-proton scattering data as an attack on one corner of the proton radius puzzle (an accessible explanation of the puzzle is available here in a Scientific American blog post). This work also led to new parameterizations of the nucleon electromagnetic form factors, which will be useful for a wide variety of experimentalists in the nuclear, neutrino, and AMO physics communities. These are especially important for the US-DOE intensity frontier program that aims to measure neutrino sector parameters to percent-level precision.
At lower energies, I have also investigated searches for new physics in the polarization of heavy hadrons and in precision spectroscopy of atomic systems using effective field theory. The latter connects to earlier work with collaborators from Chicago in which we extended the Lagrangian in non-relativistic QED (NRQED) for a heavy particle interacting with the electromagnetic field.
I have been involved in a program of precision calculations of the mass of the Standard Model-like Higgs boson (discovered at the LHC in 2012) using effective field theory applied to certain scenarios of heavy supersymmetry. With these techniques, the exquisite measurement of the Higgs mass by ATLAS and CMS can be used to constrain the parameter space in the neutral, CP-even MSSM Higgs sector. MhEFT, a Mathematica package that resulted from this investigation, is available here.
During my undergraduate years, I was involved in the following projects:
- 2006: I worked on the commissioning of the TIGRESS gamma-ray detector on the ISAC beamline at TRIUMF.
- 2005: I designed and built electronics for resistivity measurements in a dilution refrigerator for the low-temperature laboratory run by Stephen Julian.
- 2004: I analyzed climatological data in relation to large-scale atmospheric patterns (NAO and SAM) with Paul Kushner.
Gabriel Lee 