Henry Newson Distinguished Professor of Physics
Professor of Physics
Professor of Physics at Duke Kunshan University (Secondary)
Prof. Gao's research focuses on understanding the structure of the nucleon in terms of quark and gluon degrees of freedom of Quantum Chromodynamics (QCD), search for QCD exotics, and fundamental symmetry studies at low energy to search for new physics beyond the Standard Model of electroweak interactions. Most recently, her group's studies of the structure of the nucleon have been focusing on a precision measurement of the proton (see her group's 2019 Nature paper on this topic) and deuteron charge radii to elucidate on the proton and the deuteron charge radius puzzles, and on imaging the three-dimensional structure of the nucleon in momentum space through the extraction of transverse momentum dependent parton distribution functions (TMDs), employing polarized semi-inclusive deep inelastic scattering processes. The nucleon tomography provided by TMDs will uncover the rich QCD dynamics, and provide quantitative information about the quark orbital angular momentum contribution to the proton spin. TMDs will also provide information on fundamental quantities such as the tensor charge of the nucleon, a quantity not only important for testing lattice QCD predictions, but also important for searches of new physics beyond the Standard Model together with the next generation of nucleon electric dipole moment experiments. Her group is playing leading roles in the Solenoidal Large Intensity Device (SoLID) project at Jefferson Lab, a high profile program which will make major impact on TMD physics, proton mass puzzle through precision measurement of J/psi production near threshold, and search for new physics beyond the Standard Model using parity-violating deep inelastic scattering. Most of her work utilizes the novel experimental technique of scattering polarized electrons or photons from polarized gas targets. Her group has built a number of state-of-the-art polarized gas targets including H/D internal gas target and a high-pressure polarized 3He target for photon experiments using the High Intensity Gamma Source (HIGS) facility at the Duke Free Electron Laser Laboratory (DFELL). Her research is being carried out mostly at the Thomas Jefferson National Accelerator Facility (JLab) in Newport News, Virginia, and the HIGS facility at DFELL.
Qiang, Y., et al. “Properties of the ∧(1520) resonance from high-precision electroproduction data.” Physics Letters, Section B: Nuclear, Elementary Particle and High Energy Physics, vol. 694, no. 2, Nov. 2010, pp. 123–28. Scopus, doi:10.1016/j.physletb.2010.09.052. Full Text
Qian, X., et al. “Experimental study of the A(e,e′π+) reaction on H1, H2, C12, Al27, Cu63, and Au197.” Physical Review C Nuclear Physics, vol. 81, no. 5, May 2010. Scopus, doi:10.1103/PhysRevC.81.055209. Full Text Open Access Copy
Ye, Q., et al. “A high-pressure polarized 3He gas target for nuclear-physics experiments using a polarized photon beam.” European Physical Journal A, vol. 44, no. 1, Apr. 2010, pp. 55–61. Scopus, doi:10.1140/epja/i2010-10932-0. Full Text
Gao, H. “Nucleon transversity study using a polarized 3He target in Hall A at JLab.” Nuclear Physics A, vol. 844, no. 1–4, Jan. 2010, pp. 202c-205c. Scopus, doi:10.1016/j.nuclphysa.2010.05.036. Full Text
Ye, Q., et al. “A High Pressure Polarized 3He Gas Target for the High Intensity Gamma Source Facility at the Duke Free Electron Laser Laboratory.” European Phys. Journal A, vol. 44, 2010.
al, H. Gao with X. Qian et. “Study of the A(e,e'pi^+) Reaction on 1H, 2H, 12C, 27Al, 63Cu and 197Au.” Phys. Rev. C, vol. 81, 2010.
Crawford, C., et al. “Role of mesons in the electromagnetic form factors of the nucleon.” Physical Review C Nuclear Physics, vol. 82, no. 4, Jan. 2010. Scopus, doi:10.1103/PhysRevC.82.045211. Full Text Open Access Copy
Seely, J., et al. “New measurements of the European Muon Collaboration effect in very light nuclei.” Physical Review Letters, vol. 103, no. 20, Nov. 2009, p. 202301. Epmc, doi:10.1103/physrevlett.103.202301. Full Text
Qian, X., et al. “The extraction of ϕ - N total cross section from d (γ, p K+ K-) n.” Physics Letters, Section B: Nuclear, Elementary Particle and High Energy Physics, vol. 680, no. 5, Oct. 2009, pp. 417–22. Scopus, doi:10.1016/j.physletb.2009.09.024. Full Text