Anselm G. Vossen

Anselm G. Vossen

Assistant Professor of Physics

Office Location: 
Physics Building Room 1885, Box 90305, Durham, NC 27007
Front Office Address: 
Physics Building Room 188, PO Box 90305, Durham, NC 27708
Office Hours: 
by appointment


In Quantum Chromodynamics (QCD), the theory of the strong interactions, the nucleon emerges as a strongly interacting, relativistic bound state of almost massless quarks and gluons.
Fifty years of experimental investigations into the nucleon's internal structure have provided remarkable insight into quark and gluon dynamics. However, many outstanding questions remain.
For example, the origin of the spin of the proton is still eludes us and many other properties of the nucleon cannot yet be derived from first order calculations. Even fundamental aspects like a quantitative understanding of the  origin of the mass of the nuclei (and thus most of the visible mass in the universe) as well as the confinement of quarks into hadrons remain outside our current understanding.

My research approaches these questions from two sides. At the newly upgraded Jefferson Lab facility, we use electron proton scattering data to map out the 3D dynamics of the nucleon. We are in particular interested in polarized probes that are sensitive to spin-orbit coupling in the proton wavefunction.
And at the newly constructed Belle II experiment, we use electron-positron annihilation data, to study how hadrons emergy from initial quarks. We are in particular interested how the quantum numbers of the inital quark, like spin, are expressed in the final state hadrons.

My group also works on precision tests of the flavor sector of the standard model at the intensity frontier. To this end we study the properties of B meson detected with the Belle II experiment.

Education & Training

  • D.R., Albert Ludwigs University of Freiburg (Germany) 2008

  • M.S., Albert Ludwigs University of Freiburg (Germany) 2004

Fellowships, Supported Research, & Other Grants

Research in High Energy Physics at Duke University awarded by US Department of Energy (2019 to 2020)

Adamczyk, L., et al. “Beam-Energy Dependence of Directed Flow of Λ, Λ[over ¯], K^{±}, K_{s}^{0}, and ϕ in Au+Au Collisions.Physical Review Letters, vol. 120, no. 6, Feb. 2018, p. 062301. Epmc, doi:10.1103/physrevlett.120.062301. Full Text

Shimizu, N., et al. “Measurement of the τ Michel parameters η and ξκ in the radiative leptonic decay τ - → l - ν τ ν l γ.” Progress of Theoretical and Experimental Physics, vol. 2018, no. 2, Feb. 2018. Scopus, doi:10.1093/ptep/pty003. Full Text

Hirose, S., et al. “Measurement of the τ lepton polarization and R(D*) in the decay B¯→D*τ−ν¯τ with one-prong hadronic τ decays at Belle.” Physical Review D, vol. 97, no. 1, Jan. 2018. Scopus, doi:10.1103/PhysRevD.97.012004. Full Text

Jia, S., et al. “Search for light tetraquark states in ϒ(1S) and ϒ(2S) decays.” Physical Review D, vol. 96, no. 11, Dec. 2017. Scopus, doi:10.1103/PhysRevD.96.112002. Full Text

Julius, T., et al. “Measurement of the branching fraction and CP asymmetry in B0 → π0π0 decays, and an improved constraint on ϕ2.” Physical Review D, vol. 96, no. 11, Dec. 2017. Scopus, doi:10.1103/PhysRevD.96.032007. Full Text

Grygier, J., et al. “Publisher’s Note: Search for B→hνν¯ decays with semileptonic tagging at Belle [Phys. Rev. D 96 , 091101(R) (2017)].” Physical Review D, vol. 96, no. 9, Nov. 2017. Scopus, doi:10.1103/PhysRevD.96.091101. Full Text

Adamczyk, L., et al. “Coherent diffractive photoproduction of ρ0 mesons on gold nuclei at 200 GeV/nucleon-pair at the Relativistic Heavy Ion Collider.” Physical Review C, vol. 96, no. 5, Nov. 2017. Scopus, doi:10.1103/PhysRevC.96.054904. Full Text

Horiguchi, T., et al. “Evidence for Isospin Violation and Measurement of CP Asymmetries in B→K^{*}(892)γ.Physical Review Letters, vol. 119, no. 19, Nov. 2017, p. 191802. Epmc, doi:10.1103/physrevlett.119.191802. Full Text

Dash, N., et al. “Search for CP Violation and Measurement of the Branching Fraction in the Decay D^{0}→K_{S}^{0}K_{S}^{0}.Physical Review Letters, vol. 119, no. 17, Oct. 2017, p. 171801. Epmc, doi:10.1103/physrevlett.119.171801. Full Text

Adamczyk, L., et al. “Bulk properties of the medium produced in relativistic heavy-ion collisions from the beam energy scan program.” Physical Review C, vol. 96, no. 4, Oct. 2017. Scopus, doi:10.1103/PhysRevC.96.044904. Full Text